ICSE Class 9 Biology — Chapter 8: Exam Readiness Practice

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Q1. What is a species?

Show Answer **Answer:** A group of organisms of a particular kind whose members can interbreed among themselves to produce fertile offspring.

Q2. State the key feature that defines a species.

Show Answer **Answer:** Ability to interbreed and produce fertile young ones.

Q3. Give the scientific name of the house cat.

Show Answer **Answer:** Felis domesticus

Q4. Give the scientific name of humans.

Show Answer **Answer:** Homo sapiens

Q5. Why do all house cats, though different in colour or size, belong to one species?

Show Answer **Answer:** Because they can all interbreed to produce fertile kittens.

Q6. Explain with an example how humans of different races still belong to the same species.

Show Answer **Answer:** Despite variations in features like skin colour or height, all humans can interbreed and produce fertile children. Thus all belong to Homo sapiens.

Q7. Name two plant species mentioned in this section.

Show Answer **Answer:** Mango tree and Peepal tree

Q8. Why is a mule sterile while horses and donkeys are fertile within themselves?

Show Answer **Answer:** Because a mule is the offspring of horse and donkey (two different species) with mismatched chromosomes, so it cannot produce fertile young ones.

Q9. Match: Horse × Donkey → ?

Show Answer **Answer:** Mule

Q10. Match: Zebra × Donkey → ?

Show Answer **Answer:** Zenkey

Q11. Match: Tiger × Lioness → ?

Show Answer **Answer:** Tigon

Q12. Match: Goat × Sheep → ?

Show Answer **Answer:** Geep

Q13. Match: Potato × Tomato → ?

Show Answer **Answer:** Pomato

Q14. Which of the following offspring is fertile: Mule, Zenkey, Pomato, or kittens of a house cat?

Show Answer **Answer:** Kittens of a house cat

Q15. Why are hybrids like Zenkey, Tigon, Geep and Pomato sterile?

Show Answer **Answer:** Because they are produced by crossing two different species with mismatched chromosomes.

Q16. Fill in the blank: Crossing a horse and a donkey produces a ___ which is ___.

Show Answer **Answer:** Mule, sterile

Q17. List one plant example where humans created a cross between two species.

Show Answer **Answer:** Pomato (potato × tomato), produces no seeds.

Q18. All breeds of a horse can interbreed among themselves. What does this show about ‘breed’ vs ‘species’?

Show Answer **Answer:** Breeds are variations within a species. Species is the larger group defined by interbreeding and fertile offspring.

Q19. A scientist claims he has produced a fertile hybrid between a goat and a sheep. What question should you ask to confirm if it is a new species?

Show Answer **Answer:** Whether the hybrid can itself reproduce fertile offspring in the next generation.

Q20. If two birds look very different in colour but produce fertile chicks together, should they be considered the same species? Why?

Show Answer **Answer:** Yes, because fertility of offspring is the true test of belonging to the same species, not appearance.

Q21. Why can humans of different races interbreed but a horse and a donkey cannot?

Show Answer **Answer:** Humans all share the same species with matching chromosomes, while horse and donkey are different species with mismatched chromosomes.

Q22. Twist: A lion and tiger can mate. Is their offspring fertile? What does this show?

Show Answer **Answer:** Their offspring (Tigon) is sterile, showing that even closely related species can cross, but sterility proves they are separate species.

Q23. Twist: Which of these crosses is a plant, not an animal: Mule, Pomato, Zenkey, Tigon?

Show Answer **Answer:** Pomato

Q24. Logical: Why does nature produce hybrids if they cannot survive as species?

Show Answer **Answer:** They show that species boundaries are not absolute walls, but fertility ensures that each species maintains its identity.

Q25. Challenge: Write one difference between ‘variation within a species’ and ‘hybrid between species’.

Show Answer **Answer:** Variation within a species still allows fertile offspring (e.g., human races, cat breeds). Hybrids between species produce sterile offspring (e.g., mule, tigon).

Q26. Why do we need a scientific system of naming organisms?

Show Answer **Answer:** Because common names differ from region to region and cause confusion. Scientific names are universal and unique.

Q27. Who developed the system of binomial nomenclature?

Show Answer **Answer:** Carolus Linnaeus

Q28. What is the meaning of ‘binomial’ in binomial nomenclature?

Show Answer **Answer:** It means 'two names' – each organism is given two parts to its name: genus and species.

Q29. In binomial nomenclature, what does the first word represent?

Show Answer **Answer:** Genus, written with a capital letter.

Q30. In binomial nomenclature, what does the second word represent?

Show Answer **Answer:** Species, written with a small letter.

Q31. Which language is used for scientific naming of organisms? Why?

Show Answer **Answer:** Latin, because it is a dead language and does not change with time.

Q32. How are scientific names written when typed and when handwritten?

Show Answer **Answer:** Typed: in italics. Handwritten: underlined separately for genus and species.

Q33. Give the scientific name of humans.

Show Answer **Answer:** Homo sapiens

Q34. Give the scientific name of mango.

Show Answer **Answer:** Mangifera indica

Q35. Give the scientific name of house cat.

Show Answer **Answer:** Felis domesticus

Q36. Which part of the name in ‘Homo sapiens’ is capitalised and which is not?

Show Answer **Answer:** Homo (genus) is capitalised; sapiens (species) is lowercase.

Q37. What is the advantage of using scientific names instead of local names?

Show Answer **Answer:** They are universal, avoid regional confusion, and clearly identify the species.

Q38. If two organisms have the same genus but different species, what does it mean?

Show Answer **Answer:** They are closely related but different species. Example: Panthera leo (lion) and Panthera tigris (tiger).

Q39. Fill in the blank: The scientific name of potato is __, and the scientific name of brinjal is __.

Show Answer **Answer:** Solanum tuberosum; Solanum melongena

Q40. Why is it incorrect to write ‘homo Sapiens’?

Show Answer **Answer:** Because the genus must be capitalised (Homo) and the species must be lowercase (sapiens).

Q41. Logical: Why does every organism need both genus and species name, not just one?

Show Answer **Answer:** Genus groups related organisms; species specifies the exact organism. Without both, names could be ambiguous.

Q42. Twist: If someone writes ‘Homo Sapiens’, how many mistakes are there?

Show Answer **Answer:** Two mistakes: Species should be lowercase; both words should be italicised or underlined.

Q43. Why are scientific names often difficult to pronounce?

Show Answer **Answer:** Because they are based on Latin, not modern spoken languages.

Q44. Give two advantages of using Latin in scientific names.

Show Answer **Answer:** Latin is universal and does not change over time.

Q45. Write one scientific name of a plant and one of an animal other than mango or human.

Show Answer **Answer:** Example: Zea mays (maize), Canis familiaris (dog).

Q46. Challenge: A student writes ‘mangifera Indica’. Point out the mistakes.

Show Answer **Answer:** 'Mangifera' must be capitalised, 'indica' must be lowercase, both must be italicised or underlined.

Q47. Why does binomial nomenclature help scientists communicate globally?

Show Answer **Answer:** Because it provides one accepted name for each organism, removing language barriers.

Q48. List the hierarchy of classification in correct order from lowest to highest.

Show Answer **Answer:** Species → Genus → Family → Order → Class → Phylum → Kingdom

Q49. Which is the basic unit of classification?

Show Answer **Answer:** Species

Q50. Which is the broadest category in classification?

Show Answer **Answer:** Kingdom

Q51. Fill in the blanks: Species → __ → Family → __ → Class → Phylum → Kingdom

Show Answer **Answer:** Genus; Order

Q52. Arrange the following in correct sequence: Family, Class, Kingdom, Species, Genus, Order, Phylum.

Show Answer **Answer:** Species → Genus → Family → Order → Class → Phylum → Kingdom

Q53. Which category groups organisms with maximum similarity?

Show Answer **Answer:** Species

Q54. Which category groups organisms with minimum similarity?

Show Answer **Answer:** Kingdom
Show Answer **Answer:** Same genus (closer).

Q56. Why is species considered the most precise category?

Show Answer **Answer:** Because individuals of a species can interbreed and produce fertile offspring, which is the finest biological filter.

Q57. Flashcard Drill: Recite the classification hierarchy backwards (Kingdom to Species).

Show Answer **Answer:** Kingdom → Phylum → Class → Order → Family → Genus → Species

Q58. Memory Aid: What is the mnemonic for the classification hierarchy?

Show Answer **Answer:** ‘King Philip Came Over For Good Soup’ (Kingdom, Phylum, Class, Order, Family, Genus, Species)

Q59. Hierarchy Visual: What is the structure of classification levels?

Show Answer **Answer:** See diagram → Kingdom → Phylum → Class → Order → Family → Genus → Species

Q60. Who proposed the Five Kingdom classification and in which year?

Show Answer **Answer:** R.H. Whittaker in 1969.

Q61. Name the five kingdoms in Whittaker’s classification.

Show Answer **Answer:** Monera, Protista, Fungi, Plantae, Animalia.

Q62. List the main criteria used by Whittaker for classification.

Show Answer **Answer:** Cell type, Cell structure, Body organisation, Mode of nutrition, Reproduction.

Q63. Which two kingdoms are prokaryotic and eukaryotic respectively?

Show Answer **Answer:** Monera is prokaryotic; the rest (Protista, Fungi, Plantae, Animalia) are eukaryotic.

Q64. Which kingdoms are unicellular?

Show Answer **Answer:** Monera (always), Protista (mostly).

Q65. Which kingdoms are multicellular?

Show Answer **Answer:** Fungi, Plantae, Animalia (Protista has some multicellular forms).

Q66. Which kingdoms are autotrophic?

Show Answer **Answer:** Plantae, some Protista, some Monera (cyanobacteria).

Q67. Which kingdoms are heterotrophic?

Show Answer **Answer:** Fungi, Animalia, some Protista, some Monera.

Q68. Why is nutrition a key criterion in Whittaker’s classification?

Show Answer **Answer:** Because organisms differ in how they obtain food: autotrophic (make own food) vs heterotrophic (depend on others).

Q69. Kingdom Monera: cell type and structure.

Show Answer **Answer:** Prokaryotic, unicellular, no true nucleus or membrane-bound organelles.

Q70. Kingdom Monera: nutrition types.

Show Answer **Answer:** Autotrophic (photosynthetic, chemosynthetic) or heterotrophic (saprophytic, parasitic).

Q71. Give 2 examples of Monera.

Show Answer **Answer:** Bacteria, Cyanobacteria (blue-green algae).

Q72. How do Monerans reproduce?

Show Answer **Answer:** By binary fission (asexual).

Q73. Why is cyanobacteria placed under Monera and not Plantae?

Show Answer **Answer:** Because it is prokaryotic, lacks a true nucleus despite being photosynthetic.

Q74. Kingdom Protista: cell type and organisation.

Show Answer **Answer:** Eukaryotic, mostly unicellular (some simple multicellular forms).

Q75. Kingdom Protista: examples.

Show Answer **Answer:** Amoeba, Paramecium, Euglena, Diatoms.

Q76. How do Protists move?

Show Answer **Answer:** With pseudopodia (Amoeba), cilia (Paramecium), flagella (Euglena).

Q77. How is Euglena special?

Show Answer **Answer:** It shows both autotrophic (photosynthetic) and heterotrophic (absorbs food) nutrition.
Show Answer **Answer:** Between Monera and multicellular kingdoms (Plantae, Fungi, Animalia).

Q79. Kingdom Fungi: cell type and organisation.

Show Answer **Answer:** Eukaryotic, mostly multicellular (except yeast), non-green.

Q80. Fungi: cell wall composition.

Show Answer **Answer:** Chitin.

Q81. Fungi: mode of nutrition.

Show Answer **Answer:** Heterotrophic, saprophytic (decomposers), parasitic, or symbiotic.

Q82. Give 3 examples of fungi.

Show Answer **Answer:** Mushroom, Yeast, Bread mould.

Q83. How do fungi reproduce?

Show Answer **Answer:** By spores (asexual) and sexual methods.

Q84. What role do fungi play in ecosystems?

Show Answer **Answer:** Decomposers – recycle nutrients from dead matter.

Q85. Kingdom Plantae: cell type and organisation.

Show Answer **Answer:** Eukaryotic, multicellular, with cellulose cell walls.

Q86. Plantae: mode of nutrition.

Show Answer **Answer:** Autotrophic (photosynthesis).

Q87. Subgroups of Plantae (simple to advanced).

Show Answer **Answer:** Thallophyta → Bryophyta → Pteridophyta → Gymnosperms → Angiosperms.

Q88. Thallophyta features and example.

Show Answer **Answer:** Simple, body not differentiated into root/stem/leaves. Example: Spirogyra.

Q89. Bryophyta features and example.

Show Answer **Answer:** Amphibians of plant kingdom, need water for reproduction. Example: Moss.

Q90. Pteridophyta features and example.

Show Answer **Answer:** First vascular plants, reproduce by spores. Example: Fern.

Q91. Gymnosperms features and example.

Show Answer **Answer:** Bear naked seeds, no fruit. Example: Pine, Cycas.

Q92. Angiosperms features and example.

Show Answer **Answer:** Flowering plants, seeds enclosed in fruits. Example: Mango, Mustard.

Q93. Kingdom Animalia: cell type and organisation.

Show Answer **Answer:** Eukaryotic, multicellular, no cell wall.

Q94. Animalia: mode of nutrition.

Show Answer **Answer:** Heterotrophic by ingestion.

Q95. Animalia: reproduction.

Show Answer **Answer:** Mostly sexual, with development stages.

Q96. Levels of organisation in Animalia.

Show Answer **Answer:** Cellular → Tissue → Organ → Organ system.

Q97. Examples of lower animals.

Show Answer **Answer:** Porifera (sponges), Coelenterata (Hydra), Platyhelminthes (flatworms).

Q98. Examples of higher animals.

Show Answer **Answer:** Chordates: Fish, Amphibians, Reptiles, Birds, Mammals.

Q99. Which kingdom shows the highest degree of complexity?

Show Answer **Answer:** Animalia.

Q100. Comparison Drill: Which two kingdoms are always unicellular?

Show Answer **Answer:** Monera, Protista.

Q101. Comparison Drill: Which two kingdoms have cell walls but differ in composition?

Show Answer **Answer:** Plantae (cellulose), Fungi (chitin).

Q102. Comparison Drill: Which kingdoms have autotrophic organisms?

Show Answer **Answer:** Plantae, Monera (cyanobacteria), some Protista, Euglena.

Q103. Which kingdom lacks cell wall completely?

Show Answer **Answer:** Animalia.

Q104. Why are viruses not included in the Five Kingdom classification?

Show Answer **Answer:** They are acellular, show life only inside a host, and do not fit into prokaryotic/eukaryotic categories.

Q105. What are lichens?

Show Answer **Answer:** Symbiotic association between algae (autotroph) and fungi (heterotroph).

Q106. Why are lichens considered indicators of air pollution?

Show Answer **Answer:** They are very sensitive to sulphur dioxide and die in polluted air.

Q107. Mnemonic to recall 5 kingdoms.

Show Answer **Answer:** ‘My Pretty Friendly Pet Ant’ → Monera, Protista, Fungi, Plantae, Animalia.

Q108. Flashcard Drill: Recite five kingdoms with one unique feature each.

Show Answer **Answer:** Monera (prokaryotic), Protista (unicellular eukaryotes), Fungi (chitin cell wall), Plantae (photosynthetic), Animalia (no cell wall).

Q109. Fill in the blanks: Fungi have __ in cell wall, Plantae have __ in cell wall.

Show Answer **Answer:** Chitin; Cellulose.

Q110. Logical: Why are Euglena and cyanobacteria tricky to classify?

Show Answer **Answer:** Euglena shows both plant/animal features; cyanobacteria are photosynthetic but prokaryotic.

Q111. Challenge: Place these organisms in correct kingdoms – Amoeba, Pine, Bacteria, Mushroom, Human.

Show Answer **Answer:** Protista – Amoeba; Plantae – Pine; Monera – Bacteria; Fungi – Mushroom; Animalia – Human.

Q112. Table Recall: Complete the following: Kingdom – Cell type – Organisation – Nutrition – Example.

Show Answer **Answer:** Monera – Prokaryotic – Unicellular – Auto/Heterotroph – Bacteria. Protista – Eukaryotic – Unicellular – Auto/Heterotroph – Amoeba. Fungi – Eukaryotic – Multicellular – Heterotroph – Mushroom. Plantae – Eukaryotic – Multicellular – Autotroph – Mango. Animalia – Eukaryotic – Multicellular – Heterotroph – Human.

Q113. What system is used for naming organisms scientifically?

Show Answer **Answer:** Binomial nomenclature.

Q114. Who introduced binomial nomenclature?

Show Answer **Answer:** Carolus Linnaeus.

Q115. What does ‘binomial’ mean in binomial nomenclature?

Show Answer **Answer:** It means 'two names' – each organism is given a genus name and a species name.

Q116. Which language is used in scientific naming of organisms?

Show Answer **Answer:** Latin.

Q117. Why is Latin used for naming organisms?

Show Answer **Answer:** Because Latin is a dead language and does not change with time.

Q118. In scientific names, what does the first word represent?

Show Answer **Answer:** The Genus (always capitalised).

Q119. In scientific names, what does the second word represent?

Show Answer **Answer:** The Species (written in lowercase).

Q120. How are scientific names printed in books?

Show Answer **Answer:** They are italicised.

Q121. How are scientific names written in handwriting?

Show Answer **Answer:** They are underlined separately for genus and species.

Q122. Correct this: homo sapiens

Show Answer **Answer:** Homo sapiens (Homo with capital H, sapiens lowercase, italicised/underlined).

Q123. Correct this: mangifera Indica

Show Answer **Answer:** Mangifera indica (Mangifera capitalised, indica lowercase).

Q124. Why should both genus and species be written in a name?

Show Answer **Answer:** Because genus alone is too broad, and species specifies the exact organism.

Q125. Give the scientific name of Mango.

Show Answer **Answer:** Mangifera indica.

Q126. Give the scientific name of Human.

Show Answer **Answer:** Homo sapiens.

Q127. Give the scientific name of House cat.

Show Answer **Answer:** Felis domesticus.

Q128. Write the correct way to handwrite the scientific name of a cat.

Show Answer **Answer:** Underline separately: _Felis_ _domesticus_.

Q129. Which part of a scientific name tells you about the organism’s close relatives?

Show Answer **Answer:** The genus.

Q130. Which part of a scientific name is unique to the organism?

Show Answer **Answer:** The species.

Q131. Why is binomial nomenclature useful worldwide?

Show Answer **Answer:** It gives each organism one universal name, avoids regional confusion, and makes scientific communication easy.

Q132. Example Drill: Write the scientific names for Dog and Maize.

Show Answer **Answer:** Dog – Canis familiaris; Maize – Zea mays.

Q133. Fill in the blank: Potato is __ __, and Brinjal is __ ___.

Show Answer **Answer:** Solanum tuberosum; Solanum melongena.

Q134. Logical: Why is it wrong to call a mango just ‘Mangifera’?

Show Answer **Answer:** Because 'Mangifera' is a genus with many species. Without 'indica' the name is incomplete.

Q135. Why is it incorrect to write Homo Sapiens?

Show Answer **Answer:** Because the species name 'sapiens' must not be capitalised.

Q136. Twist: Which of these names is correct? a) Felis Domesticus b) Felis domesticus c) felis domesticus

Show Answer **Answer:** b) Felis domesticus.

Q137. Twist: Which of these names is correct? a) Mangifera Indica b) Mangifera indica c) mangifera indica

Show Answer **Answer:** b) Mangifera indica.

Q138. Challenge: Why does binomial nomenclature prevent duplication of names across the world?

Show Answer **Answer:** Because the same organism cannot have more than one valid Latin name, ensuring uniqueness.

Q139. Reflection: Why do you think scientists chose Latin instead of English or Hindi for naming organisms?

Show Answer **Answer:** Because Latin was historically the language of science, is not used for daily communication, and remains unchanged over centuries.

Q140. Name the two broad divisions of Animal Kingdom.

Show Answer **Answer:** Non-chordates (invertebrates) and Chordates (vertebrates).

Q141. What is the main difference between chordates and non-chordates?

Show Answer **Answer:** Chordates have a notochord/vertebral column; non-chordates do not.

Q142. Give the sequence of non-chordate phyla from simplest to complex.

Show Answer **Answer:** Porifera → Coelenterata → Platyhelminthes → Nematoda → Annelida → Arthropoda → Mollusca → Echinodermata.

Q143. Mnemonic for non-chordate sequence.

Show Answer **Answer:** ‘Poor Children Play Near A Market Every Monday’ → Porifera, Coelenterata, Platyhelminthes, Nematoda, Annelida, Mollusca, Echinodermata.

Q144. Porifera: key features.

Show Answer **Answer:** • Simplest animals • Pores in body • No true tissues/organs • Sessile (fixed) • Examples: Sponges.

Q145. Why are sponges classified as animals and not plants?

Show Answer **Answer:** Because they do not make their own food, are heterotrophic, and have cellular organisation.

Q146. Coelenterata: key features.

Show Answer **Answer:** • Body with cavity • Radial symmetry • Stinging cells (cnidoblasts) • Examples: Hydra, Jellyfish, Sea anemone.

Q147. Platyhelminthes: key features.

Show Answer **Answer:** • Flatworms • Bilateral symmetry • Triploblastic • Mostly parasitic • Examples: Tapeworm, Liver fluke.

Q148. Nematoda: key features.

Show Answer **Answer:** • Roundworms • Bilateral symmetry • Unsegmented • Body cavity (pseudocoelom) • Example: Ascaris.

Q149. Annelida: key features.

Show Answer **Answer:** • Segmented worms • True coelom • Closed blood system • Examples: Earthworm, Leech.

Q150. Arthropoda: key features.

Show Answer **Answer:** • Jointed legs • Segmented body • Chitinous exoskeleton • Open circulation • Examples: Insects, Crab, Spider.

Q151. Why are arthropods the most successful animals?

Show Answer **Answer:** Because of their tough exoskeleton, segmentation, and adaptability (largest phylum).

Q152. Mollusca: key features.

Show Answer **Answer:** • Soft body • May have shell • Muscular foot • Body cavity present • Examples: Snail, Octopus.

Q153. Echinodermata: key features.

Show Answer **Answer:** • Spiny skin • Radial symmetry (adult) • Water vascular system • Marine • Examples: Starfish, Sea urchin.

Q154. Chordates: key features.

Show Answer **Answer:** • Notochord present (at least in embryonic stage) • Dorsal nerve cord • Examples: Fish, Amphibians, Reptiles, Birds, Mammals.

Q155. Pisces: features.

Show Answer **Answer:** • Aquatic • Gills for respiration • Scales • Fins for locomotion • Examples: Shark, Rohu.

Q156. Amphibia: features.

Show Answer **Answer:** • Live on land and water • Moist skin • Respire by gills (larva) and lungs (adult) • Lay eggs in water • Examples: Frog, Salamander.

Q157. Reptilia: features.

Show Answer **Answer:** • Dry scaly skin • Breathe by lungs • Cold-blooded • Lay eggs on land • Examples: Lizard, Crocodile, Snake.

Q158. Aves (Birds): features.

Show Answer **Answer:** • Feathers • Forelimbs as wings • Hollow bones • Warm-blooded • Lay eggs • Examples: Sparrow, Crow, Eagle.

Q159. Mammalia: features.

Show Answer **Answer:** • Hair on body • Mammary glands • Warm-blooded • Give birth to young (mostly) • Examples: Human, Dog, Whale, Bat.

Q160. Why is a whale classified as a mammal and not a fish?

Show Answer **Answer:** Because it has lungs, gives birth to young ones, and feeds them with milk.

Q161. Why is a bat classified as a mammal and not a bird?

Show Answer **Answer:** Because it has hair and mammary glands, and gives birth to young, even though it can fly.

Q162. Comparison: Amphibians vs Reptiles.

Show Answer **Answer:** Amphibians: moist skin, need water to breed. Reptiles: dry scaly skin, lay eggs on land.

Q163. Comparison: Birds vs Mammals.

Show Answer **Answer:** Birds: lay eggs, feathers, hollow bones. Mammals: give birth (mostly), hair, mammary glands.

Q164. Which animal phylum is called the ‘backbone of ecosystem recycling’?

Show Answer **Answer:** Annelida (earthworm as soil recycler).

Q165. Which phylum includes humans?

Show Answer **Answer:** Chordata, Class Mammalia.

Q166. Logical: Why are Echinoderms considered advanced despite radial symmetry?

Show Answer **Answer:** Because they are deuterostomes, developmentally closer to chordates.

Q167. Fill in the blanks: Starfish belongs to Phylum __; Earthworm belongs to Phylum __.

Show Answer **Answer:** Echinodermata; Annelida.

Q168. Flashcard Drill: Recite all non-chordate phyla with one example each.

Show Answer **Answer:** Porifera – Sponge; Coelenterata – Hydra; Platyhelminthes – Tapeworm; Nematoda – Ascaris; Annelida – Earthworm; Arthropoda – Insect; Mollusca – Snail; Echinodermata – Starfish.

Q169. Flashcard Drill: Recite chordate classes with one example each.

Show Answer **Answer:** Pisces – Shark; Amphibia – Frog; Reptilia – Snake; Aves – Crow; Mammalia – Human.

Q170. Which phylum has organisms with jointed legs and chitinous exoskeleton?

Show Answer **Answer:** Arthropoda.

Q171. Which phylum has organisms with water vascular system?

Show Answer **Answer:** Echinodermata.

Q172. Twist: Why is Hydra included in Coelenterata and not in Annelida?

Show Answer **Answer:** Because Hydra has radial symmetry, body cavity but no segmentation, whereas annelids are segmented worms.

Q173. Trick: Which phylum is the most advanced among invertebrates?

Show Answer **Answer:** Echinodermata.

Q174. Trick: Which class of chordates shows both aquatic and terrestrial life?

Show Answer **Answer:** Amphibia.

Q175. Challenge: Arrange in increasing complexity – Amoeba, Earthworm, Fish, Frog, Dog.

Show Answer **Answer:** Amoeba → Earthworm → Fish → Frog → Dog.

Q176. Mnemonic for 5 classes of chordates.

Show Answer **Answer:** ‘Please Allow Real Birds More’ → Pisces, Amphibia, Reptilia, Birds, Mammals.

Q177. Memory Drill: Which groups are cold-blooded? Which are warm-blooded?

Show Answer **Answer:** Cold-blooded: Pisces, Amphibia, Reptilia. Warm-blooded: Aves, Mammals.

Q178. Which phylum is also called spiny-skinned animals?

Show Answer **Answer:** Echinodermata.

Q179. What type of symmetry do sponges (Porifera) show?

Show Answer **Answer:** Asymmetry (no definite symmetry).

Q180. What type of symmetry do Coelenterates show?

Show Answer **Answer:** Radial symmetry.

Q181. What type of symmetry do Platyhelminthes, Nematoda, and Annelida show?

Show Answer **Answer:** Bilateral symmetry.

Q182. Which phylum has a pseudocoelom?

Show Answer **Answer:** Nematoda.

Q183. Which phylum has a true coelom and segmentation?

Show Answer **Answer:** Annelida.

Q184. Which phylum has organisms with an open circulatory system and jointed appendages?

Show Answer **Answer:** Arthropoda.

Q185. Give one aquatic example of Arthropoda.

Show Answer **Answer:** Crab or Prawn.

Q186. Give one terrestrial example of Arthropoda.

Show Answer **Answer:** Spider, Ant, Cockroach.

Q187. Which is the largest phylum in Animal Kingdom?

Show Answer **Answer:** Arthropoda.

Q188. What is the locomotory organ in Molluscs?

Show Answer **Answer:** Muscular foot.

Q189. Name a highly advanced Mollusc with a developed brain.

Show Answer **Answer:** Octopus.

Q190. Which phylum has tube feet for locomotion?

Show Answer **Answer:** Echinodermata.

Q191. Which animals show alternation of generations (polyp and medusa)?

Show Answer **Answer:** Coelenterates (Hydra, Jellyfish).

Q192. What is the level of organisation in sponges (Porifera)?

Show Answer **Answer:** Cellular level.

Q193. What is the level of organisation in Coelenterates and Platyhelminthes?

Show Answer **Answer:** Tissue level.

Q194. What is the level of organisation in Annelida onwards?

Show Answer **Answer:** Organ system level.

Q195. Which classes of Chordates are oviparous (egg-laying)?

Show Answer **Answer:** Pisces, Amphibia, Reptilia, Aves (most).

Q196. Which chordate class is mostly viviparous (give birth to young)?

Show Answer **Answer:** Mammalia.

Q197. Which two classes of chordates are warm-blooded?

Show Answer **Answer:** Aves and Mammalia.

Q198. Which three classes of chordates are cold-blooded?

Show Answer **Answer:** Pisces, Amphibia, Reptilia.

Q199. Logical: Why do amphibians still depend on water for survival?

Show Answer **Answer:** Because they lay eggs in water and their larval stage has gills for respiration.

Q200. Logical: Why are reptiles considered the first true land vertebrates?

Show Answer **Answer:** Because they have dry scaly skin, lungs, and lay eggs on land without drying out.

Q201. Challenge: Match phylum/class with examples – Porifera, Mollusca, Amphibia, Reptilia, Mammalia.

Show Answer **Answer:** Porifera – Sponge; Mollusca – Snail; Amphibia – Frog; Reptilia – Snake; Mammalia – Dog.

Q202. Challenge: Which of these are not invertebrates – Earthworm, Starfish, Dog, Crab?

Show Answer **Answer:** Dog (Chordate, Mammal).

Q203. Trick: Why is a starfish not a fish?

Show Answer **Answer:** Because it is an echinoderm (marine invertebrate), not a chordate.

Q204. Trick: Why is silverfish not a fish?

Show Answer **Answer:** Because it is an insect (Arthropoda).

Q205. Memory Drill: List five differences between Mammals and Birds.

Show Answer **Answer:** Mammals – hair, mammary glands, give birth, diaphragm, external ears. Birds – feathers, wings, lay eggs, hollow bones, no external ears.

Q206. Flashcard Drill: Recite all animal groups with one keyword each.

Show Answer **Answer:** Porifera – pores; Coelenterata – stinging cells; Platyhelminthes – flatworms; Nematoda – roundworms; Annelida – segmented worms; Arthropoda – jointed legs; Mollusca – soft body; Echinodermata – spiny skin; Pisces – fish; Amphibia – land/water; Reptilia – scaly; Aves – feathers; Mammalia – milk.

Q207. What are the four levels of organisation in animals?

Show Answer **Answer:** Cellular, Tissue, Organ, Organ system.

Q208. Give one example of an animal with only cellular level of organisation.

Show Answer **Answer:** Porifera (sponges).

Q209. Give one example of an animal with tissue level of organisation.

Show Answer **Answer:** Coelenterata (Hydra, Jellyfish).

Q210. Give one example of an animal with organ level of organisation.

Show Answer **Answer:** Platyhelminthes (flatworms).

Q211. Give one example of an animal with organ system level of organisation.

Show Answer **Answer:** Earthworm, Humans, Fish.

Q212. What are the three types of symmetry in animals?

Show Answer **Answer:** Asymmetry, Radial symmetry, Bilateral symmetry.

Q213. Define asymmetry with an example.

Show Answer **Answer:** No definite body plan; e.g., Sponges.

Q214. Define radial symmetry with an example.

Show Answer **Answer:** Body can be divided into equal halves by many planes through the central axis; e.g., Hydra, Starfish.

Q215. Define bilateral symmetry with an example.

Show Answer **Answer:** Body can be divided into two equal halves only through one plane; e.g., Human, Earthworm.

Q216. Which type of symmetry is most advanced and why?

Show Answer **Answer:** Bilateral symmetry – allows streamlined body, cephalisation, efficient movement.

Q217. What is a body cavity?

Show Answer **Answer:** A fluid-filled space between body wall and gut, also called coelom.

Q218. Define acoelomate with example.

Show Answer **Answer:** Animals without a body cavity; e.g., Flatworms (Platyhelminthes).

Q219. Define pseudocoelomate with example.

Show Answer **Answer:** Animals with false body cavity; e.g., Roundworms (Nematoda).

Q220. Define coelomate with example.

Show Answer **Answer:** Animals with true body cavity lined by mesoderm; e.g., Annelids, Humans.

Q221. Why is coelom important in evolution?

Show Answer **Answer:** It allows development of complex organs and organ systems.

Q222. What is segmentation in animals?

Show Answer **Answer:** Repetition of body parts in segments along the body axis.

Q223. Give two examples of segmented animals.

Show Answer **Answer:** Earthworm (Annelida), Cockroach (Arthropoda).

Q224. Which phylum first shows true segmentation?

Show Answer **Answer:** Annelida.

Q225. Logical: Why is segmentation considered an evolutionary advantage?

Show Answer **Answer:** Because it allows specialisation of body parts and efficient movement.

Q226. Which animals show radial symmetry only in adult stage but bilateral in larva?

Show Answer **Answer:** Echinoderms (Starfish).

Q227. Which is the simplest animal group with bilateral symmetry?

Show Answer **Answer:** Platyhelminthes (flatworms).

Q228. Twist: Why are sponges (Porifera) considered animals despite no tissues or symmetry?

Show Answer **Answer:** Because they are multicellular, heterotrophic, and lack chlorophyll.

Q229. Flashcard Drill: Recite all types of coelom with one example each.

Show Answer **Answer:** Acoelomate – Flatworm; Pseudocoelomate – Roundworm; Coelomate – Earthworm/Human.

Q230. Flashcard Drill: Recite levels of organisation with phylum examples.

Show Answer **Answer:** Cellular – Porifera; Tissue – Coelenterata; Organ – Platyhelminthes; Organ system – Annelida to Chordates.

Q231. Phylum Porifera: Key features.

Show Answer **Answer:** • Asymmetrical • Cellular level of organisation • Pores all over body • Sessile • Skeleton of spicules/spongin • Example: Sponges.

Q232. What is the skeleton of sponges made of?

Show Answer **Answer:** Spicules or spongin fibres.

Q233. How do sponges reproduce?

Show Answer **Answer:** By fragmentation (asexual) and sexual reproduction.

Q234. Phylum Coelenterata: Key features.

Show Answer **Answer:** • Tissue level of organisation • Radial symmetry • Cnidoblasts (stinging cells) • Body forms: polyp and medusa • Examples: Hydra, Jellyfish.

Q235. What are cnidoblasts?

Show Answer **Answer:** Special stinging cells in coelenterates used for defense and capturing prey.

Q236. Give two body forms of Coelenterates.

Show Answer **Answer:** Polyp (sessile, e.g. Hydra), Medusa (free swimming, e.g. Jellyfish).

Q237. Phylum Platyhelminthes: Key features.

Show Answer **Answer:** • Flat, bilaterally symmetrical • Triploblastic • Acoelomate • Parasitic forms common • Examples: Tapeworm, Liver fluke.

Q238. What type of body cavity do Platyhelminthes have?

Show Answer **Answer:** They are acoelomates (no body cavity).

Q239. Name two parasitic flatworms.

Show Answer **Answer:** Tapeworm and Liver fluke.

Q240. Phylum Nematoda: Key features.

Show Answer **Answer:** • Round, elongated worms • Bilateral symmetry • Pseudocoelom • Unsegmented • Parasitic or free-living • Example: Ascaris (roundworm).

Q241. What is the body cavity of nematodes called?

Show Answer **Answer:** Pseudocoelom.

Q242. Give one disease caused by nematodes in humans.

Show Answer **Answer:** Ascariasis (caused by Ascaris).

Q243. Phylum Annelida: Key features.

Show Answer **Answer:** • Segmented body (metamerism) • True coelom • Organ system level • Closed circulatory system • Examples: Earthworm, Leech.

Q244. What is metamerism?

Show Answer **Answer:** Repetition of body segments in annelids.

Q245. Give two examples of annelids.

Show Answer **Answer:** Earthworm and Leech.

Q246. Why are annelids called first true coelomates?

Show Answer **Answer:** Because they have a body cavity (coelom) lined by mesoderm and segmentation.

Q247. Phylum Arthropoda: Key features.

Show Answer **Answer:** • Jointed appendages • Segmented body (head, thorax, abdomen) • Chitinous exoskeleton • Open circulatory system • Examples: Insects, Crab, Spider.

Q248. Which is the largest phylum in Animal Kingdom?

Show Answer **Answer:** Arthropoda.

Q249. Give three examples of arthropods.

Show Answer **Answer:** Insects, Crab, Spider.

Q250. What type of circulatory system do arthropods have?

Show Answer **Answer:** Open circulatory system.

Q251. Phylum Mollusca: Key features.

Show Answer **Answer:** • Soft body, may have shell • Muscular foot for movement • True coelom • Examples: Snail, Octopus, Mussel.

Q252. Which mollusc is highly intelligent?

Show Answer **Answer:** Octopus.

Q253. What is the locomotory organ in molluscs?

Show Answer **Answer:** Muscular foot.

Q254. Phylum Echinodermata: Key features.

Show Answer **Answer:** • Spiny skin • Marine • Radial symmetry (adult) • Water vascular system • Examples: Starfish, Sea urchin.

Q255. What is the water vascular system used for in echinoderms?

Show Answer **Answer:** Locomotion, respiration, and capturing food.

Q256. Give two examples of echinoderms.

Show Answer **Answer:** Starfish, Sea urchin.

Q257. Logical: Why are echinoderms considered closer to chordates?

Show Answer **Answer:** Because they are deuterostomes, developmentally similar to chordates.

Q258. Twist: Why is a starfish not a fish?

Show Answer **Answer:** Because it belongs to Phylum Echinodermata, not Chordata.

Q259. Comparison Drill: Match phylum with example – Porifera, Coelenterata, Platyhelminthes, Nematoda, Annelida, Arthropoda, Mollusca, Echinodermata.

Show Answer **Answer:** Porifera – Sponge; Coelenterata – Hydra; Platyhelminthes – Tapeworm; Nematoda – Ascaris; Annelida – Earthworm; Arthropoda – Crab; Mollusca – Snail; Echinodermata – Starfish.

Q260. Flashcard Drill: Recite non-chordate phyla in order with one feature each.

Show Answer **Answer:** Porifera – pores; Coelenterata – stinging cells; Platyhelminthes – flatworms; Nematoda – roundworms; Annelida – segmentation; Arthropoda – jointed legs; Mollusca – soft body; Echinodermata – spiny skin.

Q261. What are the key features of Phylum Chordata?

Show Answer **Answer:** • Notochord present (at least in embryonic stage) • Dorsal nerve cord • Paired gill slits (in some stage) • Post-anal tail (in some stage).

Q262. What are the five main classes of vertebrates under chordates?

Show Answer **Answer:** Pisces, Amphibia, Reptilia, Aves, Mammalia.

Q263. Class Pisces: Key features.

Show Answer **Answer:** • Aquatic • Gills for respiration • Fins for locomotion • Scales on body • Cold-blooded • Examples: Shark, Rohu.

Q264. Give two examples of cartilaginous and bony fishes.

Show Answer **Answer:** Cartilaginous: Shark, Ray; Bony: Rohu, Catla.

Q265. Amphibia: Key features.

Show Answer **Answer:** • Live both on land and in water • Moist skin • Respire by gills (larva) and lungs + skin (adult) • Cold-blooded • Lay eggs in water • Examples: Frog, Salamander.

Q266. Why are amphibians called the first land vertebrates?

Show Answer **Answer:** Because they can live both in water and on land, though they still need water to breed.

Q267. Reptilia: Key features.

Show Answer **Answer:** • Dry scaly skin • Cold-blooded • Respire by lungs • Lay eggs on land with protective covering • Examples: Lizard, Crocodile, Snake.

Q268. How are reptiles better adapted to land than amphibians?

Show Answer **Answer:** They have dry scaly skin that prevents water loss and lay eggs on land.

Q269. Aves (Birds): Key features.

Show Answer **Answer:** • Feathers • Forelimbs modified as wings • Hollow bones • Warm-blooded • Lay eggs • Examples: Crow, Sparrow, Eagle.

Q270. What adaptations help birds fly?

Show Answer **Answer:** Feathers, wings, hollow bones, streamlined body.

Q271. Mammalia: Key features.

Show Answer **Answer:** • Hair on body • Mammary glands to feed young • Warm-blooded • Mostly viviparous (give birth) • Examples: Human, Dog, Whale, Bat.

Q272. Why is a whale classified as a mammal and not a fish?

Show Answer **Answer:** Because it has lungs, is warm-blooded, gives birth to young, and produces milk.

Q273. Why is a bat classified as a mammal and not a bird?

Show Answer **Answer:** Because it has hair, mammary glands, and gives birth to young.

Q274. Which two classes of chordates are warm-blooded?

Show Answer **Answer:** Aves and Mammalia.

Q275. Which three classes of chordates are cold-blooded?

Show Answer **Answer:** Pisces, Amphibia, Reptilia.

Q276. Give two examples of amphibians.

Show Answer **Answer:** Frog, Salamander.

Q277. Give two examples of reptiles.

Show Answer **Answer:** Snake, Crocodile.

Q278. Give two examples of mammals that live in water.

Show Answer **Answer:** Whale, Dolphin.

Q279. Give two examples of flying mammals.

Show Answer **Answer:** Bat, Flying squirrel.

Q280. Comparison: Amphibians vs Reptiles.

Show Answer **Answer:** Amphibians – moist skin, eggs in water. Reptiles – dry scaly skin, eggs on land.

Q281. Comparison: Birds vs Mammals.

Show Answer **Answer:** Birds – feathers, wings, lay eggs. Mammals – hair, mammary glands, give birth (mostly).

Q282. Comparison: Pisces vs Amphibia.

Show Answer **Answer:** Pisces – only aquatic, gills, fins. Amphibia – aquatic + terrestrial, gills as larva, lungs as adult.

Q283. Comparison: Reptiles vs Birds.

Show Answer **Answer:** Reptiles – cold-blooded, scaly, eggs with leathery covering. Birds – warm-blooded, feathers, hard-shelled eggs.

Q284. Which chordate class has hollow bones?

Show Answer **Answer:** Aves (Birds).

Q285. Which chordate class has mammary glands?

Show Answer **Answer:** Mammalia.

Q286. Logical: Why are reptiles considered the first true land vertebrates?

Show Answer **Answer:** Because they lay eggs on land and have protective scaly skin preventing water loss.

Q287. Logical: Why do amphibians still depend on water despite being able to live on land?

Show Answer **Answer:** Because they lay eggs in water and larvae breathe through gills.

Q288. Trick: Why is silverfish not a fish?

Show Answer **Answer:** Because it is an insect (Arthropoda).

Q289. Trick: Why is starfish not a fish?

Show Answer **Answer:** Because it is an echinoderm (non-chordate).

Q290. Challenge: Arrange in order of complexity – Fish, Frog, Lizard, Crow, Dog.

Show Answer **Answer:** Fish → Frog → Lizard → Crow → Dog.

Q291. Flashcard Drill: Recite all chordate classes with one example each.

Show Answer **Answer:** Pisces – Shark; Amphibia – Frog; Reptilia – Snake; Aves – Crow; Mammalia – Human.

Q292. Memory Drill: Warm-blooded vs Cold-blooded animals.

Show Answer **Answer:** Warm-blooded – Birds, Mammals. Cold-blooded – Fishes, Amphibians, Reptiles.

Q293. Reflection: Which adaptation in reptiles marked the evolutionary shift to complete land life?

Show Answer **Answer:** Dry scaly skin and shelled eggs laid on land.

Q294. Why are viruses not included in Whittaker’s Five Kingdoms?

Show Answer **Answer:** Because they are acellular, lack cellular structure, and show living traits only inside a host.

Q295. What is the basic structure of a virus?

Show Answer **Answer:** A protein coat (capsid) surrounding nucleic acid (DNA or RNA).

Q296. Which type of virus has DNA as genetic material?

Show Answer **Answer:** DNA viruses (e.g., Bacteriophage).

Q297. Which type of virus has RNA as genetic material?

Show Answer **Answer:** RNA viruses (e.g., HIV, Influenza).

Q298. Why are viruses considered non-living outside the host?

Show Answer **Answer:** Because they cannot reproduce or carry out metabolism outside a host cell.

Q299. Why are viruses considered living inside a host?

Show Answer **Answer:** Because they can reproduce and control the host machinery to multiply.
Show Answer **Answer:** Because they behave like non-living particles outside host, but show living properties inside host.

Q301. Give two examples of viruses that infect humans.

Show Answer **Answer:** HIV (causes AIDS), Influenza virus (causes flu).

Q302. Give an example of a virus that infects bacteria.

Show Answer **Answer:** Bacteriophage.

Q303. Logical: Why are antibiotics not effective against viruses?

Show Answer **Answer:** Because viruses do not have cellular structures like cell wall or ribosomes on which antibiotics act.

Q304. Challenge: How do vaccines protect against viruses?

Show Answer **Answer:** By stimulating the immune system to produce memory cells and antibodies before actual infection.

Q305. Reflection: Do you think viruses are truly alive? Why or why not?

Show Answer **Answer:** (Open-ended) – Because they blur the line: they show life only inside host but are inert outside.