6.4 Some Experiments on Germination

(Narrator’s voice, lively, like in a science show demonstration)

“Science does not only describe — it demonstrates. Let us now perform simple experiments that prove, one by one, the conditions needed for germination.”

1. Water is Necessary

Take two beakers, A and B.

  • In A: place some green gram seeds on wet cotton wool.
  • In B: place similar seeds on dry cotton wool.

Keep both in the same room.

  • Result: Seeds in beaker A germinate.
  • Seeds in B do not.

(Narrator’s aside)
“The message is simple: without water, the seed cannot swell, the coat cannot rupture, and the enzymes cannot act. Life waits, but does not begin.”

2. Suitable Temperature is Necessary

Again, two beakers, A and B, with green gram seeds on wet cotton wool.

  • Beaker A: kept in an ordinary room.

  • Beaker B: kept in a refrigerator.

  • Result: Seeds in A germinate normally.
  • Seeds in B do not germinate quickly. At best, they sprout after several days, weakly.

(Narrator’s reflection)
“Temperature is the rhythm of life. Too cold, and growth slows to stillness. Moderately warm — 25°C to 35°C — and the embryo awakens. Seeds of the tropics demand even more heat than those of temperate lands.”

3. Oxygen is Necessary (Fig. 6.3)

Take two conical flasks, A and B. Line them with wet cotton wool and place soaked gram seeds on it.

  • In flask B: suspend a small test-tube containing alkaline pyrogallol solution (which absorbs oxygen), without spilling a drop. Seal with a cork.

  • In flask A: suspend a similar test-tube, but filled with plain water.

  • Result:
    • Seeds in flask A germinate — oxygen available.
    • Seeds in flask B do not germinate — oxygen removed. At most, slight sprouting occurs due to anaerobic respiration.

[Image/Diagram: Fig. 6.3 Seeds require air (oxygen) for germination.
A — Seeds germinate in ordinary air,
B — Seeds do not germinate without oxygen]

(Narrator’s tone, crisp)
“Oxygen is the invisible fuel. Without it, the embryo cannot release energy from food.”

4. The Three-Bean Experiment (Fig. 6.4)

Take three mature, air-dried bean seeds. Tie them on a glass slide at three levels: top, middle, and bottom. Place the slide vertically in a beaker of water:

  • The top seed stays above water.
  • The middle seed stays just at water level.
  • The bottom seed is fully submerged.

After a few days:

  • The middle seed germinates — it has both water and oxygen.
  • The top seed does not germinate — it has oxygen but no water.
  • The bottom seed fails after a tiny sprout — it has water but too little oxygen (dissolved oxygen is not enough).

[Image/Diagram: Fig. 6.4 The three-bean experiment to demonstrate germination]

(Narrator’s close)
“Together, these experiments prove the lesson of nature: water to awaken, oxygen to energise, warmth to sustain. Germination is not magic. It is life responding faithfully to its three calls.”