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Question
Krishna set-up an experiment with two potted plants of same size and placed one of them in sunlight and the other in a dark room, as shown in Fig. 10.10. Answer the following questions —
(i) What idea might she be testing through this experiment?
(ii) What are the visible differences in plants in both the conditions?
(iii) According to you, leaves of which plants confirm the iodine test for the presence of starch?
Show answer
Answer
She is testing if sunlight is needed for plants to make starch.
Explanation
- (i) She is testing whether sunlight is needed to make food (starch).
- (ii) The sunlight plant is green and healthy; the dark one is pale and weak.
- (iii) Only the leaves of the sunlight plant confirm the iodine test.
- The dark plant makes no starch, so it stays yellow with iodine.
Only the sunlight plant's leaves turn blue-black, showing starch.
← Back to concept: 10.2.1 Leaves: the 'food factories' of plants
