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Question
Vani believes that 'carbon dioxide is essential for photosynthesis'. She puts an experimental set-up, as shown in Fig. 10.11, to collect evidence to support or reject her idea. Answer the following questions —
(i) In which plant(s) in the above set-up(s) will starch be formed?
(ii) In which plant(s) in the above set-up(s) will starch not be formed?
(iii) In which plant(s) in the above set-up(s) will oxygen be generated?
(iv) In which plant(s) in the above set-up(s) will oxygen not be generated?
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Answer
Both starch and oxygen form only with sunlight and carbon dioxide together.
Explanation
- (i) Starch forms only in (a) sunlight with carbon dioxide.
- (ii) Starch does not form in (b), (c), and (d).
- (iii) Oxygen is generated in (a) sunlight with carbon dioxide.
- (iv) Oxygen is not generated in (b), (c), and (d).
Photosynthesis needs both sunlight and carbon dioxide, so only set-up (a) works.
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