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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.
Fig. A potted plant with sufficient water is placed under the prescribed conditions.
(a) Sunlight with carbon dioxide
(b) Sunlight without carbon dioxide
(a) Dark with
(b) Dark without carbon dioxide carbon dioxide
Answer the following questions.
(i) In which plant(s) in the above set-up(s) will starch be formed?
Only in plant kept in sunlight with carbon dioxide, starch will be formed. (ii) In which plant(s) in the above set-up(s) will starch not be formed? Answer: In all plants except the plant kept in sunlight with carbon dioxide. (iii) In which plant(s) in the above set-up(s) will oxygen be generated? Answer: Oxygen will be generated in a plant kept in sunlight with carbon dioxide. (iv) In which plant(s) in the above set-up(s) will oxygen not be generated? Answer: Except for the plant kept in sunlight with carbon dioxide, oxygen will not be generated in any of the other plants.