(i) Sketch the cross-section of a leaf and label the following parts:
(a) Chloroplast (b) Cuticle.
(ii) What type of gas evolved during photosynthesis? Also mention the way in which the gas evolved.
(iii) Some plant's stomata remain closed throughout the day. How do these plants prepare food? Also, give the name of such a plant.

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Detailed Solution

(ii) Oxygen gas is released during photosynthesis. The splitting of water evolves this gas.

2𝐻₂𝑂→𝐻₂+𝑂₂

(iii) They take up ₂ at night and prepare an intermediate, which is acted upon by the

energy absorbed by chlorophyll during the day

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