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(i) Mention any three adaptations found in plarits to favour the process of photosynthesis. 

(ii) Why does one feel blinded for a short while on coming out of a dark room ? 

(iii) Explain how the rate of transpiration is affected on : 

1. a windy day 

2. a foggy day

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(i) Three adaptations found in a green plant in the favour of photosynthesis are: 

1. Leaves being thin and flat, offer a large surface area for the process to occur. 

2. Internally, the loose arrangement of mesophyll tissue allows rapid diffusion of gases 

3. The’high concentration’ of chloroplast in the mesophyll, especially the palisade of the dorsiventral leaves, helps to trap the solar energy required for the process. 

(ii) When we come out from a dark room we feel dazzling effect for a very short period. It is called light adaptation. In this case the diameter of pupil is reduced to allow less light to enter the eyes. 

(iii) 1. On a windy day the rate of transpiration increases as moving wind removes the water vapour from around the leaves. 

2. On a foggy day, the rate of transpiration decreases, because atmospheric moisture (humidity) is high which inhibits the rate of transpiration.

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