The plant adaptation not suitable for hot and dry climates is
I. CAM
II. Mycorrhizae
III. $C_{4}$ photosynthesis

I only

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II only

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I and II

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I and III

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I, II, and III

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Solution

The correct option is A II only
Spatial separation of carbon dioxide fixation and RUBISCO activity in mesophyll and bundle sheath cells of $C_{4}$ plants respectively avoids photorespiration by concentrating $C O_{2}$ in bundle sheath cells to scale down the oxygenase activity of RUBISCO and increase the RUBISCO efficiency. The increased RUBISCO efficiency allows higher rates of photosynthesis even when stomata are closed for the longer time as well as reduces photorespiration and water loss. CAM plants reduce water loss by opening the stomata at night only. Mycorrhizae are the symbiotic fungi that reside in roots of higher plants and increase soil fertility by nitrogen fixation; it does not impart any adaptive feature to plant to cope with hot and dry conditions.
Therefore, the correct answer is option B.

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C_{4}

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I I I

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I I - I I I I + I I I + I I I I I =

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