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c) sunken stomata
Explanation:
When stomata are sunken in pits , they are not directly exposed to air and sunlight. Rate of transpiration is increased in bright sun so when they are sunken in pits less water loss will take place.
Sunken stomata are seen in xerophytes like Nerium. It is an adaptive feature. In this plant stomata are sunken in crypts , which are even having insulating hair. These hair arise from epidermal cells, they reduce the heating effect of sunlight and further reduce transpiration.
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