I. Many xerophytic plants have thick cuticle | vedclass

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(D) $I.$ Xerophytic plants possess adaptations like thick cuticles and sunken stomata to minimize water loss,which is correct.$II.$ $CAM$ (Crassulacea

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$I, II$ and $III$

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(D) $I.$ Xerophytic plants possess adaptations like thick cuticles and sunken stomata to minimize water loss,which is correct.$II.$ $CAM$ (Crassulacean Acid Metabolism) is a photosynthetic pathway in xerophytes that allows stomata to remain closed during the day to prevent transpiration,which is correct.$III.$ In $Opuntia$,leaves are modified into spines to reduce water loss,and the stem becomes a flattened,photosynthetic structure called a phylloclade,which is correct.$IV.$ Not all adaptations are genetically fixed. Some adaptations,such as behavioral responses (e.g.,hibernation,aestivation,or migration to avoid extreme temperatures),are physiological or behavioral adjustments that are not necessarily genetically fixed in the same way as morphological traits.

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