Which of the following statements is incorrect w.r.t. adaptations?

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Many xerophytic plants have thick cuticle on leaf epidermis, sunken stomata.

Some xerophytic plants have special photosynthetic pathway (CAM) that enables their stomata close during day.

Opuntia has spines (modified leaves), photosynthetic phylloclade (stem).

All adaptations are genetically fixed in all organisms.

answer is D.

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Detailed Solution

Some essential adaptations have been genetically fixed during the course of an organism's evolutionary timeline. However, there are adaptations developed by humans over the course of their lives, such as muscles strengthened through exercise or behaviour perfected through experience, that help an individual organism to adapt better. So, all adaptations are not genetically fixed in all the organisms.

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