Which of following is not an adaptation for Xerophytes ?

Question

Accepted Answer

Option 4, "Presence of aerenchymatous cells in stem," is the correct answer because aerenchyma is a tissue primarily associated with plants that grow in aquatic or waterlogged environments, not xerophytes. Aerenchyma facilitates gas exchange and buoyancy in aquatic plants by creating air spaces within the tissue. Xerophytes, on the other hand, are adapted to arid environments where water conservation is crucial, and the presence of aerenchymatous cells would not be beneficial for such conditions.

Now, let's explain why the other options are incorrect for identifying non-adaptations of xerophytes:

1. **Presence of chlorenchymatous tissue in stem cortex**: Chlorenchyma is a type of parenchyma that contains chlorophyll and is involved in photosynthesis. In xerophytes, having chlorenchymatous tissue in the stem cortex is beneficial as it allows the plant to perform photosynthesis efficiently, especially when leaves are reduced or modified to minimize water loss.

2. **Presence of sclerenchymatous tissue in stem hypodermis**: Sclerenchyma provides structural support and protection. In xerophytes, the presence of sclerenchymatous tissue in the stem hypodermis helps in reducing water loss by providing a tough barrier against environmental stress and minimizing damage from herbivores or physical abrasion.

3. **Presence of waxy layer on aerial plant parts**: A waxy layer, or cuticle, is a common adaptation in xerophytes to reduce water loss through transpiration. This layer acts as a barrier to water evaporation, helping the plant conserve moisture in arid conditions.

In summary, Option 4 is the correct answer because aerenchymatous cells are not an adaptation for xerophytes, which are adapted to dry environments, whereas the other options describe features that help xerophytes survive in such conditions.