Step 1: Concept Overview:
The question seeks the feature NOT associated with xerophytes (plants adapted to arid environments). Xerophytes primarily adapt to minimize water loss and maximize water storage.
Step 2: Detailed Analysis:
Analyzing each option:
(A) Lacks Aerenchyma: Aerenchyma, a tissue with air spaces, aids buoyancy and gas exchange in aquatic plants (hydrophytes). Xerophytes, in dry conditions, lack this; its absence is a xerophytic trait.
(B) Chlorophyll mostly in stem and leaves: Xerophytes often have reduced leaves (spines) to limit water loss (e.g., cacti). Stems become flattened and green (containing chlorophyll) to perform photosynthesis. This is a typical xerophytic adaptation.
(C) Palisade generally on both sides of leaves: Leaves exposed to intense light from all directions (isobilateral leaves) often possess palisade mesophyll on both sides to enhance photosynthesis, a common xerophytic feature.
(D) Thin walled epidermal cells: This is not a xerophytic trait. Xerophytes possess thick-walled epidermal cells, often with a thick waxy cuticle and multiple epidermal layers, to prevent water loss via transpiration. Thin walls would provide minimal resistance to water loss.
Step 3: Conclusion:
Thin-walled epidermal cells are characteristic of hydrophytes or mesophytes, not xerophytes. Thus, it's the feature not found in xerophytic plants.