Question

Palisade parenchyma is present on both sides in
A. Nerium
B. Eucalyptus
C. Wheat
D. Both A and B

Answer 1

Plants have been adapted to various conditions depending on their surroundings. They can adapt themselves according to the requirements. Some can grow in less water, while some need excess of water to grow. The presence of salt concentration is also another aspect.

Complete answer:
Xerophytic means able to survive in low water conditions. Mesophyll in xerophytic leaves is of two types- palisade and spongy. These leaves will have palisade parenchyma on both of its sides. These both sides are the upper epidermis and lower epidermis. The epidermis is the outer cell layer of the plant cell.
These palisade parenchyma cells are cylindrical shapes, with a large number of chlorophylls in them. Whilst the spongy cells have less number of chlorophylls and are oval.

Option A: Nerium: It is a plant used as a medicine. It is toxic to the body as a single leaf intake can harm a human. It is a xerophytic plant having palisade parenchyma on both sides of leaves.

Option B: Eucalyptus: It is one of the useful plants having the antioxidant property, it is used to treat dry skin and reduce pain. It is a xerophytic leaf plant having palisade cells on both sides of leaves.

Option C: Wheat: It is the staple food in many states. The leaves of wheat have sheath around them and lamina. A ligule is present at the junction of the sheath. The base of leaves is thickened like a knob. They need a good quantity of water to grow.

Hence, the correct answer is option (D).

Note: Xerophytes are adapted to the harsh extreme conditions of dryness. They can live with very less amount of water as they use the stored water for their daily life. They are usually found in the desert arid regions. They will have adaptations to avoid transpiration.