palisade parechyma is present on both sides in

Options

A. (a) Nerium
B. (b) Eucalyptus
C. (c) Wheat
D. (d) Both (a) and (b)

Answer

### Step-by-Step Solution:

1. **Understanding Palisade Parenchyma**:
- Palisade parenchyma is a type of mesophyll tissue found in leaves. It is primarily responsible for photosynthesis due to its high chloroplast content.

2. **Location in the Leaf**:
- Typically, palisade parenchyma is located beneath the upper epidermis of the leaf. However, in certain plants, such as xerophytes, it can be found on both the upper and lower sides of the leaf.

3. **Characteristics of Xerophytes**:
- Xerophytes are plants adapted to survive in environments with very low water availability and high temperatures. They have special adaptations to minimize water loss and maximize photosynthesis.

4. **Adaptation of Palisade Parenchyma**:
- In xerophytes, having palisade parenchyma on both sides of the leaf allows for efficient photosynthesis even in harsh conditions. The compact, rod-shaped cells maximize light absorption.

5. **Comparison with Spongy Parenchyma**:
- Unlike the palisade parenchyma, spongy parenchyma is irregularly arranged and has a spherical shape, which aids in gas exchange.

6. **Identifying Examples**:
- The question provides options, including plants like Nerium and Eucalyptus, which are both xerophytes. Wheat is a mesophyte and does not have palisade parenchyma on both sides.

7. **Conclusion**:
- Since both Nerium and Eucalyptus exhibit palisade parenchyma on both sides of their leaves, the correct answer is option D: both A (Nerium) and B (Eucalyptus).