Palisade parenchyma is absent in leaves of

Options

A. Sorghum
B. Mustard
C. Soyabean
D. Gram

Answer

### Step-by-Step Solution:

1. **Understanding Palisade Parenchyma**:
- Palisade parenchyma is a type of tissue found in the leaves of many plants, specifically beneath the upper epidermis. It consists of elongated cells that are oriented perpendicular to the leaf surface, allowing for efficient light absorption.

2. **Identifying Types of Parenchyma**:
- In angiosperms, there are two main types of parenchyma in leaves:
- **Palisade Parenchyma**: Located beneath the upper epidermis, composed of columnar cells.
- **Spongy Parenchyma**: Found in the lower part of the leaf, composed of irregularly shaped cells with intercellular spaces.

3. **Differentiation in Monocots vs. Dicots**:
- In dicotyledonous plants (dicots), the mesophyll is differentiated into palisade and spongy parenchyma.
- In monocotyledonous plants (monocots), the mesophyll is not differentiated. Instead, the chlorophyll-containing cells are scattered, and there is no distinct palisade or spongy parenchyma.

4. **Analyzing the Options**:
- The question asks where palisade parenchyma is absent. The options provided are:
- 1. Sorghum
- 2. Mustard
- 3. Soya bean
- 4. Monocot
- Since sorghum is a monocot, it lacks palisade parenchyma.

5. **Conclusion**:
- Based on the understanding that palisade parenchyma is absent in monocots, the correct answer to the question "Palisade parenchyma is absent in leaves of" is **Sorghum**.