It has been observed that , colourless cells are modified from the adaxial epidermal cells of leaf in grasses near the veins. What are these modified cells called as ?

Options

A. Heterocysts
B. Bulliform cells
C. Companion cells
D. Trichomes

Answer

To solve the question regarding the modified colorless cells derived from the adaxial epidermal cells of leaves in grasses, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the name of modified colorless cells that originate from the adaxial epidermal cells of grass leaves, specifically near the veins.

2. **Identifying Key Terms**:
- **Colorless Cells**: These cells do not contain chlorophyll.
- **Adaxial Epidermal Cells**: Refers to the upper surface of the leaf.
- **Grasses**: This indicates we are dealing with monocotyledonous plants.

3. **Analyzing the Options**:
- **Heterocyst**: These are nitrogen-fixing cells found in certain bacteria, not related to the epidermal cells of grasses.
- **Puliform Cells**: These are indeed found in the upper surface of monocots (like grasses) and are known to be colorless. They help in reducing water loss.
- **Companion Cells**: These are associated with phloem and are not found in the epidermis of leaves.
- **Trichomes**: These are hair-like structures that can be found on the surface of stems and leaves but are not specifically the modified cells mentioned in the question.

4. **Selecting the Correct Answer**: Based on the analysis, the modified colorless cells that help in reducing water loss and are found in the upper surface of monocots are called **Bulliform Cells**.

### Conclusion:
The modified colorless cells derived from the adaxial epidermal cells of grass leaves near the veins are known as **Bulliform Cells**.

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