Study the following statements regarding the anatomy of isobilateral leaf.
(i) Stomata are equally distributed on both the surfaces (ii) certain adaxial epidermal cells are modified into bulliform cells in grasses.
(iii). The vasuclar bundles are radial
(iv). Phloem is adaxially placed.
Which of the above statements are correct?

Options

A. (i) and (ii)
B. (ii) and (iii)
C. (ii) and (iv)
D. all are correct

Explanation

To determine which statements regarding the anatomy of isobilateral leaves are correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (i): Stomata are equally distributed on both surfaces.**
- Isobilateral leaves, also known as equifacial leaves, have stomata present on both the upper (adaxial) and lower (abaxial) surfaces. This statement is **correct**.

2. **Statement (ii): Certain adaxial epidermal cells are modified into bulliform cells in grasses.**
- Bulliform cells are indeed modified epidermal cells found in the upper surface of monocot leaves, including grasses. This statement is also **correct**.

3. **Statement (iii): The vascular bundles are radial.**
- In isobilateral leaves, the vascular bundles are typically collateral and conjoined, not radial. Therefore, this statement is **incorrect**.

4. **Statement (iv): Phloem is adaxially placed.**
- In isobilateral leaves, the phloem is located on the abaxial side (lower surface), while the xylem is on the adaxial side (upper surface). Thus, this statement is **incorrect**.

### Conclusion:
Based on the analysis:
- **Correct Statements:** (i) and (ii)
- **Incorrect Statements:** (iii) and (iv)

The correct statements regarding the anatomy of isobilateral leaves are (i) and (ii).