Sieve plates in angiosperms are-

Options

A. (a) Oblique & in lateral walls
B. (b) Pitted & in end walls
C. (c) Oblique & in end wall
D. (d) Straight & in lateral wall

Answer

**Step-by-Step Solution:**

1. **Understanding Sieve Plates**: Sieve plates are specialized structures found in the phloem of angiosperms (flowering plants). They are crucial for the transport of nutrients and sugars.

2. **Identifying the Structure**: In the phloem, sieve plates are located on the sieve tube elements. They are characterized by their perforated nature, allowing for the flow of substances between sieve tube elements.

3. **Examining the Position**: Sieve plates are not found on the lateral walls of the sieve tubes. Instead, they are located at the end walls of the sieve tube elements.

4. **Analyzing the Shape**: The sieve plates in angiosperms are typically oblique, meaning they are angled rather than straight. This oblique positioning facilitates the connection between adjacent sieve tube elements.

5. **Reviewing the Options**:
- Option A: "Oblique and in lateral walls" - Incorrect, as they are not located in lateral walls.
- Option B: "Pitted and in end walls" - Incorrect, as they are perforated, not pitted.
- Option C: "Oblique and in end walls" - Correct, as they are indeed oblique and located at the end walls.
- Option D: "Straight and in lateral walls" - Incorrect, as they are not straight and not in lateral walls.

6. **Conclusion**: Based on the analysis, the correct answer is Option C: "Oblique and in end walls."

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