Sieve tubes and companion cells are absent in

Options

A. Angiosperms
B. Pea
C. Mango
D. Pteridophyta.

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks where sieve tubes and companion cells are absent. These structures are part of the phloem in vascular plants.

2. **Identifying the Options**: The options provided are:
- Angiosperms
- Pea
- Mango
- Pteridophyta

3. **Analyzing Each Option**:
- **Angiosperms**: These are flowering plants that produce seeds. They have a complex vascular system, including sieve tubes and companion cells in their phloem.
- **Pea**: This is a type of angiosperm. Therefore, it also contains sieve tubes and companion cells.
- **Mango**: Like pea, mango is also an angiosperm and has sieve tubes and companion cells.
- **Pteridophyta**: These are non-flowering vascular plants (like ferns) that do not produce seeds. They have a simpler vascular system and lack sieve tubes and companion cells in their phloem.

4. **Conclusion**: Based on the analysis, the correct answer is **Pteridophyta**, as they are the only group listed that does not contain sieve tubes and companion cells.

5. **Final Answer**: Sieve tubes and companion cells are absent in **Pteridophyta**.

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