Which of the following pairs in angiosperms are diploid and triploid respectively

Options

A. Microspore mother cell and egg cell
B. Secondary nucleus and endosperm
C. Polar nucleus and secondary nucleus
D. Endosperm and antipodal cells.

Answer

To solve the question, "Which of the following pairs in angiosperms are diploid and triploid respectively?", we need to identify the structures in angiosperms that are classified as diploid (2n) and triploid (3n).

### Step-by-Step Solution:

1. **Understanding Diploid and Triploid**:
- Diploid (2n) means having two sets of chromosomes.
- Triploid (3n) means having three sets of chromosomes.

2. **Identifying Structures**:
- **Microspore Mother Cell**: This cell is diploid (2n) because it undergoes meiosis to produce haploid microspores.
- **Egg Cell**: This cell is haploid (n), as it is one of the gametes produced by the female gametophyte.
- **Secondary Nucleus**: This is formed by the fusion of two haploid polar nuclei in the embryo sac, making it diploid (2n).
- **Endosperm**: This structure is formed by the fusion of one male gamete (haploid) with the secondary nucleus (diploid), resulting in a triploid (3n) endosperm.

3. **Analyzing the Options**:
- The correct pair we are looking for is the one where one structure is diploid and the other is triploid.
- From our analysis, we find that the **Secondary Nucleus** is diploid (2n) and the **Endosperm** is triploid (3n).

4. **Conclusion**:
- The correct answer is the pair of **Secondary Nucleus (Diploid)** and **Endosperm (Triploid)**.

### Final Answer:
The correct pair in angiosperms that are diploid and triploid respectively is **Secondary Nucleus (Diploid) and Endosperm (Triploid)**.

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