X' ensures the production of 'Y' phase in the life cycle of sexually reproducing organisms whereas fertilization restores the 'Z' phase. Identify X, Y and Z

Options

A. X- Mitosis, Y - haploid, Z - haploid
B. X- Mitosis, Y - diploid, Z - diploid
C. X- Meiosis, Y - haploid, Z - diploid
D. X- Meiosis, Y - diploid, Z - diploid

Answer

To solve the question, we need to identify the terms X, Y, and Z based on the provided information about the life cycle of sexually reproducing organisms.

### Step-by-Step Solution:

1. **Understanding the Role of X**:
- The question states that "X ensures the production of 'Y' phase in the life cycle of sexually reproducing organisms."
- In sexually reproducing organisms, the phase that produces gametes (sperm and egg) is meiosis.

**Conclusion**: X = Meiosis

2. **Identifying Y**:
- The 'Y' phase is the result of X (meiosis). The process of meiosis produces gametes, which are haploid cells.
- Therefore, Y represents the gametes produced during meiosis.

**Conclusion**: Y = Gametes (Haploid)

3. **Understanding Z**:
- The question further states that "fertilization restores the 'Z' phase."
- Fertilization is the process where male and female gametes fuse to form a zygote. The zygote is diploid because it contains two sets of chromosomes (one from each parent).

**Conclusion**: Z = Zygote (Diploid)

### Final Identification:
- X = Meiosis
- Y = Gametes (Haploid)
- Z = Zygote (Diploid)