Mitosis occurs in
I. Cells of root apex
II. Cells of stem apex
III. Functional megaspore of the plants
IV. Functional microspore of the plants

Options

A. I & II
B. III & IV
C. I, II, III
D. I, II, III, IV

Answer

To determine where mitosis occurs among the given options, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Understanding Mitosis**:
- Mitosis is a type of cell division that results in two daughter cells, each with the same number of chromosomes as the parent cell. It is essential for growth, repair, and asexual reproduction in multicellular organisms.

2. **Analyzing Option I - Cells of Root Apex**:
- The root apex is a region of active growth in plants. Mitosis occurs here to produce new cells for root growth.
- **Conclusion**: This option is correct.

3. **Analyzing Option II - Cells of Stem Apex**:
- Similar to the root apex, the stem apex (or shoot apex) is also a region of active growth where new cells are formed. Mitosis occurs in this region as well.
- **Conclusion**: This option is correct.

4. **Analyzing Option III - Functional Megaspore of the Plants**:
- The functional megaspore develops into the female gametophyte and does not undergo mitosis in the same way as somatic cells. Instead, it undergoes meiosis to produce haploid cells.
- **Conclusion**: This option is incorrect.

5. **Analyzing Option IV - Functional Microspore of the Plants**:
- The functional microspore develops into the male gametophyte and also does not undergo mitosis in the same manner as somatic cells. It typically undergoes meiosis to produce haploid cells.
- **Conclusion**: This option is incorrect.

### Final Conclusion:
Mitosis occurs in:
- I. Cells of root apex (Correct)
- II. Cells of stem apex (Correct)
- III. Functional megaspore of the plants (Incorrect)
- IV. Functional microspore of the plants (Incorrect)

Thus, the correct options where mitosis occurs are **I and II**.