Haploid cells undergo mitosis in

Options

A. All plants and all animals
B. Some lower plants some social insects
C. All higher plants and higher animals
D. Muscle cells of human

Answer

To solve the question "Haploid cells undergo mitosis in?", we will analyze each of the provided options step by step.

### Step-by-Step Solution:

1. **Understanding Haploid Cells**:
- Haploid cells contain a single set of chromosomes (n). In most organisms, haploid cells are typically gametes (sperm and egg cells) or spores.

2. **Analyzing Option 1: All plants and all animals**:
- This option suggests that all plants and animals undergo mitosis with haploid cells. However, this is incorrect as most animals and higher plants primarily undergo meiosis to produce haploid gametes, and mitosis is generally associated with diploid cells. Therefore, this option is **wrong**.

3. **Analyzing Option 2: Some lower plants and some social insects**:
- Some lower plants (like certain algae and fungi) and social insects (like bees and ants) can have haploid life stages that undergo mitosis. In these organisms, haploid cells can divide by mitosis to produce more haploid cells. This option is **correct**.

4. **Analyzing Option 3: All higher plants and higher animals**:
- Higher plants (like angiosperms) and higher animals (like mammals) primarily have a diploid life cycle. They do not undergo mitosis with haploid cells; instead, they produce haploid gametes through meiosis. Hence, this option is **wrong**.

5. **Analyzing Option 4: Muscle cell of human**:
- Muscle cells in humans are diploid (2n) and do not undergo mitosis as haploid cells. This option is also **wrong**.

### Conclusion:
Based on the analysis, the correct answer is **Option 2: Some lower plants and some social insects**.

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