In oogamy-

Options

A. Male gamete and female gamete are flagellate
B. Male gamete and female gamete are non-flagellate
C. Male gamete is small, motile and produced in large number but female gamete is single passive or static and produced singly
D. Male gamete is non-motile and female gamete is motile

Answer

### Step-by-Step Solution:

1. **Definition of Oogamy**: Oogamy is a type of sexual reproduction observed in certain organisms, including algae. It involves the fusion of two distinct gametes: a large, non-motile female gamete and a small, motile male gamete.

**Hint**: Remember that oogamy is characterized by the size and motility of the gametes.

2. **Characteristics of Gametes**:
- **Female Gamete**:
- Large in size
- Non-motile (static)
- Produced in a single quantity (one per reproductive cycle)
- **Male Gamete**:
- Small in size
- Motile (capable of movement)
- Produced in large numbers

**Hint**: Focus on the differences between the male and female gametes in terms of size and motility.

3. **Comparison with Other Types of Reproduction**: Oogamy is one of the three types of sexual reproduction, the other two being isogamy (where gametes are similar) and anisogamy (where gametes differ in size but both are motile).

**Hint**: Distinguish between the three types of sexual reproduction based on gamete characteristics.

4. **Correct Statement Identification**: Based on the characteristics of the gametes in oogamy:
- The male gamete is small and motile.
- The female gamete is large and non-motile.
- Therefore, the correct statement regarding oogamy is that the male gamete is small and motile, while the female gamete is large and non-motile.

**Hint**: Look for statements that accurately reflect the characteristics of male and female gametes in oogamy.

5. **Conclusion**: The correct statement regarding oogamy is that the male gamete is small and motile, while the female gamete is large and non-motile.

**Hint**: Summarize the key points to reinforce your understanding of oogamy.