Largest male and femal gamete are formed by ____ and ______ respectively

Options

A. Cycas, Pinus
B. Pinus, Cycas
C. Cycas, Cycas
D. Pinus, Pinus

Answer

To answer the question about the largest male and female gametes, we will analyze the options provided and identify the correct ones based on the characteristics of the plants mentioned.

### Step-by-Step Solution:

1. **Understanding Gametes**:
- Male gametes are typically smaller and motile, while female gametes are larger and non-motile. In plants, male gametes are produced from microspores, and female gametes are produced from megaspores.

2. **Identifying the Plants**:
- The question provides four options:
- Option 1: Cycus and Pinus
- Option 2: Pinus and Cycus
- Option 3: Cycus and Cycus
- Option 4: Pinus and Cycus

3. **Analyzing Cycus**:
- Cycus is a genus of gymnosperms known for producing large gametes. It is characterized by having a sporophytic plant body and undergoing oogamous reproduction, meaning it has distinct male and female gametes.

4. **Analyzing Pinus**:
- Pinus, another gymnosperm, produces male and female gametes as well, but they are not as large as those produced by Cycus.

5. **Determining the Largest Gametes**:
- In the context of the question, we need to identify which plant produces the largest male and female gametes. Since Cycus is known for having the largest gametes among gymnosperms, we conclude that both the largest male and female gametes are formed by Cycus.

6. **Final Answer**:
- Therefore, the answer to the question is: The largest male gamete is formed by **Cycus** and the largest female gamete is also formed by **Cycus**.

### Conclusion:
The final answer is:
- Largest male gamete is formed by **Cycus**.
- Largest female gamete is formed by **Cycus**.