In pteridophytes, fusion of gametes takes place in

Options

A. External medium
B. Antheridium
C. Sporangium
D. Archegonium

Answer

To solve the question "In pteridophytes, fusion of gametes takes place in," we can follow these steps:

### Step-by-Step Solution:

1. **Understand Pteridophytes**:
- Pteridophytes are a division of the plant kingdom that includes ferns and other similar plants. They are known for not producing flowers or seeds, which classifies them as cryptogams.

2. **Identify the Process of Fertilization**:
- In pteridophytes, fertilization involves the fusion of male and female gametes. This process typically occurs in a watery environment since the sperm needs water to swim to the egg.

3. **Locate the Structure for Gamete Fusion**:
- The fusion of gametes specifically occurs in a structure called the archegonium. The archegonium is the female reproductive structure in pteridophytes, and it contains a part known as the venter, where the actual fusion of the gametes takes place.

4. **Evaluate the Options**:
- Now, let's analyze the options provided:
- **Option 1: External medium** - This is too vague and does not specify where the gametes fuse.
- **Option 2: Amphibian** - This is incorrect as amphibians are animals, not a part of pteridophyte reproduction.
- **Option 3: Forangium** - This term seems incorrect or misused in this context.
- **Option 4: Archegonium** - This is the correct structure where the fusion of gametes occurs.

5. **Conclude the Answer**:
- Based on the analysis, the correct answer is **Option 4: Archegonium**.

### Final Answer:
In pteridophytes, fusion of gametes takes place in **Archegonium**.