Identify the gametophytic stage of pteridophyta.

Options

A. Prothallus
B. Protonema
C. Apogamy
D. Apospory

Explanation

### Step-by-Step Solution:

1. **Understanding Gametophyte Stage**: The gametophyte stage in plants is the haploid phase where gametes (male and female) are produced. In pteridophytes, this stage is crucial for reproduction.

2. **Identifying the Structure**: In pteridophytes, the gametophyte is represented by a structure known as the prothallus. This is a small, heart-shaped, and typically green structure that develops from a spore.

3. **Function of Prothallus**: The prothallus contains both male and female reproductive organs. The male gametes are produced in antheridia, while the female gametes are produced in archegonia.

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