The development of male gametophyte in angiosperms is

Options

A. Partly in-situ in anther and partly ex-situ on stigma.
B. Fully in-situ in anther
C. Fully Ex-situ on stigma
D. In-vitro only

Answer

To solve the question regarding the development of male gametophyte in angiosperms, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Male Gametophyte**:
- In angiosperms, the male gametophyte is represented by the pollen grain. It is crucial to know that the pollen grain is the structure that will develop into the male gametes.

2. **Development Phases**:
- The development of the male gametophyte occurs in two main phases: in-situ (inside the anther) and ex-situ (outside the anther, specifically on the stigma).

3. **In-Situ Development**:
- The in-situ phase occurs in the anther of the flower. Here, the pollen grains are formed through a process called microgametogenesis, which involves the formation of generative cells and the male gametes.

4. **Ex-Situ Development**:
- The ex-situ phase occurs on the stigma of the flower. After pollination, the pollen grain germinates on the stigma, forming a pollen tube. During this phase, the tube nucleus divides, leading to the formation of the male gametes.

5. **Conclusion**:
- Since the development of the male gametophyte involves both in-situ development in the anther and ex-situ development on the stigma, the correct answer to the question is that the development of the male gametophyte in angiosperms is "partly in-situ on anther and partly ex-situ on stigma."

### Final Answer:
The correct option is: **partly in-situ on anther and partly ex-situ on stigma.**

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