Development of a sporophyte directly from the gametophytic tissue is called

Options

A. Apospory
B. Apogamy
C. Adventive embryony
D. Parthenogenesis

Answer

To solve the question "Development of a sporophyte directly from the gametophytic tissue is called," we will analyze the given options and their definitions step by step.

### Step 1: Understand the Terms
1. **Apospory**: This refers to the development of a gametophyte from sporophytic tissue without the formation of spores.
2. **Apogamy**: This is the development of a sporophyte directly from gametophytic tissue without the formation of gametes.
3. **Adventive embryonic**: This describes embryonic development that occurs without fertilization, where the embryo develops from tissues such as the nucellus or integumentary cells.
4. **Parthenogenesis**: This is a form of asexual reproduction where an unfertilized egg develops into a new individual.

### Step 2: Identify the Correct Answer
From the definitions:
- Apospory is not correct because it involves the formation of a gametophyte from sporophytic tissue.
- Adventive embryonic is also not correct as it involves embryonic development without fertilization, but not directly from gametophytic tissue.
- Parthenogenesis does not relate to the development of a sporophyte from gametophytic tissue.

The only option that fits the definition provided in the question is **Apogamy**, as it specifically refers to the development of a sporophyte directly from gametophytic tissue without the formation of gametes.

### Conclusion
The correct answer to the question is **Apogamy**.

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