Cross pollination in crop plant is known as

Options

A. allogamy
B. autogamy
C. chasmogamy
D. cleistogamy

Answer

To answer the question "Cross pollination in crop plant is known as," we need to understand the different types of pollination and identify which term corresponds to cross pollination.

### Step-by-Step Solution:

1. **Define Pollination**: Pollination is the process where pollen grains are transferred from the male part of a flower (anther) to the female part (stigma).

2. **Types of Pollination**: There are two main types of pollination:
- **Self-Pollination (Autogamy)**: This occurs when pollen grains are transferred to the stigma of the same flower or another flower on the same plant.
- **Cross-Pollination (Allogamy)**: This occurs when pollen grains are transferred from the anther of one flower to the stigma of a different flower, typically on a different plant.

3. **Identify the Terms**: The question provides four options:
- Autogamy
- Allogamy
- Calistogamy
- Tachmogamy

4. **Analyze the Options**:
- **Autogamy**: This is self-pollination, where pollen is transferred within the same flower or plant. This is not cross-pollination.
- **Allogamy**: This is cross-pollination, where pollen is transferred from one plant to another. This is the correct term for cross-pollination.
- **Calistogamy**: This refers to a type of self-pollination that occurs in closed flowers. This is also not cross-pollination.
- **Tachmogamy**: This term is less commonly used and generally refers to a specific mechanism of pollination, but it is not the standard term for cross-pollination.

5. **Conclusion**: Based on the definitions and analysis, the correct answer to the question is **Allogamy**.

### Final Answer:
Cross pollination in crop plants is known as **Allogamy**.