In which one of the following pollination is autogamous or Pollination which occurs in closed flower is known as

Options

A. Xenogamy
B. Chasmogamy
C. Cleistogamy
D. Geitonogamy

Explanation

To solve the question about the type of pollination that is autogamous or occurs in a closed flower, we will analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the type of pollination that is autogamous, meaning self-pollination, and occurs in a closed flower.

2. **Analyzing the Options**:
- **Option A: Xenogamy**: This refers to cross-pollination between flowers of different plants. Since it involves different plants, it cannot be autogamous. Therefore, this option is incorrect.

- **Option B: Casmogamy**: This is a type of self-pollination that occurs in open bisexual flowers. Although it involves self-pollination, it does not occur in a closed flower. Thus, this option is also incorrect.

- **Option C: Clistogamy**: This refers to a type of pollination that occurs in closed flowers (buds) where both male and female reproductive parts are present. Since the flower remains closed, it ensures self-pollination without the involvement of external pollinators. This option is correct.

- **Option D: Guitonogamy**: This involves pollination between two flowers of the same plant, which is functionally cross-pollination. However, it does not occur in a closed flower, making this option incorrect.

3. **Conclusion**: After analyzing all the options, the correct answer is **Option C: Clistogamy**. This type of pollination occurs in closed flowers and is autogamous.

### Final Answer:
The type of pollination that is autogamous or occurs in a closed flower is known as **Clistogamy**.

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