Autotrophic nutrition includes

Options

A. Chemosynthesis
B. Photosynthesis
C. Both A and B
D. Ingestive nutrition.

Answer

### Step-by-Step Solution:

1. **Understanding Autotrophic Nutrition**:
- Autotrophic nutrition refers to the process by which organisms produce their own food from simple substances. This type of nutrition is essential for the survival of many organisms, especially plants.

2. **Types of Autotrophic Nutrition**:
- There are two main types of autotrophic nutrition:
- **Photosynthesis**: This process occurs in organisms known as photoautotrophs, which utilize sunlight to convert carbon dioxide and water into glucose and oxygen. These organisms contain chlorophyll, which captures sunlight.
- **Chemosynthesis**: This process occurs in organisms known as chemoautotrophs, which derive energy from chemical reactions involving inorganic substances. They do not rely on sunlight and do not have chlorophyll. Instead, they use chemical compounds to synthesize organic materials.

3. **Analyzing the Options**:
- The options provided are:
- A) Chemosynthesis
- B) Photosynthesis
- C) Both A and B
- D) Ingestive nutrition
- Since both chemosynthesis and photosynthesis are forms of autotrophic nutrition, the correct answer must include both of these processes.

4. **Identifying the Correct Answer**:
- The correct answer is **C) Both A and B**, as both chemosynthesis and photosynthesis are included under the umbrella of autotrophic nutrition.

5. **Excluding Other Options**:
- Option D, ingestive nutrition, is not a form of autotrophic nutrition. Instead, it is a type of heterotrophic nutrition where organisms consume other organisms or organic matter for energy.

### Final Answer:
The correct answer is **C) Both A and B**.

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