Essential fatty acids are

Options

A. not sythesized in plants
B. not synthesized in animals
C. five in number
D. both (2) and (3)

Answer

**Step-by-Step Solution:**

1. **Definition of Essential Fatty Acids**: Essential fatty acids (EFAs) are fatty acids that are crucial for various biological processes in the body. They are termed "essential" because they cannot be synthesized by the body and must be obtained through diet.

2. **Importance of Essential Fatty Acids**: These fatty acids play significant roles in maintaining cell membrane integrity, producing hormones, and supporting overall health. They are vital for growth and development, particularly in the brain and nervous system.

3. **Types of Essential Fatty Acids**: There are two primary essential fatty acids:
- **Alpha-linolenic acid (ALA)**: This is an omega-3 fatty acid, which is important for heart health and has anti-inflammatory properties.
- **Linoleic acid (LA)**: This is an omega-6 fatty acid, which is essential for skin health and cellular function.

4. **Synthesis in the Body**: The key characteristic of essential fatty acids is that they are not synthesized in the body. This means that animals, including humans, must obtain them from external sources, such as food.

5. **Analyzing the Options**:
- Option 1: "Not synthesized in plants" - This is incorrect because plants can synthesize fatty acids.
- Option 2: "Not synthesized in animals" - This is correct as EFAs cannot be produced by the animal body.
- Option 3: "5 in number" - This is incorrect as there are only two essential fatty acids.
- Option 4: "Both 2 and 3" - This is incorrect since only option 2 is correct.

6. **Conclusion**: The correct answer is that essential fatty acids are "not synthesized in animals," meaning they must be obtained from dietary sources.

---