The most important food reserves of animals and plants are

Options

A. Carbohydrates
B. Proteins
C. Vitamins
D. Fats

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Question:**
The question asks about the most important food reserves in animals and plants. We need to identify which biomolecule serves this purpose.

2. **Analyzing the Options:**
The options provided are:
- Carbohydrates
- Proteins
- Vitamins
- Fats

3. **Identifying Food Reserves:**
- **Carbohydrates:** These are primarily used for energy and can be stored as glycogen in animals and starch in plants. However, they are not the most concentrated form of energy storage.
- **Proteins:** While essential for various functions in the body, proteins are not primarily used for energy storage.
- **Vitamins:** These are essential nutrients but do not serve as energy reserves.
- **Fats:** Fats are the most concentrated form of energy storage in both animals and plants. They are stored in adipose tissues in animals and as oils in plants.

4. **Conclusion:**
Based on the analysis, the most important food reserve for animals and plants is **Fats**. They serve as an energy bank for the body and are stored beneath the skin (subcutaneous fat) in animals.

5. **Final Answer:**
Therefore, the correct answer is **Fats** (Option 4).

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