Homeostasis can be defined as

Options

A. Tendency of the animals to change with the surroundings
B. Tendency of the living organism to change the external environment as per their requirements
C. Tendency of the living organism to resist changes in the external environment
D. Tendency of the biological systems to resist changes

Answer

**Step-by-Step Solution:**

1. **Understanding Homeostasis**: Homeostasis is defined as a self-regulating process that biological systems use to maintain stability. This means that organisms have mechanisms in place to keep their internal environment stable despite changes in the external environment.

2. **Stability and Survival**: The primary goal of homeostasis is to maintain an optimal internal environment that is conducive to survival. This involves adjusting physiological processes to counteract external changes.

3. **Example of Homeostasis**: A common example of homeostasis is the regulation of body temperature in humans. Regardless of whether it is hot or cold outside, the human body has mechanisms (like sweating or shivering) to maintain a stable internal temperature.

4. **Evaluating Options**: The question provides several options to define homeostasis:
- Option 1: Tendency of animals to change with the surroundings. (Incorrect)
- Option 2: Tendency of living organisms to change the external environment as per their requirements. (Incorrect)
- Option 3: Tendency of living organisms to resist changes in the external environment. (Correct)
- Option 4: Tendency of biological systems to resist changes. (Incorrect)

5. **Conclusion**: Based on the definitions and examples discussed, the correct definition of homeostasis is the tendency of living organisms to resist changes in the external environment.

**Final Answer**: Homeostasis can be defined as the tendency of living organisms to resist changes in the external environment.

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