Homeostasis is

Options

A. Tendency to change with change in environment
B. Tendency to resist change / self regulatory mechanism
C. Disturbance in regulatory control
D. Plants and animal extracts used in homeopathy.

Answer

**Step-by-Step Solution:**

1. **Definition of Homeostasis**:
Homeostasis refers to the ability of an organism to maintain a stable internal environment despite changes in external conditions. This includes the regulation of various internal conditions such as temperature, pH, and osmotic pressure.

2. **Key Features of Homeostasis**:
The main features of homeostasis include:
- **Thermoregulation**: This is the process by which organisms maintain their body temperature within a certain range, regardless of external temperatures.
- **Osmoregulation**: This involves the regulation of water and solute concentrations in the body to maintain osmotic balance.

3. **Evaluating Options**:
- **Option A**: "Tendency to change with change in environment" - This is incorrect as homeostasis is about maintaining constant internal conditions.
- **Option B**: "Tendency to resist change self-regulatory mechanism" - This is correct as homeostasis involves mechanisms that resist changes in the internal environment.
- **Option C**: "Disturbance in regulatory control" - This is incorrect as it suggests a failure of homeostasis rather than its definition.
- **Option D**: "Plants and animals extract used in homeopathy" - This is irrelevant to the concept of homeostasis.

4. **Conclusion**:
The correct understanding of homeostasis is that it is a self-regulatory mechanism that allows organisms to resist changes in their internal environment, maintaining stability despite external fluctuations.