What is an auxotropy :-

Options

A. A plant that respondy by bending towards the sun
B. A mutant (organism) which has lost its ability to synthesize one or more essential compounds
C. An organism that depends on another organism for meeting its nutritional requirements
D. A plant that is able to synthesize its own carbohydrates

Answer

### Step-by-Step Solution:

1. **Understanding the Term "Auxotrophy":**
- Auxotrophy refers to a condition in which an organism cannot synthesize a particular compound required for its growth and must obtain it from its environment.

2. **Identifying the Correct Definition:**
- Among the options provided:
- **Option 1:** A plant that bends towards the sun (phototropism) - Not related to auxotrophy.
- **Option 2:** A mutant organism that has lost the ability to synthesize one or more essential compounds - This is the definition of an auxotroph.
- **Option 3:** An organism that depends on another for nutritional requirements - This describes heterotrophs, not auxotrophs.
- **Option 4:** A plant that synthesizes its own carbohydrates - This describes autotrophs, not auxotrophs.

3. **Conclusion:**
- The correct answer is **Option 2**, which states that an auxotroph is a mutant organism that has lost its ability to synthesize one or more essential compounds.