State whether the given statements are true or false.
I. Bacteria show both autotrophic and heterotrophic nutrition.
II. Some of the bacteria are autotrophic. They may be photosynthetic autotrophic or chemosyntetic autotrophic. III. Heterotrophic nurition involves obtaining of readymade organic food from outside source.

Options

A. Only I is true
B. I and II are true
C. I is true, II and III are false
D. All are true

Answer

**Step-by-Step Solution:**

1. **Analyze Statement I:**
- The statement claims that bacteria show both autotrophic and heterotrophic nutrition.
- Explanation: Bacteria can indeed be classified into autotrophic bacteria, which can produce their own food (e.g., through photosynthesis or chemosynthesis), and heterotrophic bacteria, which obtain their food from external sources.
- Conclusion: This statement is **True**.

2. **Analyze Statement II:**
- The statement asserts that some bacteria are autotrophic and can be either photosynthetic or chemosynthetic.
- Explanation: This is accurate as there are bacteria that perform photosynthesis (like cyanobacteria) and others that derive energy from chemical reactions involving inorganic substances (chemosynthetic bacteria).
- Conclusion: This statement is **True**.

3. **Analyze Statement III:**
- The statement defines heterotrophic nutrition as obtaining ready-made organic food from an outside source.
- Explanation: Heterotrophic organisms cannot synthesize their own food and rely on consuming organic material produced by other organisms.
- Conclusion: This statement is **True**.

4. **Final Conclusion:**
- Since all three statements are true, the overall conclusion is that all statements are correct.

**Final Answer: All statements are True.**

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