Read the following statements, br (a)Unipolar neurons are found in retina of eye and olfactory epithelium, br (b) Except microglial cells, all cells of nervous tissue develop from ectoderm, br (c) Astrocytes and neurolemmocytes perform functions like phagocytosis and providing nutrition to the neurons respectively, br (d) Unmyelinated neurons are commonly found in autonomous neural system, br Choose the option which includes correct statements only,

Options

A. (b) & (d)
B. (a), (b) & (d)
C. (b),(C) & (d)
D. (a) & (c)

Answer

To solve the question, we need to evaluate each of the four statements provided and determine which ones are correct.

### Step-by-Step Solution:

1. **Evaluate Statement A**:
- **Statement**: "Unipolar neurons are found in retina of eye and olfactory epithelium."
- **Analysis**: This statement is incorrect. The retina of the eye primarily contains bipolar neurons, not unipolar neurons. Unipolar neurons are typically found in sensory ganglia.
- **Conclusion**: Statement A is **false**.

2. **Evaluate Statement B**:
- **Statement**: "Except microglial cells, all cells of nervous tissue develop from ectoderm."
- **Analysis**: This statement is correct. Most cells of the nervous system, including neurons and glial cells (except for microglial cells), originate from the ectoderm. Microglial cells are derived from the mesoderm.
- **Conclusion**: Statement B is **true**.

3. **Evaluate Statement C**:
- **Statement**: "Astrocytes and neurolemmocytes perform functions like phagocytosis and providing nutrition to the neurons respectively."
- **Analysis**: This statement is incorrect. Astrocytes do provide nutrition to neurons, but neurolemmocytes (also known as Schwann cells) are responsible for myelinating axons, not performing phagocytosis.
- **Conclusion**: Statement C is **false**.

4. **Evaluate Statement D**:
- **Statement**: "Unmyelinated neurons are commonly found in autonomous neural system."
- **Analysis**: This statement is correct. Unmyelinated neurons are indeed found in the autonomic nervous system, where they play a role in transmitting signals.
- **Conclusion**: Statement D is **true**.

### Final Conclusion:
- The correct statements are B and D. Therefore, the option that includes the correct statements only is **B and D**.