Which of the following is incorrect for the neuron?

Options

A. (1) dendrites and nucleus contain Nissl granules
B. (2) energy consumption is less during conduction of impulse on myelinated neuron as compare to the non-myelinated neuron
C. (3) bipolar neurons are found in the retina of eye
D. (4) unmyelinated nerve fiber is enclosed by a Schwann cell

Answer

**Step-by-Step Solution:**

1. **Understanding Neurons**: Neurons are specialized cells in the nervous system that transmit signals. They consist of various parts, including dendrites, axons, and a nucleus.

2. **Analyzing the Options**:
- **Option 1**: "Dendrites and nucleus contain Nissl granules."
- Dendrites do contain Nissl granules, which are rough endoplasmic reticulum and ribosomes involved in protein synthesis. However, the nucleus does not contain Nissl granules. Therefore, this statement is incorrect.

- **Option 2**: "Energy consumption is less during conduction of impulse on myelinated neuron as compared to non-myelinated neuron."
- This statement is correct. Myelinated neurons conduct impulses more efficiently and with less energy consumption than non-myelinated neurons due to saltatory conduction.

- **Option 3**: "Bipolar neurons are found in the retina of the eye."
- This statement is also correct. Bipolar neurons are indeed found in the retina and play a crucial role in visual processing.

- **Option 4**: "Unmyelinated nerve fiber is enclosed by Schwann cell."
- This statement is correct as well. Schwann cells can surround unmyelinated fibers, providing support and insulation.

3. **Conclusion**: The only incorrect statement among the options provided is Option 1, which states that the nucleus contains Nissl granules.

**Final Answer**: The incorrect statement is Option 1: "Dendrites and nucleus contain Nissl granules."

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