Read the following statements about the human nervous system :
(i) A multipolar neuron is with one axon and two or more dendrites , found in the cerebral cortex.
(ii) in resting condition, the sodium-potassium pump transports `3 Na^(+)` inwards and `2K^(+)` outwards the cell.
(iii) Midbrain and hindbrain form the brain stem including the cerebellum.
(iv) the pons of the hindbrain is directly connected to the spinal cord to control respiration.
How many statement/s from above is/are incorrect ?

Options

A. Three
B. Two
C. One
D. Four

Answer

To determine how many statements about the human nervous system are incorrect, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (i)**: "A multipolar neuron is with one axon and two or more dendrites, found in the cerebral cortex."
- **Analysis**: This statement is correct. Multipolar neurons have one axon and multiple dendrites, and they are indeed found in the cerebral cortex.

2. **Statement (ii)**: "In resting condition, the sodium-potassium pump transports 3 Na^(+) inwards and 2 K^(+) outwards the cell."
- **Analysis**: This statement is incorrect. The sodium-potassium pump actually transports 3 Na^(+) ions out of the cell and 2 K^(+) ions into the cell during each cycle. Therefore, this statement is false.

3. **Statement (iii)**: "Midbrain and hindbrain form the brain stem including the cerebellum."
- **Analysis**: This statement is also incorrect. The brain stem is composed of the midbrain, pons, and medulla oblongata, but it does not include the cerebellum. Thus, this statement is false.

4. **Statement (iv)**: "The pons of the hindbrain is directly connected to the spinal cord to control respiration."
- **Analysis**: This statement is incorrect. While the pons is part of the hindbrain, it is not directly connected to the spinal cord for respiration control. The medulla oblongata is primarily responsible for controlling respiration, while the pons assists in regulating it.

### Conclusion:
- **Correct Statements**: 1 (Statement i)
- **Incorrect Statements**: 3 (Statements ii, iii, and iv)

Thus, the number of incorrect statements is **3**.