`Na^+ – K^+` pump
(A) Transports `3Na^+` inwards & `2K^+` outwards. (B) Maintain ionic gradients by active transport. (C) Works against a concentration gradient. How many of above statements are false ?

Options

A. 4
B. 3
C. 2
D. 1

Answer

To solve the question regarding the `Na^+ – K^+` pump, we need to evaluate each of the statements provided and determine how many of them are false.

### Step-by-Step Solution:

1. **Evaluate Statement (A)**:
- The statement claims that the Na^+ – K^+ pump transports `3Na^+` ions inwards and `2K^+` ions outwards.
- This statement is **false** because the Na^+ – K^+ pump actually transports `3Na^+` ions **outwards** and `2K^+` ions **inwards**.

2. **Evaluate Statement (B)**:
- This statement asserts that the Na^+ – K^+ pump maintains ionic gradients by active transport.
- This statement is **true**. The pump actively transports ions against their concentration gradients, thereby maintaining the ionic gradients across the cell membrane.

3. **Evaluate Statement (C)**:
- The statement indicates that the Na^+ – K^+ pump works against a concentration gradient.
- This statement is also **true**. The pump uses ATP to move ions from areas of lower concentration to areas of higher concentration, which is characteristic of active transport.

4. **Count the False Statements**:
- From our evaluation, we found that:
- Statement (A) is false.
- Statements (B) and (C) are true.
- Therefore, there is **1 false statement**.

### Final Answer:
Only **1 statement** is false.

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