Assertion: Bacterial cells first be made competent by monovalent cations, to take up DNA
Reason :It increases the efficiency with which DNA enters the bacterium through the pores in cell wall

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion
B. It both Assertion & Reason are True but Reason is not a correct explanation of the Assetion
C. If Assertion is True but the Reason is False
D. If both Assertion & Reason are false

Answer

To solve the assertion-reason question, we need to analyze both the assertion and the reason carefully.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Bacterial cells first be made competent by monovalent cations to take up DNA."
- This statement is incorrect because bacterial cells are typically made competent using divalent cations, such as calcium ions (Ca²⁺), rather than monovalent cations.

2. **Understanding the Reason**:
- The reason states that "It increases the efficiency with which DNA enters the bacterium through the pores in the cell wall."
- While this statement is partially true (the efficiency of DNA uptake does increase), it is misleading in the context of the assertion because it does not accurately describe the role of monovalent cations. Divalent cations create pores in the cell membrane, facilitating DNA uptake.

3. **Evaluating the Relationship**:
- Since the assertion is false (it mentions monovalent cations instead of divalent cations), and the reason, while somewhat true, does not correctly support the assertion, we conclude that both the assertion and the reason are false.

4. **Conclusion**:
- Therefore, the correct answer is that both the assertion and the reason are false.

### Final Answer:
Both assertion and reason are false.