Assertion: Electroporation uses electric pulses for making competent host.
Reason: The electrical pulses induce transient pores in the plasmalemma through which DNA molecules are incorporated.

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.

Explanation

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that electroporation uses electric pulses to make a host competent. This means that electroporation is a technique that facilitates the introduction of foreign DNA into a host cell by making the cell membrane permeable.

2. **Understanding the Reason**: The reason provided explains that electrical pulses induce transient pores in the plasmalemma (cell membrane) through which DNA molecules can enter the cell. This is a crucial aspect of the electroporation process, as it describes the mechanism by which the DNA is incorporated into the host.

3. **Analyzing the Relationship**: We need to determine if the reason correctly explains the assertion. The assertion is about the use of electric pulses in electroporation, while the reason describes how these pulses create pores in the cell membrane, allowing DNA to enter.

4. **Conclusion**: Both the assertion and the reason are correct. The assertion correctly identifies the process of electroporation as using electric pulses to make a host competent, and the reason accurately describes the mechanism by which this occurs (the formation of transient pores in the cell membrane).

5. **Final Answer**: Therefore, both the assertion (A) and the reason (R) are correct, but the reason is not a correct explanation of the assertion.