This section contains Assertion (A) and Reason (R ) type questions. Each questions has (1), (2), (3), and (4) out of which only one is correct.
Assertion (A) Chordates have a pair of kidneys.
Reason (R ) Non – chordates have also kidneys.

Options

A. Both Assertion and Reason are correct, and Reason is the correct explanation of Assertion
B. Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion
C. Assertion is correct, but Reason is incorrecrt
D. Assertion is incorrect, but Reason is correct

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**: The assertion states that "Chordates have a pair of kidneys." This is true because all chordates possess a well-developed excretory system that includes a pair of kidneys.

2. **Understanding the Reason (R)**: The reason states that "Non-chordates have also kidneys." This statement is misleading. While some non-chordates may have excretory structures, they do not have kidneys in the same sense as chordates do. Non-chordates may have different types of excretory systems, such as nephridia in annelids or Malpighian tubules in arthropods, but they do not possess kidneys like those found in chordates.

3. **Evaluating the Correctness of A and R**:
- The assertion (A) is correct because chordates do have kidneys.
- The reason (R) is incorrect because non-chordates do not have kidneys in the same way that chordates do.

4. **Conclusion**: Since the assertion is true and the reason is false, the correct answer to the question is that both statements are not correct in relation to each other. The correct option is option number 3, which states that the assertion is correct, but the reason is incorrect.