Question

Assertion (A): Secondary growth is absent in monocots generally.
Reason (R): Vascular bundles are conjoint and closed.

• A. A and R are correct. R is the correct explanation of A.
• B. A and R are correct. R is not the correct explanation of A.
• C. A is correct but R is incorrect.
• D. A is incorrect but R is correct.

Hint:

Monocots lack secondary growth due to the absence of vascular cambium. This is because their vascular bundles are conjoint and closed, making secondary growth impossible.

Answer 1

The Correct Option is A

Analyzing the Assertion and Reason

• Assertion (A): "Secondary growth is absent in monocots generally." This statement is correct. Monocots generally do not show secondary growth because they lack the vascular cambium, which is responsible for secondary growth.
• Reason (R): "Vascular bundles are conjoint and closed." This statement is also correct. In monocots, vascular bundles are conjoint (the xylem and phloem are arranged together) and closed (there is no vascular cambium between the xylem and phloem). The absence of vascular cambium explains the lack of secondary growth in monocots.

Conclusion: Since both the assertion and reason are correct, and the reason correctly explains the assertion, the correct answer is:

(1) A and R are correct. R is the correct explanation of A.