11) Asseration: Tracheids of xylem are with narrow lumen. Reason: Tracheids have thick deposition of lignin on their walls (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 (C) A is true but R is false. (D) A is false but R is true.​

Answer :

Answer:

The assertion that tracheids of xylem have a narrow lumen is true, as these elongated cells serve in the transport of water in vascular plants and their thin, long structure results in a narrow lumen. The reason that tracheids have a thick deposition of lignin on their walls is also true, as lignin is a complex organic polymer that provides structural support to prevent collapse during water transport. However, the thick deposition of lignin is not the direct cause of the narrow lumen, but rather a result of their overall structure and function. Therefore, while both the assertion and reason are true, the reason is not the correct explanation of the assertion.

So, the correct answer is (B) Both A and R are true, and R is not the correct explanation of A.

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