Question

Assertion In angiosperm, the conduction of water is more efficient because xylem contain vessels.
Reason Conduction of water by xylem vessels elements is an active process with energy supplied by xylem parenchyma rich in mitochondria.

• A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
• B. Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
• C. Assertion is true, but Reason is false.
• D. Both Assertion and Reason are false.

Answer 1

Answer: (C)

Reason Xylem is the principal water conductive tissue forming a continuous system that run through out the plant body. Within the system water passes from the roots tip through the shoot in an unbroken stream.
When water reaches the leveas, much of it transpirate through stomata.
The two principal type conducting element in xylem are trachieds and vessels both of which have thick secondary wall, elongated in shaped and have no living protoplast at maturity.
It conductive trachieds element water flow from trachied to trachied through opening called pits in the secondary walls in contrast, vessels element do nto have pits but contain definite opening or perforations in their endo walls by which they are linked together and through which water flow.
Conduction of water through vessels in not an active process, and is a passive process. Primitive angiosperm have only trachieds but the majority of the living angiosperm posses vessels. Transport of water through vessels is efficient.