Assertion : Sapwood is less durable than the heartwood.
Reason : Hollow tree trunks are due to the disappearance of sapwood.

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false

Answer

C

Explanation

Heartwood has a much lower starch content and the hollow cells are filled with extractives that are some times toxic to fungi and an insect giving it much higher durability than sapwood is much loss durable than heartwood the high starch content in sapwood makes it very attractive to fungi and insects.
Hollow trees can be cause due to injury such as breakage of a limb as a result it create an opening through the bark and exposes the sapwood. The sapwood is attacked by fungi and bacteria which forms a cavity in a tree.