Assertion: Pinus shows formation of annual rings.
Reason: Pinus grows in area of environmental fluctuation.

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

A

Explanation

Secondary wood shows well mark growth rings which are formed annually due to environmental condition. In pinus each annual ring possess a zone of spring wood : (large polygonal, thin walled with wide tracheoids and large bordered pits)