Question

Assertion: The peristome is a fringe of teeth-like projections found at the mouth of the capsule.
Reason: It may be of two types nematodontous and orthodontus.
A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both 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 1

Correct Answer - b
The peristome teeth are present at the mouth of capsule. The teeth may be solid cellular tissue or composed only of the thickened portions of the cell walls of adjacent cells.
When the teeth of peristome are solid structures composed of bundles of dead cells, it is termed nematodontous persistome are solid structures composed of bundles of dead cells. it is termed nematodontous peristome. It is found in polytrichum, Pogonatum and Tetraphis. if peristome composed of thin, membranous, transversaly barred teeth, each tooth is made up of the thickned portions of the cell walls of adjacent cells. Such a peristome is called orthodontous.