Assertion: Coenosorus lacks true indusium.
Reason: Indusium convers sori.

Options

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

b

Explanation

Indusium is an epidernal membranous outgrowth covering the sori in some ferns. The coenosorus is surrounded by two well formed indusial lips, between which lies the receptacle. The outer indusial lip is well-developed and is formed by the reflexed margin of the pinnule, which overlaps the coenosorus and its sporangia. This is commonly called the false indusium.