Question

In moss capsule, the number of peristome whorls are

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is B 2

In mosses, the peristome is a specialized structure in the sporangium that allows for gradual spore discharge, instead of releasing them all at once.

Peristome is a ring of triangular teeth formed from the remnants of dead cells with thickened cell walls. There are usually 16 such teeth in a single peristome, separate from each other and able to both fold in to cover the stoma as well as fold back to open the stoma. There are two rings of peristome teeth - an inner endostome and an exostome. These are also referred as perostome whorls.

Therefore the correct option is B.