Question
The two layers of teeth in the peristome of moss are
A.
Decorative parts functioning like sepals and petals in a flower
B.
Parts which help in the discharge of spores only when the capsule matures. After the operculum falls, they dry up and open out
C.
Parts which help in the gradual dispersal of spores. The upper teeth are hygroscopic and open out only in dry weather. The lower ones check sudden dispersal
D.
Parts which help in the dispersal of spores. They are not hygroscopic and allow the discharge of spores by disintegration of capsule wall
Answer :
Parts which help in the gradual dispersal of spores. The upper teeth are hygroscopic and open out only in dry weather. The lower ones check sudden dispersal