The correct option is
A Tiny cells protected by thick walls to survive unfavorable conditions.
- The spores are asexual reproductive
bodies.
- Each tiny spore is covered by a
hard protective coat to withstand
unfavourable conditions such as high
temperature and low humidity. So
they can survive for a long time.
- Under
favourable conditions, a spore
germinates and develops into a new
individual. Plants such as moss and
ferns also reproduce by
means of spores.
- Thus, Option "A" is correct.