a. In Equisetum, the female
gametophyte is retained on the parent sporophyte
b. In Ginkgo, male gametophyte is
not independent
c. The sporophyte in Riccia is
more developed than that in Polytrichum
d. Sexual reproduction in Volvox
is isogamous
e. The spores of slime moulds
lack cell walls
How many of the above statement
are correct?