The plant parts which consist of two generations -
one within the other :
-(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male
gametes
(c) Seed inside the fruit
(d) Embryo sac inside the ovule
(1) -(a) only
(2) -(a), (b) and (c)
(3) (c) and (d)
(4) -(a) and (d)