An ovule which becomes curved so that the nucellus and embryo sac lie at right angles to the funicle is

Male gametes in angiosperms are formed by the division of

Nucellar embryo is

functions as landing platform for the pollen grains in flowering plants.

Some plant have a habit of harbouring ants to save the plants from damage by other animals which is known as

Vegetative propagation in Pistia occurs by