List of top Biology Questions on Double Fertilisation asked in AIIMS

Primary endosperm nucleus (PEN) is formed by the fusion of

Protandry and protogyny ensures cross fertilization. Cross fertilization introduces variation in progeny.

Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of

Anemophilous flowers have

Pollination by snail and slug is known as