Which of the following type of pollination is present in Santalum?

In entomophily, flowers are

In flowering plants, the generative cell of pollen grain divides mitotically to give rise to the:

Porogamy is entry of pollen tube into ovule through the

Entry of pollen tube into the embryo sac is under......... guidance.

The precautionary measures in artificial hybridization is/are

Double fertilization was discovered by Nawaschin and Guignard in

The cells of the endosperm are filed with reserve food materials and are used for the nutrition of developing embryo is generally a ............ in angiosperms.