First slide

Pre-fertilisation : Structures and Events

Question

In majority of angiosperms

Easy

A

Agent of pollination is water
B

Pollen grains are shed at 2 celled stage
C

Development of embryo sac is bisporic
D

Reductional division occur in microspores

Solution

Insects (biotic agents) are the most common agents of pollination in angiosperms.
60% angiosperms shed their pollen grains at 2-celled stage containing vegetative cell and generative cells.
In majority of angiosperms, development of embryo sac in monosporic.
Microspore mother cell (2c) undergoes reductional division to form four haploid microspores.

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