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The document discusses the structures and events involved in pre-fertilization in flowering plants, focusing on the male and female reproductive parts. It outlines the stages of sexual reproduction, including pollination, and the subsequent formation of fruits and seeds. The advantages of seeds, such as their role in dispersal and genetic variation, are also highlighted.

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13 views1 page

Biooooo

The document discusses the structures and events involved in pre-fertilization in flowering plants, focusing on the male and female reproductive parts. It outlines the stages of sexual reproduction, including pollination, and the subsequent formation of fruits and seeds. The advantages of seeds, such as their role in dispersal and genetic variation, are also highlighted.

Uploaded by

agamyamishra03
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as TXT, PDF, TXT or read online on Scribd
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bio

Pre-Fertilisation: Structures and Events


The male and the female reproductive structures in flowers, the androecium and the
gynoecium, differentiate and further undergo development. Discussed below are the
male and female parts in brief:

At maturity, a typical angiosperm embryo sac, although it depicts 8-nucleated but


is 7-celled.
Stages of Sexual Reproduction in Flowering Plants
Based on the presence of either stamen or pistil or both, a flower can be
classified as unisexual or bisexual. Sexual reproduction in Flowering plants is
divided into three stages:

Pollination
Pollination is a process of transferring the pollen grains across the anther and
the stigma of the same flower of a plant or to a flower of different plants for the
process of fertilisation and the production

65,524
Formation of Fruits and Seeds
After the formation of a zygote, it is allowed to develop in an embryo. The ovules
develop into seeds and the ovary develops into a fruit. The ultimate product of
sexual reproduction is seeds, in angiosperms. Typically formation of seeds takes
place within fruits. Seeds are advantageous structures in the following ways:

The process of seed formation is dependable as other reproductive


processes(fertilisation and pollination) are water-dependent.
For dispersal to newer habitats, seeds have a better adaptive strategy helping
species to colonize other areas.
Young seedlings are self-nourished until photosynthesis, as they have enough food
reserves.
Generates new genetic combinations resulting in variations.
Seeds(dormant and dehydrated) can be stored for usage throughout the year.
Check out: Biology Revision Notes For Class 12 Chapter 2 Sexual Reproduction in
Flowering Plants

Few Important Questions


What is pollination?
What is the function of the ovaries in a flowering plant?

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