BIOLOGY [2 Mark Question Answer]

Large size flower, brightly coloured, huge quantity of Nectar and directional pollination is characteristics of entomophilous flower. Pollination taking place by wind external means of agency is known as Anemophily and pollination taken place by insect external means of agency is known as entomophily.

After fertilization occurs, each ovule develops into a seed. Each seed contains a tiny, undeveloped plant called an embryo. The ovary surrounding the ovules develops into a fruit that contains one or more seeds.

Pollination is the transfer of pollen grains from an anther to a stigma. Pollen can be transferred by an animal or by the wind. Fertilisation takes place inside the ovary when the nucleus of pollen grain fuses with the nucleus of an ovule to produce a zygote.

The pollen tube of most seed plants acts as a conduit to transport sperm cells from the pollen grain, either from the stigma (in flowering plants or angiosperms) to the ovules at the base of the pistil, or directly through ovule tissue in some gymnosperms (conifers and gnetophytes).

Ovule
ovary wall
The outer surface of the ovule
Ovary

Pollination is a method where pollen grains are picked from an anther, which is the male part of a flower and transferred to the flower's female part called the stigma. To make the pollination work successfully, the pollen grains must be transferred from the same species of flower.

Sepals form the outermost whorl of the flower known as calyx. They are generally green in colour. Normally sepals fall off after fertilisation. Plants, where sepals remain attached to the fruit are tomatoes, strawberries, raspberries, brinjal, etc.

Examples of wind- pollinated flowers - Maize and Pine
Examples of water-pollinated flowers -Vallisneria and Hydrilla.
Examples of insect-pollinated flowers - Dahlia and Sweet pea.

Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma.
The major difference between pollination and fertilization is that pollination pollens transfer from one flower to another. Whereas, in fertilization takes place after pollination is transferred successfully.