Question

define pollination ​

Answer 1

$\bold{ \huge{ \underline{Pollination :-}}}$


=> Transfer of pollen grains from anther to stigma is called pollination.


=>Pollination maintain genetic diversity within a population.


=>Pollination is necessary for some plants or trees to grow fruit.


➡TYPES :-


$\bold{ \underline{Self - Pollination:-}}$


=> It occurs within the flower or between two flower or same plant's.


=>Plant's don't depend on other agencies for pollination.


=> Pollen grains produce in small number.


$\bold{ \underline{Cross - Pollination :-}}$


=> It occurs between two pants of different plant of same species.


=>Depend on other agencies for pollination like wind, water, insect.


=> Pollen grains are produces in large number.

Answer 2

$\bold{Pollination}$


→ The transfer of pollen grains from the anther to the stigma is called pollination .


→ This is the first step in the sexual reproduction of flowering plants .


→ When the anther matures , it bursts open to release pollen grains which are transferred to the stigma of the same flower or other flowers of the same species .


→ Pollination can be of two types - self pollination and cross pollination .



$\bold{Self \: \: - Pollination \: }$


→ When the Pollen is transferred from the anthers to the thickness of the same flower or of flowers borne by the same plant, the process is called self pollination .


→ Self pollination occur in flowers in which the anthers and stigmas mature at the same time .


→ Wheat, barley, oat and peach are some examples of self pollinating plants.


→ Self pollination also occurs in some flowers even before they open.


→ Some species of pansy, balsam, wood sorrel and sage are pollinated this way.


$\bold{Cross \: \: - Pollination}$


→ When the Pollen is transferred to the stigma of flowers of other plants of the same species, it is called cross-pollination .


→ Cross-pollination occurs in flowers in which the anthers and stigmas mature at different times, and those that have a barrier preventing self pollination.


→ Cross pollination also occurs in plants in which male and female flowers are borne by different plants.


→ Apple, date palm, willow and common primrose are some examples of cross pollinating plants .


$\bold{Notes } \: \colon -$


→ Various external agents, like the wind, certain animals and water, can carry pollen for self-made or Cross-pollination.


→ Most flowers are pollinated either by the wind or insects.


→ Other animals such as hummingbirds, bats and snails can carry out pollination too.


→ There are 4 extra types of pollination too.


❆ Wind Pollination

❆ Insect Pollination

❆ Water Pollination

❆ Artificial Pollination.