Question

define pollination explain the type of pollination list two agents of pollination


any one pls, give ans in easy way...​

Answer 1

$\bold{Define\:Pollination}$

=]] The process by which plant pollen is transferred from the male reproductive organs to the female reproductive to form seeds.

$\bold{Types\:of\:Pollination:-}$

There are 2 types of pollination and they are ⬇

●$\underline\bold{Self\:pollination:-}$ It is a transfer of pollen from the anthers to the stigma of the same and another flower.

●$\underline\bold{Cross\:pollination:-}$ It is a transfer of pollen from one flower to the stigma of another flower.

$\huge\bold{Agents:-}$

Pollination agents are animals such as insects , bats etc.

Answer 2

Pollination: Types and Agents Biology

Types of Pollination:

The transfer of pollen grains from the opened anther of the stamen to the receptive stigma of the carpel/pistil is called pollination. Each pollen grain grows and provides two male gametes for fertilisation of an ovule.

Depending upon the source of pollen grain, pollination is of three types:

1. Autogamy (Self-pollination):

It is the kind of pollination in which the pollen from the anthers of a flower is transferred to the stigma of the same flower, e.g., wheat, rice, pea, etc.

Autogamy is further classified as:

(i) Cleistogamy In some plants, flowers never open up and the anthers dehisce inside these closed flowers to ensure pollination. Thus, cleistogamous flowers are invariably autogamous as there is no chance of cross-pollination. These flowers produce assured seed sets even in the absence of pollinators, e.g., Oxalis, Viola, etc

(ii) Homogamy In this method, both the anthers and the stigma mature at the same time, e.g., Mirabilis.

2. Geitonogamy:

It is a kind of pollination where the pollen grains from the anther of the flower are transferred to the stigma of another flower borne on the same plant but at different branches. It usually occurs in plants, which show monoecious condition, e.g., Cucurbita.

3. Xeno-gamy (Cross-Pollination):

It involves the transfer of pollen grains from the flower of one plant to the stigma of the flower of another plant. This is the only type of pollination which brings genetically different types of pollen grains to the stigma during pollination, e.g., papaya, maize, etc.

Agents of Pollination:

The agents responsible for pollination in angiosperms have been grouped into two main categories.

Agents of Pollination

Adaptations for Wind Pollination:

Wind pollination is also termed as anemophily and takes place through the wind.

i. Flowers are small, colourless, inconspicuous, nectar less and become arranged as inflorescence.

ii. The anthers are well exposed for the easy dispersal of pollen grains.

iii. Pollen grains are small, light, dry, dusty, non-sticky and sometimes even winged.

iv. The stigmas are large, hairy and feathery or branched to catch the air borne pollen grains.

v. Common examples of wind pollinated flowers are grass, sugarcane, bamboo and coconut, etc.