Monday, July 15, 2019

'Pollination is an important phenomenon in the life cycle of a flowering plant.' discuss the statement and describe briefly about the role of different Agencies responsible for the events.

Without pollination fertilization cannot takes place. And without fertilization fruits and seeds are not formed. Therefore pollination is essential for not as production of fruits and seeds but also for continuity of species through sexual reproduction essentially a part of sexual reproduction in plants.
        Pollination is the only method without which sexual reproduction cannot take place. Pollen grains donate male gametes. The union of male and female gametes restore diploid chromosome number in a species. There is essential for continuity of the species. Pollen grains reach the stigma by various methods revised suitably by each species.
       Plants evolved various mechanisms for carrying but pollination. Morphology of the flowers have been adapted according to the nature and morphdrogy of the pollinating agents.
      Nature favours cross pollination and their flowers adapt themselves in various ways so that various natural agents of pollination,

The natural agents involved in pollinations are:

1.insect:

Pollination done by insects is called entomophily and the insect pollinated flower is called entomophilous flowers. The insect loving flowers of various adaptation by which the attract insects and use them as can be lots of pollen grains for pollination for insect pollination flowers must be.

     A.conspicuousness:

When flowers are small they aggregate into inflorescence to become conscious which then can attract insects.

     B.coloured:

Coloured and large showy flowers have great attraction for butterflies bees and other types of insects.

       C.have necter:

Nectar has special attraction for bees. Many types of flowers are equipped with nectar glands which secrete nectar at the base of Corolla.

     D.scented:

Nocturnal flowers generally failssweet scent and which attracts insects at hight when colour fails to attract them.

     E. Have sticky pollen grains:

The pollen grains of entomophilous flowers are generally either sticky or a provided with spines so that the pollen grains can easily stick to the body of the insect and then carried by them easily.

2.isned:

Pollination is brought about by the wind in flowers which are small & inconspicious. They are not coloured or showy. Such flowers do not produce any scent or nectar.

3water:

Pollen grains of aquatic plants may be carried by water current and may get in touch with the stigma at the surface of water. All aquatic plants are not hydrophilus. Hydrophily is but the rule in submerged plants. The submerged plants generally lift their female flower to the surface of water for pollination.

4.animals:

Pollination may be brought about by various animals. 14 mission is done by bats it is called chiropterophily. Bombax,Bouhinia etc. Plants pollinated by bats. pollination in plants like erythrina, Bombax, bignonia etc.are Brought about by Birds, squirrels etc. Pollination by birds is called ornithophily. Pollination in Aroids are caused by snails. Such pollination is generally called malacophily.

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