Pollination is the process of transfer of pollen grains from the anther of a stamen to the stigma of a carpel of a flower.
The transfer of pollen grains from the anther of a flower to the stigma of the same flower or another flower on the same plant is called self-pollination. Examples: Wheat, tobacco, pea etc.
Autogamy: Transfer on the same flower.
Geitonogamy: Transfer on different flowers of the same plant.
Xenogamy: Transfer between same kind of flowers on different plants.
- Bisexuality, monoecious
The transfer of pollen grains from the anther of a flower on one plant to the stigma of a flower on another plant of the same species is called cross-pollination. Examples: Hibiscus, china rose, brinjal etc.
Also Read Respiration in Plants
|Agent||Method||Examples of plants|
|Insect||Entomophily||Sweet pea, Dahlia|
|Butterfly||Psychophily||Asclepias tuberosa, Echinacea purpurea|
|Moth||Phalaenophily||Liatris spicata, Camassia scillioides|
|Habenaria obtusata, Trichopoda sp.|
|Beetle||Cantharophily||Pond lily, Magnolia|
|It is the transfer of pollen grains from the anther to the stigma of the same|
|It is the transfer of pollen grains from the anther of one flower to the stigma of another flower of a different plant of the|
|It does not require any external agent,|
such as wind, water or insects to
carry out pollination.
|It requires an external agent for pollination to occur.|
|It can take place even when the|
flower is closed.
|It can occur only when the flower is|
|In self-pollinated flowers, the anther|
and stigma mature at the same time.
|In cross-pollinated flowers, the anther|
and stigma mature at different times.
|It preserves parental characters.||It does not preserve parental characters.|
|New varieties cannot be produced.||New varieties can be produced|
|As new variations are not possible,|
the off-springs cannot adapt to
changing environmental conditions.
|As new variations are possible, the offspring are healthier and are able to adapt to changing environmental|
Fertilization~ Read here