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Biology 22

The document describes three types of pollination: autogamy (self-pollination within the same flower), geitonogamy (pollen transfer between flowers of the same plant), and xenogamy (pollen transfer between different plants). It also outlines the types of pollinating agents, which include abiotic factors like water and air, and biotic factors such as insects, birds, and animals. Additionally, it highlights zoophily, a form of pollination involving animal transfer of pollen, which has led to the evolution of attractive floral traits to entice pollinators.

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30 views12 pages

Biology 22

The document describes three types of pollination: autogamy (self-pollination within the same flower), geitonogamy (pollen transfer between flowers of the same plant), and xenogamy (pollen transfer between different plants). It also outlines the types of pollinating agents, which include abiotic factors like water and air, and biotic factors such as insects, birds, and animals. Additionally, it highlights zoophily, a form of pollination involving animal transfer of pollen, which has led to the evolution of attractive floral traits to entice pollinators.

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abi19042007
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We take content rights seriously. If you suspect this is your content, claim it here.
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AUTOGAMY

Self pollination is also known as autogamy . The


transfer of pollen grains from the anther of a
flower to the stigma of the same flower or
another flower of the same plant is known as self
pollination.
GEITNOGAMY
In geitonogamy the transfer of pollen grains from the anther of one flower to the
stigma of another flower of the same plant takes place. As the pollen grains
transferred are genetically similar, it is similar to autogamy. It is functionally
cross-pollination because pollinating agents are required. It involves the
transfer of genetically similar pollen grains to the stigma, hence offspring are
similar to the parent and show less variation and lead to inbreeding depression.
XENOGAMY
Xenogamy is a type of allogamy. It involves the transfer of pollen grains
from the anther of one plant to the stigma of another plant. It is a type
of cross pollination. Pollinating agents are required for this type of
pollination. It involves the transfer of genetically different pollen grains
to the stigma
TYPES OF POLLINATING AGENTS
ABIOTIC BIOTIC

1)WATER 1)INSECTS
2)AIR 2)BIRDS
3)ANIMALS
Zoophily, or zoogamy, is a form of pollination whereby pollen is
transferred by animals, usually by invertebrates but in some
cases vertebrates particularly birds and bats but also by other
animals. Zoophilous species frequently have evolved mechanisms
to make themselves more appealing to the particular type
of pollinator e.g. brightly colored or scented flowers, nectar and
appealing shapes and patterns.

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