Pollination is required for fertilization and the production of seeds. How do you think pollination takes place? How do pollen grains reach the sitgma? What carries pollen to the stigma?
Plants and Animals, Partners in Pollination
Most plats are pollinated by insects, birts, or even the wind. Are these on your list? The majority of plants are insect pollinated. They are attracted to plants by pretty colors and sweet scents.
The most commonly known pollinator is the bee. Their principal activity is to produce and store honey to feed their larvae. To be able to produce it, they collect nectar from the flowers. When a bee lands on the flower, the pollen clings to the fine hairs on its body. As it moves from flower to flower, bits of the pollen are rubbed off adn more is collected.
Pollination and Fertilization
Pollination is the transfer of pollen from one plant to
another, while fertilization is the fusion of male and female
gametes. Both are natural processes that occur in flowering plants.
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Pollination
- Occurs
outside the body of the plant
- Can
be accomplished by wind, water, or insects
- Can
be self-pollination or cross-pollination
- Self-pollination
can be autogamy or geitonogamy
- Cross-pollination
increases variation in a species
Fertilization
- Can
occur internally or externally
- Involves
the fusion of male and female gametes
- Results
in the formation of seeds
- In
flowering plants, double fertilization occurs
Process
- Pollen
is transferred from the anther to the stigma
- The
pollen grain germinates and grows a pollen tube
- The
pollen tube carries male gametes to the egg cell in the ovule
- One
sperm fuses with the egg, and the other fuses with the polar nuclei
- The
zygote grows into an embryo and then a new plant
Successful pollination can lead to fertilization, but it is
not guaranteed.
Self Pollination and Cross Pollination
Self Pollination can occur within the same flower plant.
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