Many plants are polinated by insects like bees, flies, butterflies, hummingbirds, etc. Others are wind pollinated. For more information, refer to the link below:
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A plant is pollinated by the transferring of pollen from the anthers of the flower to the stigma of the same flower or another flower. Once a flower is pollinated, it can become fertilized, when the nuclei of the pollen is fused with the nuclei in the ovule. Once fertilization happens, the plant can form seeds. Some plants can self-pollinate, in which pollen and pistil can be of the same plant for fertilization, but others must cross-pollinate, where pollen and pistil must each be from different plants. Some plants need pollinators like insects or animals to get their pollen transferred to the stigma of other flowers, while other plants get their pollen transferred by wind and/or water.
Pollination is the transport of pollen from the male parts of the plant to the female parts, culminating in a seed and fruit. Given that the flowers themselves are immobile, they are entirely dependant on various insects and birds to carry the pollen to other plants of the same species. Additionally, “some flowers open at special times to attract pollinators such as night blooming plants that are pollinated by bats.” Flowers utilize any evolutionary advantage to make sure their pollen is spread frequently and widely enough.
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