Pollination
Pollination
Pollination The transfer of pollen grains from the anther to the stigma is known as pollination. When the anthers grow and mature; they burst open and release pollen grains (male gametes). These pollen grains are then carried to the stigma (female part) of another flower (of the same type) by insects, birds, wind or water. Insects and birds visit flowers to collect nectar and they are called as pollinators. While collecting nectar from a flower, some pollen grains stick to their wings and legs and get transferred to the flower on which they sit. This transfer of pollen grains from one flower to another of the same kind is called pollination. The process of pollination can occur in two ways:
Cross-pollination: The transfer of pollen grains from the anther of one flower to the stigma of another flower of another plant of the same type is known as cross-pollination. Cross-pollination can be observed in plants of maize, coconut, grasses, etc.
Self-pollination: The transfer of pollen grains from the anther to the stigma of the same flower or to the stigma of another flower on the same plant, it is termed as self-pollination. It can be seen in pea, rice, wheat, etc.
Agents Of Pollination: - wind, water and insects.
Wind: Wind blows away pollen grains from the anthers of one flower to the stigma of another flower. Pollen grains are very light. E.g. wheat, rice and maize.
Water: Water pollinated flowers release their pollen grains into the water and slowly carried to other flowers by water currents. E.g. sea grass.
Insects: Some pollen stick to the body parts of the insect .when these insects visit another flower, the pollen grains fall on the stigma .e.g. sweet pea, orchids and jasmine.
Which of the following are correct ? (a) The transfer of pollen grains from the anther to the stigma is known as pollination. When the anthers grow and mature; they burst open and release pollen grains (male gametes). (b) The pollen grains are carried to the stigma (female part) of another flower (of the same type) by insects, birds, wind or water. (c) Insects and birds visit flowers to collect nectar and they are called as pollinators. | |||
| Right Option : D | |||
| View Explanation | |||
The migration of pollen grains to stigma is called as ___________________ | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct ? (a) The transfer of pollen grains from the anthers of a flower to the stigma of the same or another flower is known as pollination. (b) Cross-pollination is the transfer of pollen from the anthers of a flower to the stigma of a flower on another plant of the same species. (c) Wind-pollinated flowers produce light pollen grains which can be carried by the wind. This type of pollination is seen in plants like maple tree, grasses, dandelion etc. | |||
| Right Option : D | |||
| View Explanation | |||
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