give example of self pollination and cross pollination
Self-pollination
Few plants self - pollinate without the aid of pollen vectors ( such as wind or insects ) . The mechanism is seen most often in some legumes such as peanuts . In another legume , soybeans , the flowers open and remain receptive to insect cross pollination during the day . If this is not accomplished , the flowers self - pollinate as they are closing . Among other plants that can self - pollinate are many kinds of orchids , peas , sunflowers and tridax . Most of the self - pollinating plants have small , relatively inconspicuous flowers that shed pollen directly onto the stigma , sometimes even before the bud opens . Self - pollinated plants expend less energy in the production of pollinator attractants and can grow in areas where the kinds of insects or other animals that might visit them are absent or very scarce -- as in the Arctic or at high elevations . 
Few plants self - pollinate without the aid of pollen vectors ( such as wind or insects ) . The mechanism is seen most often in some legumes such as peanuts . In another legume , soybeans , the flowers open and remain receptive to insect cross pollination during the day . If this is not accomplished , the flowers self - pollinate as they are closing . Among other plants that can self - pollinate are many kinds of orchids , peas , sunflowers and tridax . Most of the self - pollinating plants have small , relatively inconspicuous flowers that shed pollen directly onto the stigma , sometimes even before the bud opens . Self - pollinated plants expend less energy in the production of pollinator attractants and can grow in areas where the kinds of insects or other animals that might visit them are absent or very scarce -- as in the Arctic or at high elevations .
The self-pollinating  mechanism is seen most often in some legumes such as peanuts.
Other plants that can self-pollinate are many kinds of orchids, peas, sunflowers and tridax.
In soybeans , the flowers open and remain receptive to insect cross pollination during the day .
The mechanism is seen most often in some legumes such as peanuts . In another legume , soybeans , the flowers open and remain receptive to insect cross pollination during the day . Among other plants that can self - pollinate are many kinds of orchids , peas , sunflowers and tridax .