What is pollination ? How is it brought about ? Differentiate between self & cross pollination .
ransfer of pollen grains from the anther to the stigma of a flower by insects,water and wind is called pollination.pollination may be grouped as of 2 types- 1.self pollination 2.cross pollination self pollination-if the pollen grains land on the stigma of the same flower then it is called self pollination. cross pollination-if the pollen grains land on the stigma of the other flower or the flower of the same type is called cross pollination. without pollination fertilization could not take place.now the question arises how the pollen grains land on the stigma. so the answer is that stigma is sticky so that the pollen grains could land on them