The diagram above is an illustration of two plants P and Q. Arrows I, II and III illustrate the transfer of pollen grains among flowers of plants P and Q. Studly it and answer questions 17 and 18.
The types of pollination illustrated as I,Il and III, respectively are
I - Self pollination
II - Self pollination
III - Cross pollination
Self-pollination occurs when pollen grains are transferred from anther to the stigma within the same flower(as seen in I) or plant(as seen in II), while cross-pollination occurs when pollen grains are transferred from the anther of a plant to the stigma of another plant of the same species(as seen in III).
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