cleistogamy can favour only autogamy. justify the statement????

in a flower reproducing by cleistogamy the reproductive organs are kept intact inside the flower i.e. they are not exposed and the flower is of closed type. Due to this, the pistil and pollen grains have to reproduce by self only with each other i.e. autogamy bcoz no external agents could let the external pollens to enetr the closed flowers. Hence we can say that cleistogamy can favour only autogamy. 
hope it helps.
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