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Okay i havent checked the ms and im writing this answer from what i know
the flower shown there contains anthers and stigma of such a type that when anther is mature the stigma is not mature and is still developing,this as a result does not allow pollens from anther to pass into the stigma of the same flower but the insect has to help it in this process and when the stigma is mature as shown in the second figure the anthers have started to wear off !
Now for the part 2 the insect when only the anther is present is attracted by the nectar and when it reaches the flower the pollen grains from the mature anther stick to it and when it flies of to a nearby plant of the same species if the stigma there is mature the pollen grains stick onto the stigma and then pollination occurs while for stigma its the same process as i told but the insect comes to the flower with pollen grains stuck on it and then pollination occurs
I hope u get it
thanks alot it helped me thankss.........