(a)Pooter;
(b)Avoid insect being sucked into the mouth of sucker ;

.The gametes may not fuse at the right moment when female is on heat; Both male and female may be separated by distance or other natural obstacles;

(a)splitting of water molecule (H2O);into Hydrogen ions and Oxygen and ATP molecules using sunlight;
Rej : Hydrogen gas

(b)Importance of chloroplast/chlorophyll in photosynthesis ;