When an insect sits on the flower of a plant them some particles A present in the top of little stalks in the flower attach to its body hair. When this insect now sits on the flower of another similar plant, then particles A attached to the hair of insect are put on the top of a flask-shaped organ at the centre of flower. The particle A grows a long tube B from the top of flask-shaped organ through which C moves down and reaches the bottom part of flask-shaped organ. Here C fuses with the nucleus of D contained in structure E. the fusion of C and D forms a new cell F which grows and develops into a seed of the plant.
? (a) What are particles A ? What is the process of transferring A from one flower to another flower of similar plant by the insect of known as?
(b) What is the name of tube B?
(c) What is C which moves down through the tube
(d)Name D and E.
(e) What is F?

Answer

(a) A are pollen grains ; Cross pollination (b) F is fertilised egg (zygote)