When an insect sits on the flower of a plant then 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 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 known as?
(b)What is the name of tube B?
(c)What is C which moves down through the tube B?
(d)Name D and E.
(e)What is F?
(a) The particles A present in the top of little stalks in the flower and attach to insects body hair when it sits on the flower is pollen grain.
The process of transferring pollen grains from one flower to another flower of a similar plant by the insect is known as pollination.
(b) Tube B represents the pollen tube that grows from the pollen grain.
(c) C represents male gamete which moves down the pollen tube.
(d) Flask shaped organ represents ovary where C that is male gamete fuses with the nuclei of the D female gamete (or egg) in structure E which is ovule.
Therefore, D is female gamete or egg and E is ovule.
(e) The fusion of C and D, male gamete and female gamete forms zygote (F) which grows and develops into the seed of the plant. Thus, F is zygote.
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