Some insects buzz around and sit on flowers which have a scent. Of what use could this be to the plant?

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Solution

The insects are attracted to the scent of the flower. When these insects buzz and sit on the flowers, the pollen grains from the flowers stick to them and thus get transferred to another flower. This process is called pollination which is a mode of reproduction in plants.

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When an insect sits on the flower of a plant then some particles A present in the top of little stalks in the flower attached 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 the flower. The particle, A grows a long tube B from the top of a flask-shaped organ through which C moves down and reaches the bottom part of the 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 the 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?

Q. It is known that some varieties of wheat are sown in autumn but are harvested around next mid summer.
(a) what could be the probable reason for this.
(b) What term is used for this promotion of flowering under low temperature?

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