Question

When an insect sits on the flower of a plant then somene 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.

1. 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?
2. What is the name of tube B?
3. What is C which moves down through the tube B?
4. Name D and E.
5. What is F?

Answer 1

1. A: Pollen grains. The process of transferring pollen grains from one flower to another flower of the same species by an insect is called cross-pollination.
2. B: Pollen tube
3. C: Male gamete (male nucleus)
4. D: Egg cell (female gamete) and E: Ovule
5. F: Zygote