The flask-shaped organ A at the centre of a flower is surrounded by a number of little stalks B having swollen tops which lie just inside the ring of petals.

(d) What does the swollen top of B contain?

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Solution

Pollen grains are present in the swollen top of stamen (B), i.e., the anther. The pollen grains contain the male gametes in them.

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The flask-shaped organ A at the centre of a flower is surrounded by a number of little stalks B having swollen tops which lie just inside the ring of petals.
(a) Name A. What are the various parts of A?
(b) Which part of A contains gametes?
(c) Name B. What is the swollen top of B known as?
(d) What does the swollen top of B contain?
(e) Out of A and B, which one is (i) male part, and (ii) female part of the flower?

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?

The flask-shaped organ A at the centre of a flower is surrounded by a number of little stalks B having swollen tops which lie just inside the ring of petals.

(a) Name A. What are the various parts of A?

The flask-shaped organ A at the centre of a flower is surrounded by a number of little stalks B having swollen tops which lie just inside the ring of petals.

(b) Which part of A contains gametes?

The flask-shaped organ A at the centre of a flower is surrounded by a number of little stalks B having swollen tops which lie just inside the ring of petals.

(e) Out of A and B, which one is (i) male part, and (ii) female part of the flower?

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The flask-shaped organ A at the centre of a flower is surrounded by a number of little stalks B having swollen tops which lie just inside the ring of petals. ​ (d) What does the swollen top of B contain?

​Pollen grains are present in the swollen top of stamen (B), i.e., the anther. The pollen grains contain the male gametes in them.

The flask-shaped organ A at the centre of a flower is surrounded by a number of little stalks B having swollen tops which lie just inside the ring of petals.

(d) What does the swollen top of B contain?

Pollen grains are present in the swollen top of stamen (B), i.e., the anther. The pollen grains contain the male gametes in them.