The top part A of the flask-shaped reproductive organ X in the flower of a plant secrets a surgery substance into its lower part B which goes towards the bottom part C of the flask-shaped organ. When a tiny grain D coming from the top part E of another reproductive organ Y in the flower falls on part A, it grows a long tube F through the organ X in response to the sugary substance and reaches the bottom part C of flask-shaped organ to carry out fertilisation.
(a) What is (i) organ X, and (ii) organ Y, inside the flower?
(b) Name parts (i) A (ii) B, and (iii) C, of flask-shaped organ.
(c) Name (i) grain D, and (ii) part E of organ Y.
(d) Name the tube F.
(e) What is the phenomenon of growing a long tube in response to sugary substance in the process of fertilisation in a flower known as?

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Solution

(a) Organ X is carpel and organ Y is Stamen.

(b) (i) A - Stigma
(ii) B - Style
(iii) C - Ovary

(c) (i) Pollen grain
(ii) Anther
(iii) Pollen tube

(d) The tube F is pollen grain.

(e) This phenomenon is called chemotropism.

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The top part A of the flask-shaped reproductive organ X in the flower of a plant secretes a surgery substance into its lower part B which goes towards the bottom part C of the flask-shaped organ. When a tiny grain D coming from the top part E of another reproductive organ Y in the flower falls on part A, it grows a long tube F through the organ X in response to the sugary substance and reaches the bottom part C of the flask-shaped organ to carry out fertilisation.

(a) What is (i) organ X, and (ii) organ Y, inside the flower?

(b) Name parts (i) A (ii) B, and (iii) C, of a flask-shaped organ.

(d) Name the tube F.

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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.
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(b) What is the name of tube B?
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(d) Name the part F of the tooth.
(e) What will happen if organisms A reach part F of the tooth known?

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(a) Organ X is carpel and organ Y is Stamen. (b) (i) A - Stigma (ii) B - Style (iii) C - Ovary (c) (i) Pollen grain (ii) Anther (iii) Pollen tube (d) The tube F is pollen grain. (e) This phenomenon is called chemotropism.

(a) Organ X is carpel and organ Y is Stamen.

(b) (i) A - Stigma
(ii) B - Style
(iii) C - Ovary

(c) (i) Pollen grain
(ii) Anther
(iii) Pollen tube

(d) The tube F is pollen grain.

(e) This phenomenon is called chemotropism.