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 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.
(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 a sugary substance in the process of fertilisation in a flower known as?

(a) (i) Organ X is the carpel (female reproductive organ) inside the flower, and

(ii) Organ Y is the stamen (a male reproductive organ) inside the flower.

(b) (i) A is the stigma,

(ii) B is the style, and

(iii) C is the ovary of the flask-shaped organ.

(c) (i) Grain D of organ Y is the pollen, and

(ii) Grain E of organ Y is the anther.

(d) Tube F is the pollen tube.

(e) The phenomenon of growing a long tube in response to a sugary substance in the process of fertilisation in a flower is known as chemotropism.

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Updated on: 24-Mar-2023

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