The top part $A$ of the flask-shaped reproductive organ $X$ in the flower of a plant secretes a sugary 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 $(i i)$ organ $Y$ , inside the flower?

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Solution

Organ $X$ is carpel and organ $Y$ is stamen inside the flower.

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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.

(e) What is the phenomenon of growing a long tube in response to a sugary substance in the process of fertilisation in a flower knows as?

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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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(e) What will happen if organisms A reach part F of the tooth?

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Organ X is carpel and organ Y is stamen inside the flower.

Organ $X$ is carpel and organ $Y$ is stamen inside the flower.