Question

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.

1. Name parts (i) organ X, and (ii) organ Y, inside the flower?
2. Name parts (i) A (ii) B, and (iii) C, of flask-shaped organ.
3. Name (i) grain D, and (ii) part E of organ Y.
4. Name the tube F.
5. What is the phenomenon of growing a long tube in response to sugary substance in the process of fertilisation in a flower known as?

Answer 1

1. (i) X is the carpel and (ii) Y is the stamen.
2. (i) A is the stigma, (ii) B is the style and (iii) C is the ovary of the flask-shaped organ.
3. (i) D is the pollen and (ii) E is the anther.
4. F is the pollen tube.
5. 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.