CBSE Class 10 Science 2020 · Paper 31/3/1 · Question 28(a)

(a) The diagram shows the pistil: pollen grains on the sticky stigma, a pollen tube growing from one pollen grain down through the style into the ovary, and an ovule in the ovary with the female germ cell inside it, which the tip of the pollen tube reaches. The four parts asked for are marked on it: pollen grain, pollen tube, stigma and female germ cell. (b) The pollen tube carries the male germ cell from the pollen grain on the stigma, through the style, to the ovule in the ovary, so that it can fuse with the female germ cell; without it, fertilisation cannot take place. (c) (i) The ovule develops into the seed. (ii) The ovary develops into the fruit.