Exercise 11.2
Arrange the following stages of sexual reproduction in plants in the correct order: (i) Pollen germination on stigma (ii) Fertilisation (iii) Pollination
Not cross-checked
NCERT prints no numerical answer for this exercise, so this working has not been cross-checked against the book.
NCERT’s answer
Correct sequence is (iii), (i), (ii), (iv)
Correct order: (iii) → (i) → (ii) → (iv).
(iii) Pollination — pollen grains are first transferred from the anther to the stigma; nothing else can begin until the pollen has arrived.
(i) Pollen germination on stigma — on a compatible stigma the pollen grain germinates and puts out a pollen tube, which grows down through the style into the ovary.
(ii) Fertilisation — the male gamete travels down that tube to the ovule and fuses with the egg cell.
(iv) Formation of zygote — the fertilised egg produced by that fusion is the zygote, which later develops into the embryo while the ovule becomes the seed and the ovary the fruit.