Question

(i) Identify the above structure and mention its location in a flower. (ii) Label the parts numbered 1 and 2. (iii) Explain the term ‘Double Fertilisation’. (iv) What is the fate of the calyx and corolla after fertilisation? (v) Draw a neat, labelled diagram of a pollen grain.

Answer 1

1)It is an ovary .It is present in pistil.

2)1-Antipodal cells

2-Polar nuclei

3)a)The sperm nucleus fuses with the egg cell nucleus.

b)The other sperm nucleus fuses with two polar nuclei of central cell.

4)They fall off as they have no more protective function in flower.

Answer 2

1)It is an embryo sac present in ovule.

2) Antipodal cells

Polar nuclei

3)One sperm nucleus fuses with egg cell and other sperm nucleus fuses with polar nuclei of central cell.

4)Calyx either fall of either remain corolla fall of as they have no more protective function in flower.