List two reasons.for the appearance of variations among the progeny formed by sexual reproduction.

Question

(a) List two reasons.for the appearance of variations among the progeny formed by sexual reproduction.
(b) (i) Name the part marked'A'in the diagram alongside.
     (ii) How does 'A'reaches part'B' ?
     (iii) State the importance of the part 'C'.
 (iv) What happens to the part marked 'D' after fertilisation is over ?

Answer 1

(a) Variation is seen among progeny formed by sexual reproduction because of:
(i) Involvement of two different individuals.
(ii) Creation of new combination of variants.
(b) (i) A-pollen or pollen grain.
(ii) It reaches the stigma (B) by agents of pollination.
(iii) C (pollen tube) helps male gamete to reach the egg (ovule).
(iv) After fertilsation it converts into embryo.