Question

Match the column I with column II.

Column I	Column II
(P) External fertilisation	(i) Earthworm
(Q) Internal fertilisation	(ii) Cockroach
(R) Bisexual	(iii) Frogs and Fishes
(S) Unisexual	(iv) Birds and mammals

• A. $P-\left(iv\right),Q-\left(iii\right),R-\left(i\right),S-\left(ii\right)$
• B. $P-\left(iv\right),Q-\left(iii\right),R-\left(ii\right),S-\left(i\right)$
• C. $P-\left(iii\right),Q-\left(iv\right),R-\left(ii\right),S-\left(i\right)$
• D. $P-\left(iii\right),Q-\left(iv\right),R-\left(i\right),S-\left(ii\right)$

Answer 1

The correct option is D $P-\left(iii\right),Q-\left(iv\right),R-\left(i\right),S-\left(ii\right)$

(i). Earthworm belongs to the phylum Annelida. It is hermaphrodite(bisexual). Self-fertilization is excluded by protandry, i.e., maturation of testes earlier than ovaries do.

(ii). Cockroach belongs to the phylum Arthropoda. In this sexes are separate and distinguishable externally( Sexual dimorphism).

(iii). Frog and Fishes: Sexes are separate. Fertilisation is external. Larva occurs in some cases.

(iv). Birds and mammals: There may be sexual dimorphism. Testes are paired. Fertilization is internal.

So, the correct answer is 'P-iii, Q- iv, R- i, S- ii'.