Which of the following is correct regarding AIDS causative agent HIV ?

Match Column-I with Column-II and select the correct option using the codes given below –

Column I	Column II
(a) Pistils fused together	(i) Gametogenesis
(b) Formation of gametes	(ii) Pistillate
(c) Hyphae of higher Ascomycetes	(iii) Syncarpous
(d) Unisexual female flower	(iv) Dikaryotic

Suppose the elements X and Y combine to form two compounds XY₂ and X₃Y₂. When 0.1 mole of XY₂ weights 10 g and 0.05 mole of X₃Y₂ weighs 9 g, the atomic weights of X and Y are

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because