The correct answer is (c) (i), (ii) and (iii).
Explanation:
(i) It requires two types of gametes:
This is true. In sexual reproduction, a male gamete (pollen grain) and a female gamete (egg) are needed to fuse and form a zygote.
(ii) Fertilization is a compulsory event:
Yes, for sexual reproduction to occur, the male and female gametes must fuse, which is called fertilization.
(iii) It always results in the formation of a zygote:
When the male and female gametes fuse, they form a zygote.
(iv) Offspring formed are clones:
This is false. Sexual reproduction results in genetic diversity in the offspring because the gametes from two different individuals combine, leading to variations. Clones are genetically identical to the parent organism, which is not the case with sexual reproduction.
Why other options are incorrect:
(a) (i) and (iv): While statement (i) is true, (iv) is false. Clones are genetically identical to the parent organism, but sexual reproduction produces genetically diverse offspring.
(b) (i), (ii) and (iv): Statement (iv) is false for the same reasons explained in option (a).
(d) (i), (ii) and (iv): Statement (iv) is false. The correct answer is (c) because only statements (i), (ii), and (iii) are true.