Fusion of dissimilar gamete is:- (i) Allogamy (ii) Fertilization (iii) Autogamy (iv) Dichogamy

Question:
Fusion of dissimilar gamete is:- 

(i) Allogamy 

(ii) Fertilization 

(iii) Autogamy 

(iv) Dichogamy

Answer: option (ii) "Fertilization".

Explanation:

Cross-pollination in a crop plant is known as allogamy. Allogamy is defined as fertilization of ovum of a flower by the pollen of another flower on the different plant. The pollen is transferred from the anther of a male flower to the stigma of a female flower. Allogamy takes place because of the male and female part of a particular flower mature at a different time. Dichogamy is a condition when the stamens and pistils of a flower mature at different times to prevent self-fertilization. Autogamy is the phenomena of fusion of gametes produced from the same individual. It involves the transfer of pollen from the anther to the stigma of the same flower. It is avoided when the number of seed is less, or the produced pollen is not able to fuse and germinate with the ovule of the same flower or the produced pollen are not healthy. Fusion of dissimilar gametes is fertilization. It takes place during sexual reproduction where the male and female gametes fuse to form a zygote. 

Hence, the correct answer is option (ii) "Fertilization".