Question

Syngamy is the fusion between the nucleus of sperm and egg which fuses because of
(a) Hydrogen bonding
(b) Protoplasmic attraction
(c) Electrical polarities
(d) Compatibility of chemicals and attraction of nuclei

Answer 1

Hint: Syngamy involves the fusion of two nuclei that belong to the ovary and form an embryo by fertilization of the sperm cell with one of the egg cells. This fusion of cells is known as syngamy which is referred to as generative fertilisation or true fertilisation.

Complete answer:
Syngamy is the fusion between the nucleus of sperm and egg which fuses because of the compatibility of chemicals and the attraction of nuclei. Syngamy depends upon the fusion of gametes which takes place in two kinds which include self-fertilization or endogamy and cross-fertilization or exogamy. The process of self-fertilization involves the fusion of two forms of a gamete that come from the same parent and it is a very uncommon process that takes place in Taenia. The process of cross-fertilization involves the fusion of gametes which are derived from different parents and is a more general process that takes place in humans and cockroaches etc.
Syngamy is of three types which are isogamy, heterogamy and oogamy. Isogamy takes place when the gametes fused are similar to avoid the process of self-fertilization and the surface protein helps in recognising the different types of genotypes such as the cells of the immune system. Heterogamy page places when the gametes are of different sizes and oogamy takes place with the mobility of the gametes which are different from each other.

So, the correct answer is 'Compatibility of chemicals and attraction of nuclei'.

Note:
The concept of syngamy was proposed by Maynard Smith and Szathmary who defined syngamy through their successive revolutionary steps which involve a haploid diploid cycle. The result of syngamy is a diploid zygote which is the first cell of sporophytic generation.