Which among the following statement is incorrect ?

a-Formation of the diploid zygote is universal in all asexually reproducing organisms.

b-In organisms with external fertilisation, zygote is formed in the external medium (usually water).

c-Zygote is the vital link that ensures continuity of species between organisms of one generation and the next.

d-Embryogenesis refers to the process of development of embryo from the zygote.

only a

The correct answer is Option (3) - only a

Formation of the diploid zygote is universal in all sexually reproducing organisms.

In organisms with external fertilisation, zygote is formed in the external medium (usually water), whereas in those exhibiting internal fertilisation, zygote is formed inside the body of the organism. In most aquatic organisms, such as a majority of algae and fishes as well as amphibians, syngamy occurs in the external medium (water), i.e., outside the body of the organism. This type of gametic fusion is called external fertilisation.

Zygote is the vital link that ensures continuity of species between organisms of one generation and the next. Every sexually reproducing organism, including human beings begin life as a single cell–the zygote.

Embryogenesis refers to the process of development of embryo from the zygote. During embryogenesis, zygote undergoes cell division (mitosis) and cell differentiation.