Question

All multicellular organism start their life from a single cell called

• A. Zygote
• B. Egg cell
• C. Sperm
• D. None of the above

Answer 1

Answer: (A)

Zygote

All living organisms in their early developmental stages show the presence of following distinct features:

1) Development in sexually reproducing organisms begins from a single diploid cell stage that is a fertilized egg or zygote.

2) The zygote undergoes cleavage, blastulation, and gastrulation. At the end of gastrulation, three germ layers are formed which give rise to various organs and organ system.

Thus option A is the correct answer.