Question

Correct sequence in embryonic development of frog is :

• A. Zygote $\to$ Cleavage $\to$ Blastula $\to$ Gastrula
• B. Zygote $\to$ Cleavage $\to$ Gastrula $\to$ Blastula
• C. Cleavage $\to$ Zygotes $\to$ Blastula $\to$ Gastrula
• D. Zygote $\to$ Blastula $\to$ Cleavage $\to$ Gastrula

Answer 1

Answer: (A)

In frog the zygote after about two and a half hours of fertilization undergo long series of changes involving repeated mitotic cell division, cell growth and differentiation, formation of tissues and organs develops into a larval form called tadpole. The sequential stages of divisions are-Early cleavage -> Morula $\to$ Blastula $\to$ Gastrula stage $\to$ stage of 3 primary germ layers $\to$ organogeny $\to$ Formation of tadpole.