MHT CET · BIOLOGY · STD 12 - 2. Reproduction in Lower and Higher Animals

Human embryo is solid ball of 16-32 cells by the end of _________ day after fertilization.

A \(4^{\text {th }}\)
B \(3^{\text {rd }}\)
C \(5^{\text {th }}\)
D \(6^{\text {th }}\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(4^{\text {th }}\)

Step-by-step Solution

Detailed explanation

By the end of 4th day after fertilization, embryo is a solid ball of 16-32 cells and externally looking like mulberry. This stage is called morula.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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