Question:
The blastocyst stage of development is reached by the end of ___________ day.
The blastocyst stage of development is reached by the end of ___________ day.
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The blastocyst stage is reached by about the fifth day after fertilisation.
Updated On: Nov 13, 2026
\(5^{\text{th }}\)
\(6^{\text{th }}\)
\(7^{\text{th }}\)
\(8^{\text{th }}\)
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
After fertilisation, the zygote divides repeatedly by cleavage.
Step 2: Stages
Morula forms and then changes into a blastocyst.
Step 3: Compare the options
The blastocyst stage is reached by the end of the \(5^{\text{th}}\) day.
Final Answer:
The blastocyst is reached by the 5th day. \[ \boxed{\text{(A) }5^{\text{th}}} \]
After fertilisation, the zygote divides repeatedly by cleavage.
Step 2: Stages
Morula forms and then changes into a blastocyst.
Step 3: Compare the options
The blastocyst stage is reached by the end of the \(5^{\text{th}}\) day.
Final Answer:
The blastocyst is reached by the 5th day. \[ \boxed{\text{(A) }5^{\text{th}}} \]
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