MCQ practice · SSC Biology Board questions · Chapter 11: Reproduction in Organisms
After how many weeks do the heartbeat and brain of the embryo begin to form?
Think it through first, then pick an option.
- a 4 weeks
- b 5 weeks
- c 7 weeks
- d 28 weeks
Answer and explanation
Correct answer: a 4 weeks
After 4 weeks the embryo floats in fluid and the heartbeat and brain begin to form.
Why the other options are wrong
- b 5 weeks: At 5 weeks limb buds form; the heartbeat and brain start to develop at 4 weeks.
- c 7 weeks: 7 weeks is not in the book; the book says the heartbeat and brain begin at 4 weeks.
- d 28 weeks: At 28 weeks the foetus is complete, which is long after the beginning.
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