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Date November 2018 Marks available 1 Reference code 18N.1.HL.TZ0.40
Level Higher level Paper Paper 1 Time zone TZ0 / no time zone
Command term Deduce Question number 40 Adapted from N/A

Question

If the ovaries of a pregnant woman have to be removed during the first five months of pregnancy, a miscarriage results and the pregnancy fails. If the ovaries are removed in the last four months of pregnancy, the miscarriage does not occur. What is the reason for this?

A.  After the fifth month, the ovaries can regenerate rapidly.

B.  The pituitary gland takes over the function of sustaining the pregnancy.

C.  The placenta produces sufficient hormones to sustain the pregnancy.

D.  Before removal the ovaries produce sufficient hormones to sustain the pregnancy.

Markscheme

C

Examiners report

[N/A]

Syllabus sections

Additional higher level » Topic 11: Animal physiology » 11.4 Sexual reproduction
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Additional higher level » Topic 11: Animal physiology
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