Page 113 - SUBSEC October 2017_Neat

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Item 25 refers to the diagram below which Item 28 refers to the diagram below which
shows a germinating pollen grain and a shows the levels of various hormones
mature ovule. involved in the menstrual cycle in human
females.

28. Which ONE of the following is the most
25. The nucleus which fuses with the male
accurate deduction that can be made from
nucleus to form the zygote is
the diagram?
(A) A
(A) Q at high concentrations
(B) B
stimulates Y.
(C) C
(B) P at high concentrations
(D) D
stimulates Y.
(C) P at low concentrations
Item 26 refers to the following stages in the stimulates X.
development of human sperm. (D) Q at low concentrations
inhibits X.
I. Spermatid
II. Spermatogonium
III. Primary Spermatocyte 29. The MAIN function of the placenta in
humans is that it

26. Which of the following combinations is the (A) protects the embryo
correct order of sperm formation? (B) separates foetal and maternal blood
(C) allows exchange of materials
(A) I, II, III between foetus and mother
(B) II, III, I (D) supports the embryo
(C) II, I, III
(D) I, III, II
30. All of the following are able to cross the
placenta EXCEPT
27. The function of interstitial cells (cells of
Leydig) is the production of (A) E. coli bacterium
(B) Human Immuno-Deficiency Virus
(A) oestrogen (C) carbon monoxide
(B) progesterone (D) alcohol
(C) follicle stimulating hormone
(D) testosterone

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02107010/SPEC 2017

Item 31 refers to the following information.