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(i) Name the special tissue inside the uterus that provides nutrition to the developing embryo. Describe its structure. State its two functions besides nutrition.
(ii) Write any two sexually transmitted diseases in humans and their causative microbial agents.
(ii) Write any two sexually transmitted diseases in humans and their causative microbial agents.
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(i)
$\bullet$ Placenta (1 Mark)
$\bullet$ This is a disc which is embedded in the uterine wall. It contains villi on the embryo side of the tissue. On the mother's side are blood spaces which surround the villi. (1 Mark)
Functions:
$\bullet$ Removes wastes produced by embryo. ($\frac{1}{2}$ Mark)
$\bullet$ Provides a large surface area for oxygen to pass from mother to embryo. ($\frac{1}{2}$ Mark)
(ii)
Name of the disease: Gonorrhoea / Syphilis, Microbial agent: Bacteria (1 Mark)
Name of the disease: Warts / HIV – AIDS, Microbial agent: Virus (1 Mark) (any other)
$\bullet$ Placenta (1 Mark)
$\bullet$ This is a disc which is embedded in the uterine wall. It contains villi on the embryo side of the tissue. On the mother's side are blood spaces which surround the villi. (1 Mark)
Functions:
$\bullet$ Removes wastes produced by embryo. ($\frac{1}{2}$ Mark)
$\bullet$ Provides a large surface area for oxygen to pass from mother to embryo. ($\frac{1}{2}$ Mark)
(ii)
Name of the disease: Gonorrhoea / Syphilis, Microbial agent: Bacteria (1 Mark)
Name of the disease: Warts / HIV – AIDS, Microbial agent: Virus (1 Mark) (any other)