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1.
In mammals, the organ which deaminates excess amino acid to form urea is the
kidney
liver
pancreas
spleen
2.
The pigment in the skin responsible for skin colouration is
xanthophyll.
melanin.
velamin.
carotene
3.
The largest excretory organ of the human body is the
liver.
skin.
pancreas.
lungs.
4.
The term used to describe all chemical reactions occurring inside an organism is
metabolism.
condensation.
oxidation.
polymerization.
5.
The largest excretory organ of the human body is the
liver.
skin.
pancreas.
lungs.
6.
Substances excreted by the skin of humans include
salts and water only
urea and salts only
water and urea only
salts, urea and water only
7.
Which of the following statements about metabolic activity in plants is not correct?
The rate is slower than in animals of similar weight.
Its waste products accumulate more slowly than in animals.
Waste products are stored in certain parts of the plant.
Waste products include urea.
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