1. Which of the following organs filters wastes from the blood?
[A]Heart
[B]Stomach
[C]Liver
[D]Kidneys
2. Urine flows from _____________________________.
[A]The stomach to the liver
[B]The liver to the stomach
[C]The kidney to the bladder
[D]The bladder to the kidney
3. The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason?
[A]Since the surface of the lake is at the same temperature as the air, no heat is lost.
[B]Ice is a bad conductor of heat
[C]The density of water is maximum at 4 degrees celsius
[D]None of the above
4. What is the study of antigen and antibodies found in blood called?
[A]Limnology
[B]Biology
[C]Serology
[D]Histology
5. Fruit ripening is accelerated by ________________.
[A]Methane
[B]Ethylene
[C]Propane
[D]Butane
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