The process of removal of metabolic wastes from the body is called: MCQ with Answer and Explanation

The process of removal of metabolic wastes from the body is called:
A. Respiration
B. Digestion
C. Circulation
D. Excretion
Answer: Option D
Solution (By JKSSB Mock Tests)
Excretion is the elimination of nitrogenous waste products (urea, uric acid, ammonia) and other metabolic wastes from the body, primarily by the kidneys. Digestion is breakdown of food, circulation is transport, respiration is gas exchange and energy release. Excretion maintains homeostasis of body fluids and prevents toxic accumulation.

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The finger-like projections in the small intestine that increase the surface area for absorption are:
A. Nephrons
B. Cilia
C. Villi
D. Alveoli

Correct Answer: Option C


Explanation:
Villi are microscopic finger-like projections on the inner lining of the small intestine, covered with microvilli (brush border), greatly increasing surface area for absorption of digested nutrients. Each villus contains a lacteal (lymph capillary) and blood capillaries. Alveoli are in lungs, nephrons in kidneys, cilia are hair-like projections on cells.

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The female reproductive structure where the embryo implants and develops is the:
A. Vagina
B. Ovary
C. Uterus
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Correct Answer: Option C


Explanation:
The uterus (womb) is a muscular organ where the fertilized egg implants in the thickened endometrium and develops into a fetus during pregnancy. The ovaries produce eggs, the fallopian tubes are the site of fertilization, and the vagina is the birth canal. The endometrium is shed during menstruation if no pregnancy occurs.

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The term for the water vapor loss from plant leaves is:
A. Evaporation
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Correct Answer: Option B


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