Biology MCQs

1. Calcitriol is the biologically active form of which among the following Vitamins?
[A] Vitamin B
[B] Vitamin C
[C] Vitamin D
[D] Vitamin E

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2. Which among the following hormone can be used as a drug to treat cardiac arrest and some other cardiac problems?
[A] Thyroxin
[B] Epinephrine
[C] Calcitonin
[D] Insulin

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3. How many pairs of ribs are there in a human body?
[A] 10 pairs
[B] 12 pairs
[C] 14 pairs
[D] 16 pairs

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4. Calorie of Energy is equal to _________?
[A] .42 joule
[B] 4.2 joule
[C] 42 joule
[D] 0.042 Joule

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5. The enzyme Nitrite reductase has which of the elements as its constituent ?
[A] Molybdenum
[B] Copper
[C] Iron
[D] Zinc

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6. Calcium is required in plants in the formation of which of the following ?
[A] Cell Membrane
[B] Cell wall
[C] Cholorophyll
[D] None of the above

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7. What would happen if red blood cells were placed in distilled water?
[A] They would shrink and collapse
[B] They would stick together
[C] They would increase in volume and burst
[D] They would remain the same

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8. Which among the following is not a function of Sympathetic nerves in Autonomic nervous system?
[A] Enhancing the heart beats
[B] constricting the blood vessels
[C] dilate pupils
[D] contract urinary bladder

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9. Which of the following is the name given to the population of cells derived from a single parent cell? (UPSC Prelims 1989)
[A] Haploid
[B] Diploid
[C] Symmetrical cell
[D] Clone

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10. Consider the following conditions of sick human body
1. Swollen lymph nodes
2. Sweating at night
3. Loss of memory
4. Loss of weight
Which of these are the symptoms of AIDS? (UPSC Prelims 2003)
[A] 1 and 2
[B] 2, 3 and 4
[C] 1, 2 and 3
[D] 1, 2, 3 and 4

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