Practice MCQ Questions and answers on Biology-GK

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51.
Pigmentation of skin is due to

A. lymphocytes

B. monocytes

C. leucocytes

D. melanocytes

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52.
Norepinephrine increases

A. respiration

B. urine production

C. saliva production

D. blood pressure

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53.
Night blindness is cause by lack of which vitamin?

A. Vitamin A

B. Vitamin B

C. Vitamin C

D. Vitamin D

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54.
Monocot root differs from dicot root in having

A. open vascular bundles

B. scattered vascular bundles

C. well developed pith

D. radially arranged vascular bundles

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55.
Radioactivity is a phenomenon of the spontaneous emission of

A. protons (alpha particles)

B. electrons (beta particles)

C. gamma rays (short wave electromagnetic waves)

D. All of the above

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Practice MCQ Questions and answers on Biology-GK

51. Pigmentation of skin is due to

Answer & Solution

52. Norepinephrine increases

Answer & Solution

53. Night blindness is cause by lack of which vitamin?

Answer & Solution

54. Monocot root differs from dicot root in having

Answer & Solution

55. Radioactivity is a phenomenon of the spontaneous emission of

Answer & Solution

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51.
Pigmentation of skin is due to

52.
Norepinephrine increases

53.
Night blindness is cause by lack of which vitamin?

54.
Monocot root differs from dicot root in having

55.
Radioactivity is a phenomenon of the spontaneous emission of