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BIOLOGY MCQs

Total Questions : 2561 | Page 6 of 257 pages
Question 51. Pigmentation of skin is due to
  1.    lymphocytes
  2.    monocytes
  3.    leucocytes
  4.    melanocytes
 Discuss Question
Answer: Option D. -> melanocytes
Question 52. Norepinephrine increases
  1.    respiration
  2.    urine production
  3.    saliva production
  4.    blood pressure
 Discuss Question
Answer: Option D. -> blood pressure
Question 53. Monocot root differs from dicot root in having
  1.    open vascular bundles
  2.    scattered vascular bundles
  3.    well developed pith
  4.    radially arranged vascular bundles
 Discuss Question
Answer: Option C. -> well developed pith
Question 54. Night blindness is cause by lack of which vitamin?
  1.    Vitamin A
  2.    Vitamin B
  3.    Vitamin C
  4.    Vitamin D
 Discuss Question
Answer: Option A. -> Vitamin A
Question 55. Radioactivity is a phenomenon of the spontaneous emission of
  1.    protons (alpha particles)
  2.    electrons (beta particles)
  3.    gamma rays (short wave electromagnetic waves)
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 56. Organic Substances which, in very small amounts, control growth and development called
  1.    vitamins
  2.    hormones
  3.    enzymes
  4.    None of the above
 Discuss Question
Answer: Option B. -> hormones
Question 57. Our major foods, fibres, spices, fruits and beverage crops are
  1.    flowering plants
  2.    gymnosperms plants
  3.    pteridophytes
  4.    bryophytes
 Discuss Question
Answer: Option A. -> flowering plants
Question 58. Movements due to light are shown by
  1.    flowering plants
  2.    lower plants
  3.    all land plants
  4.    all the plants
 Discuss Question
Answer: Option A. -> flowering plants
Question 59. Outer covering of virus made up of protein is
  1.    capsid
  2.    coat
  3.    virion
  4.    viriod
 Discuss Question
Answer: Option A. -> capsid
Question 60. Radish is a
  1.    bulb
  2.    conn
  3.    modified root
  4.    tuber
 Discuss Question
Answer: Option C. -> modified root

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