61. Most highly intelligent mammals are
A. whales
B. dolphins
C. elephants
D. kangaroos
✅ The correct answer is option B.
Biology MCQs
62. 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
✅ The correct answer is option D.
63. Night blindness is cause by lack of which vitamin?
A. Vitamin A
B. Vitamin B
C. Vitamin C
D. Vitamin D
✅ The correct answer is option A.
64. Normal adult human male has
A. 10 gram of haemoglobin/100 gram of blood
B. 14 gram of haemoglobin/100 gram of blood
C. 18 gram of haemoglobin/100 gram of blood
D. 24 gram of haemoglobin/100 gram of blood
✅ The correct answer is option B.
65. Nucleus, the genetic material containing rounded body in each cell, was first discovered in 1831 by
A. Robert Hooke
B. Robert Brown
C. Rudolf Virchow
D. Theodore Schwann
✅ The correct answer is option B.
66. N2 content is kept constant in the biosphere due to
A. N2 fixation
B. industrial pollution
C. nitrogen cycle
D. absorption of N2
✅ The correct answer is option C.
67. O2 released in the process of photosynthesis comes from
A. CO2
B. water
C. sugar
D. pyruvic acid
✅ The correct answer is option B.
68. Primary phloem develops from
A. lateral meristem
B. protoderm
C. extrastelar cambium
D. provascular tissue
✅ The correct answer is option D.
69. Most common disease of poultry in India is
A. fowl pox
B. tick fever
C. ranikhet
D. coryza
✅ The correct answer is option C.
70. Most fish do not sink in water because of the presence of
A. I and II are correct
B. II and III are correct
C. III and IV are correct
D. I, II, III and IV are correct
✅ The correct answer is option A.