71. The earliest organisms were ______.
A. heterotrophic and anaerobic
B. autotrophic and anaerobic
C. heterotrophic and aerobic
D. autotrophic and aerobic
Answer : Option A
72. Which one of the following is present today but was absent about 3.5 billion years ago ?
73. Coacervates were experimentally produced by .............
A. Sydney Fox and Oparin
B. Fischer and Huxley
C. Jacob and Monod
D. Urey and Miller
Answer : Option D
74. Urey and Miller in their experiment used a mixture of gases corresponding to primitive earth. These were ______.
A. \(C_{3}\),\(NH_{3}\),\(CH_{2}\),\(CO_{2}\)
B. \(O_{2}\),\(NH_{3}\),\(CH_{4}\),\(H_{2}\)
C. \(NH_{3}\),\(CH_{4}\),\(H_{2}O\),\(CO_{2}\)
D. \(CH_{4}\),\(NH_{3}\),\(H_{2}\),\(H_{2}O\)
Answer : Option D
75. According to abiogenesis life originate from ______.
A. non-living matter
B. pre-exiting life
C. chemicals
D. extra-terrestrial matter
Answer : Option A
76. Mega – evolution is ______.
A. Changes in the gene pool
B. evolution due to mutations
C. origin of a new biological group
D. the evolution that takes centuries
Answer : Option C
77. Evolutionary convergence is characterised by
A. development of dissimilar characteristics in closely related groups
B. development of a common set of characteristics in the groups of different ancestry
C. development of characteristics by random mating
D. replacement of common characteristics in different groups.
Answer : Option D
78. Parallelism is ______.
A. adaptive divergence
B. adaptive divergence
C. adaptive convergence of far off species
D. adaptive convergence of closely related groups.
Answer : Option D
79. Mesozoic era is associated with mass extinction of ______.
80. Serial homology is exhibited by ______.
A. Organs of same individual occupying different levels of the body
B. Organs of different organisms with same function
C. appendages of various parts of prawn body
D. both (A) and (C)
Answer : Option D