CBSE Class 12 Biology Evolution Minds Map

Important Questions for NCERT Class 12 Biology Evolution

Ques. Convergent evolution is illustrated by
(a) rat and dog
(b) bacterium and protozoan
(c) starfish and cuttle fish
(d) dogfish and whale. 

Answer: D

Ques. Industrial melanism is an example of
(a) drug resistance
(b) darkening of skin due to smoke from industries
(c) protective resemblance with the surroundings
(d) defensive adaptation of skin against ultraviolet radiations. 

Answer: C

Ques. Which one of the following describes correctly the homologous structures ?
(a) Organs with anatomical similarities, but performing different functions
(b) Organs with anatomical dissimilarities, but performing same function
(c) Organs that have no function now, but had an important function in ancestor
(d) Organs appearing only in embryonic stage and disappearing later in the adult 

Answer: A

Ques. Which of the following are homologous organs?
(a) Wings of birds and locust
(b) Wings of birds and pectoral fins of fish
(c) Wings of bat and butterfly
(d) Legs of frog and cockroach 

Answer: B

Ques. Sequence of which of the following is used to know the phylogeny?
(a) mRNA (b) rRNA
(c) tRNA (d) DNA 

Answer: B

Ques. Half life period of 14C is
(a) 500 years (b) 5000 years
(c) 50 years (d) 5 × 104 years. 

Answer: B

Ques. In Lederberg’s replica plating experiment what shall be used to obtain streptomycin resistant strain?
(a) Minimal medium and streptomycin
(b) Complete medium and streptomycin
(c) Only minimal medium
(d) Only complete medium 

Answer: A

Ques. Similarities in organism with different genotype indicates
(a) microevolution
(b) macroevolution
(c) convergent evolution
(d) divergent evolution. 

Answer: C

Ques. Which is not a vestigial organ in man?
(a) Third molar (b) Nails
(c) Segmental muscles of abdomen
(d) Coccyx 

Answer: B

Ques. Phenomenon of ‘Industrial melanism’ demonstrates
(a) geographical isolation
(b) reproductive isolation
(c) natural selection
(d) induced mutation. 

Answer: C

Ques. Which of the following are homologous organs?
(a) Wings of bird and hands of human
(b) Nails of human being and claws in animals
(c) Wings of bird and wings of insect
(d) Wings of bat and wings of cockroach

Answer: A

Ques. Evolutionary convergence is characterised by
(a) development of dissimilar characteristics in closely related groups
(b) development of a common set of characteristics in groups of different ancestry
(c) development of characteristics by random mating
(d) replacement of common characteristics in different groups.

Answer: B

Ques. Which of the following is the correct group of vestigial organs in man?
(a) Nictitating membrane, ear muscles, eyelids and coccyx
(b) Appendix, coccyx, ear muscles and elbow joint
(c) Wisdom tooth, coccyx, body hair and ear muscles
(d) Wisdom tooth, body hairs, nictitating membrane and vermiform appendix 

Answer: D

Ques. Which of the following isotopes is most dangerous to Homo sapiens?
(a) Phosphorus-32 (b) Strontium-90
(c) Caesium-137 (d) Iodine-131 

Answer: B

Ques. The change of the lighter-coloured variety of peppered moth (Biston betularia) to its darker variety (Biston carbonaria) is due to
(a) mutation (b) regeneration
(c) genetic isolation (d) temporal isolation.

Answer: A

Ques. The homologous organs are those that show similarity in
(a) appearance (b) function
(c) origin (d) size. 

Answer: C

Ques. The presence of gill slits, in the embryos of all vertebrates, supports the theory of
(a) metamorphosis (b) biogenesis
(c) organic evolution (d) recapitulation. 

Answer: D

Ques. The earliest fossil form, in the phylogeny of horse, is
(a) Equus (b) Mesohippus
(c) Eohippus (d) Merychippus. 

Answer: C

Ques. Which of the following is a pair of homologous organs?
(a) Pectoral fin of rohu and forelimb of horse
(b) Wings of grasshopper and wings of crow
(c) Lungs of rabbit and gills of rohu
(d) Wings of bat and wings of butterfly 

Answer: A

Ques. Evolutionary convergence is development of
(a) common set of characters in group of different ancestry
(b) dissimilar characters in closely related groups
(c) common set of characters in closely related groups
(d) random mating. 

Answer: A