Class 12 Biology · Chapter 12 · Test 2
Evidences of Evolution
40 MCQs
40 questions · 35 min · 40 marks
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Sample questions
The first 5 of 40. Try each one, then tap to see the answer.
Question 1
Which statement is correct?
- AHomologous organs are functionally different but structurally alike
- BAnalogous organs are functionally different but structurally alike
- CArms of a man, forelimb of a cat and flipper of a whale are analogous
- DWings of bats, birds and insects are homologous
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Answer: A
Homologous organs have similar structure but different functions while analogous organs have similar function but different structure.
Question 2
Which of the following is an example of homologous organs?
- AWings of bird and insect
- BForelimbs of human and whale
- CFin of fish and wing of bird
- DEye of octopus and human
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Answer: B
Vertebrate forelimbs share a common bone arrangement but have different functions.
Question 3
Which of the following ideas is common to both Lamarckism and Darwinism?
- AMutations are the source of genetic variations
- BAdaptations enable individuals to cope with environmental challenges
- CUse and disuse of organs results in the development of acquired characters
- DAcquired characters are inherited to next generations
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Answer: B
Both theories explain adaptation to environment though their mechanisms differ.
Question 4
What may be the best evidence for the endosymbiotic evolution of eukaryotes?
- APresence of a nucleus in eukaryotes
- BCircular DNA and 70S ribosomes in mitochondria
- CSingle-layered membranes around mitochondria
- DLarge volume of eukaryotic cells
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Answer: B
Prokaryote-like DNA and ribosomes in mitochondria suggest they were once free-living prokaryotes.
Question 5
Biogeography is the study of:
- AGeographic distribution of plants and animals
- BStructure of fossils only
- CGenes of organisms
- DCell organelles
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Answer: A
It shows that life forms in different parts of the world have distinct evolutionary histories.
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