Biology · Science General

Evolution and Biological Adaptation

1,288 Questions

Evolution and biological adaptation focus on natural selection, speciation events, and how organisms adjust to environmental changes over time. These foundational biology concepts appear frequently in general science sections of civil services and school board examinations. Use these questions to study evolutionary theories, ancestral traits, and the fossil record.

Natural selection mechanismsSpeciation event examplesBiological adaptation traitsPanspermia hypothesis conceptsFossil record analysisMate selection theories

Evolution and Biological Adaptation Questions

Multiple choice

Abiogenesis is the

  1. origin of life from non-living organism

  2. origin of life from living organism

  3. origin of viruses and microbes

  4. spontaneous generation

  5. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Abiogenesis is the process by which life arises naturally from non-living matter. Spontaneous generation is the supposed production of living organisms from non-living matter, as inferred from the apparent appearance of life in some supposedly sterile environments. 

Multiple choice

The theory of Neo Lamarckism is based on

  1. mutation and natural selection

  2. mutation, variation and environmental conditions

  3. enormous fertility

  4. variation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Neo-Lamarckism extends Lamarck's theory with modern genetics. It emphasizes that mutations, variations, and environmental factors together drive evolution. Unlike Darwinism (natural selection + variation), Neo-Lamarckism gives environmental influences a more direct role. 'Enormous fertility' and 'variation' alone are incomplete.

Multiple choice

The theory proposed by Darwin was based on

  1. variation

  2. natural selection

  3. mutation

  4. inheritance of acquired characters
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Darwin's theory centers on natural selection - organisms with favorable variations are more likely to survive and reproduce, passing those traits to offspring. While variation provides the raw material, natural selection is the driving force. Mutation is the source of variation, and inheritance of acquired characters is Lamarck's incorrect theory.

Multiple choice

Pick the one which is not a part of Darwinian's natural selection theory.

  1. Overproduction

  2. Struggle for existence

  3. Use and disuse of organs

  4. Survival of the fittest
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Darwin's theory of natural selection includes overproduction, struggle for existence, and survival of the fittest. 'Use and disuse of organs' was Lamarck's theory of evolution, not part of Darwinian natural selection. Lamarck proposed that organisms could pass on acquired traits through use/disuse, which Darwin rejected.

Multiple choice

Organs of different organisms having similar function but different in origin are

  1. homologous organs

  2. analogous organs

  3. vestigial organs

  4. all of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Analogous organs are structures in different organisms that perform similar functions but have different evolutionary origins and anatomical structures. Examples include wings of bats (skin membrane) versus birds (feathers), or eyes of octopuses versus mammals. These arise through convergent evolution - similar environmental pressures lead to similar functional solutions.

Multiple choice

'Ontogeny recapitulates phylogeny' is called Biogenetic law, which is given by

  1. E Haeckel

  2. C Darwin

  3. J Lamarck

  4. Mendel
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ernst Haeckel proposed the Biogenetic Law, stating 'ontogeny recapitulates phylogeny' - that embryonic development replays evolutionary history. While influential, this theory is now considered an oversimplification. Darwin proposed natural selection, Lamarck proposed inheritance of acquired characteristics, and Mendel discovered genetic inheritance rules.

Multiple choice

The most accepted theory of evolution is

  1. theory of natural selection

  2. theory of origin of species

  3. theory of inheritance of acquired characters

  4. synthetic theory of evolution
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The synthetic theory of evolution (modern synthesis) combines Darwin's natural selection with Mendelian genetics and population genetics, making it the most comprehensive and accepted theory today. It explains evolution at genetic level. The other options are either incomplete or largely discredited theories.

Multiple choice

Forelimb of horse, human, whale and bat are

  1. connecting links

  2. analogous organs

  3. homologous organs

  4. vestigial organs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Homologous organs have similar anatomical structure but different functions, indicating common ancestry. Horse forelimbs (running), human hands (manipulation), whale flippers (swimming), and bat wings (flying) all share the same basic bone structure. Analogous organs have different origins but similar functions, while vestigial organs are reduced and non-functional.

Multiple choice

�The characters acquired by an organism during its life time is transmitted to the next generation. This statement is the basis of

  1. Darwinism

  2. Neo-Darwinism

  3. Synthetic theory

  4. Lamarckism
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lamarckism is based on the inheritance of acquired characteristics - the idea that traits developed during an organism's lifetime can be passed to offspring. This contrasts with Darwinism (natural selection), Neo-Darwinism (modern synthesis), and Synthetic theory, which do not support Lamarck's mechanism.

Multiple choice

Animals which remain fixed at one place have

  1. radial symmetry

  2. bilateral symmetry

  3. Both (A) and (B)

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Radial symmetry is characteristic of many sedentary (fixed) animals, e.g., coelenterate and Echinodermata.

Multiple choice

Which of the following statements is/are correct?

a. Advanced organisms have acquired their particular body designs relatively recently. b. Primitive organisms have comparatively simpler body design. c. Advanced organisms are the same as complex organisms.

  1. Only a

  2. Only b

  3. Only c

  4. Only a and c

  5. All of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Advanced organisms have acquired their particular body designs relatively recently. Primitive organisms have comparatively simpler body design. Advanced organisms are the same as complex organisms. This is the correct answer, as all statements are correct.

Multiple choice

Which of the following statements is/are correct?

a. Some groups of organisms, which have ancient body designs have not changed very much. b. Complexity in design of an organism increases over evolutionary time. c. Most life forms that we see today have arisen by an accumulation of changes in body design that allow the organism possessing them to survive better.

  1. Only a

  2. Only b

  3. Only c

  4. Only a and c

  5. All of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer, as all statements are correct.