Tag: evolution

Questions Related to evolution

Which of the following were abundant in mesozoic era?

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  1. Mammals

  2. Reptiles

  3. Insects

  4. Fishes

Show answer
Correct Option: B
Explanation:

Reptiles were the most dominant animals of Mesozoic era, which includes the flying reptiles, birds and angiosperms

So, the correct answer is 'Reptiles'

Assertion : Comparative biochemistry provides a strong evidence in favour of common ancestry of living beings. 

Reason : Genetic code is universal.

zoology evolution evidences for evolution - taxonomy, molecular biology and cytology evidences of evolution evidences of biological evolution

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true

Show answer
Correct Option: B
Explanation:

Convincing evidence of common ancestry comes from the similarities in the biochemical composition, reactions and physiological activities of living beings, like metabolic process, enzymes, cytochrome C, insulin, haemoglobin, blood and lymph etc. Genetic code is the sequence of DNA nucleotides that determines the amino acid sequence of the translated protein. The genetic code is read in triplets of basescalled codons.  Genetic code is applicable universally i.e. a codon specifies the same amino acid from a virus to a tree or human beings. The mRNA from chick oviduct introduced in E. coli produces an ovalbumen in the bacterium exactly similar to one formed in chick.

State whether the following statements are true or false:
Somatic variations form the basis of evolution.

zoology evolution evidences for evolution - taxonomy, molecular biology and cytology evidences of evolution evidences of biological evolution

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Somatic variations are not inherited. These are variations in somatic cells. While genetic variations are inherited and are due to variation of DNA from germ cells. These genetic variations form the basis of evolution.

Hence, the correct answer is 'False'.

From the given data characteristics identify the correct pre - historic man:

(i) They were about 1.8m tall with well built body.

(ii) Broad and arched forehead and also well developed chin.

(iii) They could walk and run faster.

(iv) They made excellent tools and cave paintings.

zoology evolution evidences for evolution - taxonomy, molecular biology and cytology evidences of evolution evidences of biological evolution

  1. Cro-Magnon man.

  2. Tuang baby and Lucy.

  3. Pithecanthropus erectus.

  4. Tool maker.

Show answer
Correct Option: A

Individuals with better traits for the new environment have more offspring. The given statement can be related to which of the following phenomena?

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  1. Noe-Lamarckism

  2. Gene drift

  3. Natural selection

  4. All of the above

Show answer
Correct Option: C
Explanation:

The theory of natural selection was given by Darwin. According to the law of natural selection, nature supports the survival of the fittest. It means that, the individual which is better adapted to the environment, will survive and produce new individual. So, the correct option is C.

The inherited character long neck in giraffe is an example of 

zoology evolution examples of natural selection selection natural selection

  1. Genetic variation

  2. Natural selection

  3. Gene drift

  4. All of the above

Show answer
Correct Option: B
Explanation:

Long necks and long legs and can reach food high in the trees does not mean that a need to reach high browse was a causative factor in the evolution of those characteristics. Clearly, both Darwin's and Lamarck's conceptions of giraffe evolution were highly speculative.

So, the correct answer is "Natural selection".

Which of the following process is responsible for inheritance during natural selection?

zoology evolution examples of natural selection selection natural selection

  1. Crossover

  2. Mutation

  3. Variation

  4. All of the above

Show answer
Correct Option: D
Explanation:

Natural selection:- The differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over.

principles of natural selection:-
  • 1) Variation. Organisms (within populations) exhibit individual         variation in appearance and behavior.
  • 2) Inheritance. Some traits are consistently passed on from parent to offspring.
  • 3) High rate of population growth.
  • 4) Differential survival and reproduction.    So, the correct answer is"All of the above".                                                                                  

Darwin's finches are an example of 

zoology evolution examples of natural selection selection natural selection

  1. Genetic variation

  2. Adaptive radiation

  3. Convergent evolution

  4. None of the above

Show answer
Correct Option: B
Explanation:

Darwin observed amazing diversity among the creatures which originated from a particular geographical area and radiated to the other habitat. The diversity in the type of beaks of finches adapted to different feeding habits on the Galapagos islands is considered as an example of adaptive radiation and serves as an evidence for an origin of species by natural selection.

Thus, the correct answer is option B.

Which of the following defines the relation between adaptive radiation and natural selection?

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  1. Natural selection is usually the principle mechanism driving adaptive radiation.

  2. Natural selection leads to adaptation during adaptive radiation.

  3. Natural selection causes mutational changes during adaptive radiation.

  4. All of the above.

Show answer
Correct Option: A
Explanation:
Natural selection and adaptive radiation are related to each other. A progressive change in which organisms diversify rapidly from an ancestral species into two or more groups to adapt to the changing environment is called an adaptive radiation. Natural selection is the adaptation of the individual towards the changing environment to survive. So, natural selection is the principal mechanism driving adaptive radiation. So, the correct option is A.