Tag: origin of life and organic evolution

Questions Related to origin of life and organic evolution

The theory of "continental drift" was originally proposed by ____________.

zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

  1. Alfred Bailey

  2. Charles Darwin

  3. Alfred Wegener

  4. Robert I. Bowman

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Correct Option: C

What is the source of genetic variation?

zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

  1. Gene flow

  2. Genetic drift

  3. Inbreeding

  4. Mutation

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Correct Option: D

Reproduction of the groups at different times of the year lead to

zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

  1. Geographical isolation

  2. Mechanical isolation

  3. Temporal isolation

  4. Hybrid sterility

  5. Behavioral isolation

Show answer
Correct Option: C
Explanation:

The presence of populations of a species in distant localities preventing the gene flow between them leads to geographical isolation. Incompatible differences in reproductive structures refer to as mechanical isolation. Different periods of attaiment of sexual maturity lead to temporal isolation. Hybrid sterility is a post zygotic isolation. Incompatible premating behaviour leading to no attraction between groups for mating is termed as behavioural isolation. Thus, the correct answer is C.

The hypothesis that all photosynthetic organisms require a source of hydrogen was first proposed by ______________.

zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

  1. Van Niel

  2. Hatch and Slack

  3. Robin Hill

  4. Ruber and Kamen

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Correct Option: A

Which of the following helps in species identification based on biological species concept?

zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

  1. Morphological distinctiveness

  2. Behavioral distinctiveness

  3. Physiological distinctiveness

  4. Geographical isolation

  5. Reproductive isolation

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Correct Option: E
Explanation:

Reproductive isolation is brought about by the change in genetic material, gene pool and structure of genital organs. It prevents interbreeding between populations whether they are geographically isolated or living close together.

As the biological species concept defines species in terms of inbreeding.
Hence option E is the correct answer.

T. R. Malthus is famous for his book on :

zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

  1. Population

  2. Mathematics

  3. Geography

  4. Genetics

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Correct Option: A
Explanation:

T.R. Malthus is famous for his book 'An Essay on the Principle of Population'.

So, the correct option is, 'Population'

Which is related to evolution?

zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

  1. Reproduction

  2. Competition

  3. Variations

  4. Extinction

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Correct Option: C

Unit of evolution / natural selection or survival of the fittest or modern synthetic theory is __________.

zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

  1. Species

  2. Population

  3. Family

  4. Individual

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Correct Option: B

Which scientist gave the theory of continuity of germplasm?

zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

  1. Weismann

  2. Mendel

  3. Lamarck

  4. Darwin

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Correct Option: A
Explanation:

Weismann gave theory of germplasm, according to which organisms are made up of two types of cells, the somatic cells and germ cells. Characters are transmitted through generations by germ cells and not somatic cells.

Saltation and Darwinian variations respectively are

zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

  1. Large and small

  2. Directional and directionless

  3. Small and random

  4. Major variation and minor variation

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Correct Option: D
Explanation:

Saltation is an abrupt variation in the appearance of an organism, species, etc, usually caused by a genetic mutation (single step large mutation).  

Darwinian variations are that the speciation occurs gradually through a number of generations, with an accumulation of minor variations.
Mutations are random and directionless, while variations are small and directional as per Darwin. 
So the answer is 'Major variation and minor variation'.