Tag: zoology

Questions Related to zoology

Which of the following variations are temporary and have nothing to do with the last or next generation?

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

  1. Hereditary variations

  2. Discontinuous variations

  3. Environmental variations

  4. None of the above

Show answer
Correct Option: C
Explanation:

Environmental variations are those variations which are merely due to environment. These variations are temporary and have nothing to do with the next generation. Hereditary variations are those variations which transfer to next generation. Discontinuous variations are sudden changes in organism which are also heritable.

So, the correct answer is 'environmental variations'

The Book "Process of Organic Evolution" was published by

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

  1. Lamark

  2. Darwin

  3. G.L. Stebbins

  4. Dobzhansky

Show answer
Correct Option: C
Explanation:

  • The author of the book Process of organic evolution was G.L. Stebbins. This book includes an explanation of the synthetic theory of evolution.
  • The various concepts which are involved in the process of mutation and results in evolution.
  • The phenomena like recombination, variation, isolation, etc. are considered and explained with respect to evolution. 
Thus, the correct answer is option C.

Evolution will not occur if :

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

  1. There is no environmental influence.

  2. Genes are without effect.

  3. Somatic variations are not heritable.

  4. There is no genetic variations in individuals of a populations.

Show answer
Correct Option: D
Explanation:

Evolution is the change in the heritable characteristics of biological populations over successive generations. These characteristics are the expressions of genes that are passed on from parents to offspring during reproduction.

So, the correct answer is 'There are no genetic variations in individuals of a population'

Which is related to reproductive isolation?

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

  1. Genetic isolation

  2. Behavioural isolation

  3. Temporal isolation

  4. All the above

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Correct Option: D
Explanation:

A subpopulation becomes reproductively isolated from its parental population. It is the formation of species without geographical isolation and these species are called sympatric speciation. It is reproductive, behavioural and temporal isolation.

So, the correct option is 'All of the above'.

Modern theory of organic evolution stresses on :

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

  1. Mutations

  2. Isolations

  3. Population

  4. All the above

Show answer
Correct Option: D
Explanation:

The modern approach for understanding the organic evolution lays stress on subjects such as chromosomal aberrations, mutations, isolation, population. Hence, Option D is correct. 

Species are differentiated on the basis of ______________.

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

  1. Interbreeding

  2. Reproductive isolation

  3. Species diversity

  4. None of these

Show answer
Correct Option: B

Isolation leads to ________.

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

  1. Species differentiation

  2. Evolutionary divergence

  3. Formation of analogous structures.

  4. Formation of similar traits

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Correct Option: A

"Human population grows in geometric ratio while food materials increase in arithmetic proportion." It is a statement from :

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

  1. Darwin

  2. Bateson

  3. Amritya Sen

  4. Malthus

  5. Swaminathan

Show answer
Correct Option: D
Explanation:

Malthus gave the theory of principal of population which proposes that the human population grows in geometric ratio while food materials increase in arithmetic proportion.

So, the correct option is 'Malthus'.

Modern theory of evolution is based on :

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

  1. Mutations

  2. Genetic recombination

  3. Natural selection

  4. All the above

Show answer
Correct Option: D
Explanation:

Synthetic theory is considered as Modern theory and the main contributor of this theory was G.L.Stebbins. They considered 5 factors, responsible for organic evolution. They are as follows

1.Mutation 
2.Genetic recombinantion
3.Chromosomal aberration
4.Reproductive isolation
5.Natural Selection
So, the correct answer is 'All the above'

Which one does not help in understanding evolution?

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

  1. Genetic variation

  2. Natural selection

  3. Embryogenesis

  4. Isolation

Show answer
Correct Option: D
Explanation:

For understanding Evolution, we consider-

Genetic variation- These are changes in genes that are heritable, which might become useful for some, who get better adapted with habitat. 
Natural Selection- It is the process in which the individuals who are better suited for the environment leave behind more offsprings than the ones who are less suited. It is a key component in studying evolution.
Embryogenesis- It is the process and formation of an embryo. With the help of this, we're able to make links with different species on the basis of their embryos. 
Isolation is an important component in the process of Speciation. It doesn't help in understanding evolution. Hence, Option D is correct.