Tag: mechanism of evolution

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Questions Related to mechanism of evolution

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

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

  1. Geographical isolation

  2. Mechanical isolation

  3. Temporal isolation

  4. Hybrid sterility

  5. Behavioral isolation
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. Van Niel

  2. Hatch and Slack

  3. Robin Hill

  4. Ruber and Kamen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

C.B. van Niel proposed that photosynthesis is a light-dependent redox reaction in which hydrogen from a donor (like H2O or H2S) reduces CO2 to carbohydrates.

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

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

  1. Morphological distinctiveness

  2. Behavioral distinctiveness

  3. Physiological distinctiveness

  4. Geographical isolation

  5. Reproductive isolation
Reveal answer Fill a bubble to check yourself
E Correct answer
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.

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

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

  1. Species

  2. Population

  3. Family

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

Evolutionary changes occur at the level of populations rather than individuals. A population is the smallest unit that can undergo evolutionary change over generations through shifts in allele frequencies.

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

Which scientist gave the theory of continuity of germplasm?

  1. Weismann

  2. Mendel

  3. Lamarck

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

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

Saltation and Darwinian variations respectively are

  1. Large and small

  2. Directional and directionless

  3. Small and random

  4. Major variation and minor variation
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.