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Evolution

More Topic from Biology

Question 1
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A population will not exist in Handy - Weinberg equilibrium if

  • individuals mate selectively

  • there are no mutations

  • there is no migration

  • the population is large

Solution

A.

individuals mate selectively

Hardy-Weinberg equilibrium exists in population only when following conditions are present.
No mutation
No gene flow
No genetic drift
No genetic recombination
No natural selection pressure.
If the individuals in the population mate selectively, it will had to mutation thus shifting the Hardy-Weinberg equilibrium.

Question 2
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About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and

  • phosphorus and sulphur

  • sulphur and magnesium

  • magnesium and sodium

  • calcium and phosphorus

Solution

A.

phosphorus and sulphur

About 98% of the mass of every living organisms including bacterium and human beings is composed of just six elements i.e., Carbon (C), Hydrogen (H), Nitrogen (N), Oxygen (O), Phosphorus (P) and Sulphur (S).

Question 3
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According to Darwin, the organic evolution is due to

  • intraspecific competition

  • interspecific competition

  • competition within closely related species

  • reduced feeding efficiency in one species due to the presence of interfering species

Solution

B.

interspecific competition

Darwin stated that the organic evolution is due to interspecific competition. it is the competition between members of different species. Intraspecific competition occurs amongst members of the same species for obtaining optimum amounts of their food, shelter, mate, water, light, species etc. Closely species compete cannot cause evolution. Reduced feeding efficiency in one species due to the presence of interfering species is due to strugle for existance.

Question 4
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Adaptive radiation refers to

  • adaptations due to geographical isolation

  • evolution of different species from a common ancestor

  • migration of members of a species to different geographical areas

  • power of adaptation in an individual to a variety of environments

Solution

B.

evolution of different species from a common ancestor

Adaptive radiation is the development of different functional structures from a common ancestral form.

Question 5
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Among the human ancestors the brain size was more that 1000 CC in

  • Homo neander-thalensis

  • Homo erectus

  • Ramapithecus

  • Homo habilis

Solution

A.

Homo neander-thalensis

The cranial capacity of Homo neanderthalensis was about 1450 CC, roughly equal to that of Modern Man. 

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