Consider the following statements about biological communities (I) Their members share a common gene pool (II) The community remains stable even through some physical aspect of environment may undergo change (III) They possess predictable kinds of species in predictable proportions (IV) Interactions between their frequent within the community than between their members and those of neighboring communities Which two of all the above statements apply to all stable biological communities?
Correct answer: D. III and IV
- A. I and II
- B. II and III
- C. I and III
- D. III and IV
- E. II and IV
Explanation
Statements 1 and 2 are incorrect because the members of biological communities do not share a common gene pool; if the environment undergoes certain changes it will affect the community as well and hence the community will not remain stable.
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Evolution describes heritable change in populations over generations through variation, natural selection and adaptation. Lamarckism explains inheritance of acquired characteristics, while Darwinism explains selection of favourable inherited variations; these historical explanations must not be confused with the modern genetic account of evolutionary change.
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