"Those who are better fit in an environment, leave more progeny than others." The evolutionary mechanism that operates for such a change is 

1. Natural selection

2. Genetic drift

3. Reproductive isolation

4. Polyploidy

In the case of peppered moth (Biston betularia), the black-coloured form became dominant over the light-coloured form in England during the industrial revolution. This is an example of:

A type of natural selection in which more individuals acquire peripheral character value at both ends of distribution curve is

1. Directional selection

2. Disruptive selection

3. Balancing selection

4. Stabilising selection

If more individuals acquire peripheral character value at both the ends of the distribution curve; in such case natural selection has resulted in

Which one of the following populations would most quickly lead to two groups with few shared traits?
1. a population with disruptive selection
2. a population with directional selection
3. a population with stabilizing selection
4. a population with no selection

A location with luxuriant growth of lichens on the trees indicates that the:-

1. trees are very healthy

2. trees are heavily infested

3. location is highly polluted

4. location is not polluted

Natural selection is best defined as occurring when the environment causes :
1. differential success in reproduction

2. differential mortality

3. assortative mating

4. a reduced gene pool

Directional selection favours:

(1) Both extremes of a trait

(2) Intermediate form of a trait

(3) Environmental differences

(4) One extreme form over the other extreme form and over intermediate forms of the trait

Industrial melanism is an example of:
 

 ............... operates to eliminate intermediate phenotypes.