Question

Choose the correct option.

According to Darwin, organic evolution is due to?

• A. Reduced feeding efficiency in one species due to the presence of interfering species.
• B. Competition within closely related species.
• C. Interspecific competition
• D. Intraspecific competition.

Answer 1

The correct option is C

Interspecific competition

The correct Option is C.

Explanation for correct option:

1. Organic Growth: Genetic change in the population of organisms because of environmental change.
2. These modifications in consecutive generations cause distinguishable distinctions between ancestors and descendants.
3. According to Darwin, the organic evolution is due to interspecific competition between species.
4. Interspecific competition is a form of competition in which individuals of different species compete for the same resource (food and shelter) in an ecosystem.
5. For example, in the ocean, fish is the command prey of dolphins, sharks, and other sea animals.

Explanation for incorrect option:

Option A:

1. Reduced feeding efficiency in one species due to the presence of interfering species is termed interference competition.
2. For example, Because goats were introduced to the Galapagos Islands, the Abingdon tortoise became extinct within a decade.

Option B:

1. Competition within closely related species occurs when it does not cause any evolution.
2. For example, Cow and goat are closely related species and compete for the same resources but do not cause any evolution.

Option D:

1. Intraspecific competition: It occurs when organisms from the same species are competing for the same resources so that they can get the optimum amount of resources.
2. For example, two plants of the same species, when grown very close, start competing for limited resources available like sunlight, soil nutrient, water, etc.
3. This competition affects their growth.

Final Answer: According to Darwin, interspecific competition was the reason for organic evolution.