Question

Darwin's 'Theory of Natural Selection' is mainly based on the following points - (A) All organisms show a tendency to increase numbers by producing a greater number of off-spring that can survive and reproduce.
(B) The generations continue to modify for adaptation, thereby gradually bringing changes in the species in the future.
(C) The individuals exhibit similarities in their physiological, structural and behavioral traits to bring identical structures.
(D) The number of individuals in a given species remains more or less constant.
Choose the correct answer from the options given below:

• A. (A), (B) and (D) only
• B. (A), (B) and (C) only
• C. (A), (B), (C) and (D)
• D. (B), (C) and (D) only

Hint:

In Darwin's theory, natural selection is driven by overproduction, competition, and the survival of the fittest, which leads to gradual changes in a species.

Answer 1

The Correct Option is A

Step 1: Understanding Natural Selection.
Darwin’s theory posits that:
- Organisms produce surplus offspring, leading to resource competition. - Advantageous traits enable survival and reproduction, with these traits inherited by offspring.
Step 2: Analyzing Options.
- (A) is valid: Organisms produce excess offspring, a foundation of natural selection.
- (B) is valid: Species gradually adapt environmentally via natural selection.
- (C) is invalid: Natural selection promotes trait variation, not uniformity.
- (D) is valid: Natural selection typically stabilizes population numbers.
Step 3: Conclusion.
Correct options are (A), (B), and (D) only.
Final Answer: \[\boxed{\text{The correct answer is (1) (A), (B) and (D) only.}}\]