Why is a long period of time necessary in natural selection and speciation?
Answer and explanation
Correct answer: Small inherited changes need time to accumulate in populations.
Natural selection usually acts on small heritable variations that affect survival or reproduction by different amounts. One generation normally produces only limited change, and a population must pass through many generations for advantageous differences to become common. If populations remain separated and continue to accumulate differences, reproductive isolation may eventually develop, leading to speciation. Thus option A is correct; the other choices wrongly describe evolution as instant or unrelated to time.
Frequently asked questions
What is the correct answer to this question?
Small inherited changes need time to accumulate in populations.
Why is this the correct answer?
Natural selection usually acts on small heritable variations that affect survival or reproduction by different amounts. One generation normally produces only limited change, and a population must pass through many generations for advantageous differences to become common. If populations remain separated and continue to accumulate differences, reproductive isolation may eventually develop, leading to speciation. Thus option A is correct; the other choices wrongly describe evolution as instant or unrelated to time.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Heredity and Evolution. Topic: Evolution and speciation.
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