Why is variation alone not sufficient for evolution?
Answer and explanation
Correct answer: Because useful variations must also survive across generations
Evolution requires more than the appearance of differences. A variation must be heritable, and if it improves survival or reproduction in a particular environment, it may become more common over successive generations. Neutral or harmful variations may disappear, while a non-heritable variation cannot be reliably passed on. Option A captures this requirement. B and C are absolute and false, and D misunderstands evolution as an immediate event.
Frequently asked questions
What is the correct answer to this question?
Because useful variations must also survive across generations
Why is this the correct answer?
Evolution requires more than the appearance of differences. A variation must be heritable, and if it improves survival or reproduction in a particular environment, it may become more common over successive generations. Neutral or harmful variations may disappear, while a non-heritable variation cannot be reliably passed on. Option A captures this requirement. B and C are absolute and false, and D misunderstands evolution as an immediate event.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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