Which of the following options best describes adaptation for survival in organisms?

Step 1: Analyze the question The question asks which option best defines adaptation for survival. In Biology, adaptation is about how organisms become suited to their environment so they can survive and reproduce.

Step 2: The concept An adaptation is a heritable structural, physiological, or behavioural feature that improves an organism's fitness (its chance of surviving and reproducing) in a particular environment. Adaptations arise through natural selection over many generations. Individuals with helpful inherited traits survive and pass those traits on.

Examples:

• The camel's hump and its ability to conserve water (desert survival)
• The webbed feet of ducks (swimming)
• The long roots of desert plants (reaching deep water)

Step 3: Evaluate each option

• A. Correct. It says adaptation is inherited and increases survival and reproduction. This matches the biological definition.
• B. Wrong. Characteristics acquired during a lifetime (such as muscles from exercise) are not inherited. This is the old Lamarckian idea, which has been discredited.
• C. Wrong. Organisms do not generally change their environment to suit themselves. Adaptation is the organism fitting its environment, not the reverse.
• D. Partly tempting but wrong. Organisms do not develop new traits in response to environmental change. Variation already exists in a population, and the environment selects the traits that help. The traits do not appear because of the need.

Step 4: Answer

Exam tip: When you see "adaptation," look for the keywords inherited/heritable and survival and reproduction. Be cautious about options that say "acquired during lifetime" or "in response to need," because these reflect Lamarck's discredited ideas rather than Darwin's natural selection.