Why do heterotrophic organisms need to digest food?
Answer and explanation
Correct answer: Because large food molecules must be changed into small soluble molecules
The governing concept is digestion followed by absorption. Heterotrophic organisms obtain ready-made food, but nutrients such as starches, proteins, and fats are often large, complex molecules that cannot cross the intestinal lining efficiently. Enzymes break them into smaller soluble substances—sugars, amino acids, and fatty acids with glycerol—which can be absorbed and used for energy, growth, and repair. Therefore option A is correct; the other choices confuse digestion with plant transport or gas exchange.
Frequently asked questions
What is the correct answer to this question?
Because large food molecules must be changed into small soluble molecules
Why is this the correct answer?
The governing concept is digestion followed by absorption. Heterotrophic organisms obtain ready-made food, but nutrients such as starches, proteins, and fats are often large, complex molecules that cannot cross the intestinal lining efficiently. Enzymes break them into smaller soluble substances—sugars, amino acids, and fatty acids with glycerol—which can be absorbed and used for energy, growth, and repair. Therefore option A is correct; the other choices confuse digestion with plant transport or gas exchange.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
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