Which statement correctly distinguishes chewing food with teeth from digesting food by enzymes?
Answer and explanation
Correct answer: Chewing with teeth is mainly a physical change, whereas enzyme-mediated digestion is a chemical change.
When food is chewed only by teeth, it is broken into smaller pieces without changing its chemical composition; therefore, this is mainly a physical change. During enzyme-mediated digestion, complex food molecules such as starch and proteins are chemically converted into simpler substances. Thus, digestion is a chemical change. Option B is incorrect because digestion does not merely reduce particle size; it also forms new, simpler substances.
Frequently asked questions
What is the correct answer to this question?
Chewing with teeth is mainly a physical change, whereas enzyme-mediated digestion is a chemical change.
Why is this the correct answer?
When food is chewed only by teeth, it is broken into smaller pieces without changing its chemical composition; therefore, this is mainly a physical change. During enzyme-mediated digestion, complex food molecules such as starch and proteins are chemically converted into simpler substances. Thus, digestion is a chemical change. Option B is incorrect because digestion does not merely reduce particle size; it also forms new, simpler substances.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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