When plants and animals die, their bodies are decomposed by organisms such as bacteria or fungi. Which statement is true regarding the decomposition process?

Question

A.
Decomposition is a chemical change because the identity of the dead plant or animal does not change.
B.
Decomposition is a chemical change because the organism is broken down into new substances.
C.
Decomposition is a physical change because the organism is broken down into new substances.
D.
Decomposition is a physical change because the identity of the dead plant or animal does not change.

Answer 1

The correct statement regarding the decomposition process is:

B. Decomposition is a chemical change because the organism is broken down into new substances.

During decomposition, the complex organic materials in dead plants and animals are broken down by decomposers (such as bacteria and fungi) into simpler substances, resulting in a change in the chemical composition of the material.