Concept:Mucor is a saprophytic fungus that obtains nutrients from dead organic matter.
Explanation:Mucor grows on a piece of bread because the bread is dead and decaying organic material.
Saprophytism is the mode of feeding in which an organism secretes enzymes onto dead organic matter and absorbs the dissolved nutrients.
Scavenging refers to animals feeding on dead bodies, not fungi.
Commensalism is a relationship where one organism benefits while the other is unaffected.
Autotrophism involves making food from simple inorganic substances, which Mucor cannot do.
Therefore, the growth of Mucor on bread is a clear example of saprophytism.
Answer:D. saprophytism