Concept:Extracellular digestion is the breakdown of food outside the cell by secreted enzymes.
Explanation:In extracellular digestion, an organism releases enzymes onto food material in its environment.
The enzymes break down large food molecules into smaller soluble forms.
The digested nutrients are then absorbed through the cell membrane.
Rhizopus is a saprophytic fungus that lives on dead organic matter.
It secretes enzymes into the substrate and absorbs the digested products.
Spirogyra, Paramecium, and Amoeba carry out intracellular digestion inside their cells.
Therefore, Rhizopus is the organism that exhibits extracellular digestion.
Answer:D. Rhizopus