Concept:A saprophyte is an organism that obtains its nutrition from dead and decaying organic matter.
Explanation:Saprophytes play a key role in decomposition.
They break down complex organic molecules into simpler ones.
Most saprophytes are fungi or bacteria.
Among the given options:
•
Rhizopus is a fungus that lives on dead organic material and is a classic saprophyte.
•
Cuscuta is a parasitic plant – it attaches to a host and draws nutrients from it.
•
Spirogyra is a green alga that performs photosynthesis; it is autotrophic.
•
Grass is a green plant that makes its own food via photosynthesis; it is also autotrophic.
Therefore, only Rhizopus matches the definition of a saprophyte.
Answer:B. Rhizopus