What is the small cavity in the cytoplasm of protists that temporarily stores food?

What is the small cavity in the cytoplasm of protists that temporarily stores food?

• A. Contractile vacuole
• B. Mitochondrion
• C. Nucleus
• D. Ribosome

Answer: (A)

The concept here is that protists use membrane-bound sacs, called vacuoles, in the cytoplasm to manage and store substances temporarily. Among the structures listed, the contractile vacuole is a membrane-bound cavity inside the cytoplasm that can hold material briefly as part of its function of regulating the cell’s fluid balance. While its main job is to collect excess water and expel it, it can also serve as a temporary storage space for material being processed, which is why it’s the best match among the options for a small cytoplasmic cavity that stores something temporarily. The other structures have different primary roles: mitochondria generate energy, the nucleus houses genetic material, and ribosomes synthesize proteins, none of which are cavities for storing material. If a true “food storage” vacuole were listed, that would be the direct answer for storing ingested food, but among these choices the contractile vacuole is the closest fit.

The concept here is that protists use membrane-bound sacs, called vacuoles, in the cytoplasm to manage and store substances temporarily. Among the structures listed, the contractile vacuole is a membrane-bound cavity inside the cytoplasm that can hold material briefly as part of its function of regulating the cell’s fluid balance. While its main job is to collect excess water and expel it, it can also serve as a temporary storage space for material being processed, which is why it’s the best match among the options for a small cytoplasmic cavity that stores something temporarily. The other structures have different primary roles: mitochondria generate energy, the nucleus houses genetic material, and ribosomes synthesize proteins, none of which are cavities for storing material. If a true “food storage” vacuole were listed, that would be the direct answer for storing ingested food, but among these choices the contractile vacuole is the closest fit.