Question

sponge knowledge check
__________ are specialized cells that line pores in a sponge and have a flagellum that spins to pull in water and food.
○ holocytes
○ amoebocytes
○ porocytes
○ choanocytes

Explanation:

• Holocytes: Not a recognized cell type in sponges.
• Amoebocytes: These cells in sponges have various functions like transporting nutrients and waste, but not specifically lining pores with flagella for water - food intake.
• Porocytes: These are cells that form the pores (ostia) in sponges, but they do not have flagella for pulling in water and food.
• Choanocytes: Also known as collar cells. They line the inner chambers of sponges (pore - like structures in a sense as they are part of the water - flow system). The flagellum of choanocytes spins to create a water current that pulls in water (and with it, food particles).

Answer:

choanocytes