Phylum Porifera
In sponges, exchange of water and diffusion is carried out by process of:
osmosis
active transport
diffusion
passive transport
diffusion
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Needle-like spikes present on skeleton of sponges are called:A. needles
B. stinging cells
C. defensive cells
D. spicules
Skeleton of sponges are made up of a fibrous protein called:
A. spongin
B. fibrin
C. fibrinogen
D. fibrous protein
A thin flat cell that covers outer surface of sponges are called:
A. porocytes
B. chondrocytes
C. pinacocytes
D. leukocytes
Collar cells of sponges are known as:
A. choanocytes
B. chondrocytes
C. pinacocytes
D. porocytes
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