Phylum Porifera
Needle-like spikes present on skeleton of sponges are called:
needles
stinging cells
defensive cells
spicules
spicules
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In sponges, exchange of water and diffusion is carried out by process of:A. osmosis
B. active transport
C. diffusion
D. passive transport
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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