Which of the following cells make the outer layer of the body walls in porifera?
a) pinacocytes
b) chondrocytes
c) choanocytes
d) osteocytes
Explanation: the outer layer is called pinacoderm. These cells are flattened
Which of the following cells make the inner layer of the body walls in porifera?
a) pinacocytes
b) amoebocytes
c) choanocytes
d) osteocytes
Explanation: the outer layer is called choanoderm. These cells are flagellated collar cells
Which of the following cells make special mobile cells which bring food to spongocoel in porifera?
a) pinacocytes
b) amoebocytes
c) choanocytes
d) osteocytes
Which of the following cells in porifera are not nutritive but ova and sperms are develop from them?
a) pinacocytes
b) amoebocytes
c) choanocytes
d) osteocytes
The
digestion in animals belonging to phylum porifera is………
a) intracellular
b) extracellular
c) both a and b
d) either a or b
Explanation: inside the body cell (intracellular digestion), in the spongocoel (extracellular digestion)
Which of the following is/are included in the food source of porifera?
a) phytoplanktons
b) zooplanktons and protozoans
c) small organisms
d) all of these
Explanation: but 80% of food comprises of dead organic matter
