Which of the following is NOT a characteristic of sponges (Phyla Calcarea and Silicea)?a) They lack true tissues and organs.b) They are sedentary suspension feeders.c) They are diploblastic.d) They contain flagellated collar cells called choanocytes
Question
Which of the following is NOT a characteristic of sponges (Phyla Calcarea and Silicea)?a) They lack true tissues and organs.b) They are sedentary suspension feeders.c) They are diploblastic.d) They contain flagellated collar cells called choanocytes
Solution
The correct answer is c) They are diploblastic.
Here's why:
a) Sponges do lack true tissues and organs. They are made up of a loose aggregation of cells.
b) Sponges are indeed sedentary suspension feeders. They remain attached to a spot and filter food particles out of the water.
c) Sponges are not diploblastic. Diploblastic organisms have two germ layers, the ectoderm and endoderm. Sponges, however, are considered to be neither diploblastic nor triploblastic because they do not have true tissues.
d) Sponges do contain flagellated collar cells called choanocytes. These cells create a water current and help in the feeding process.
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