80% of the food of sponges consists of__________?
Correct answer: A. Detrital organic particles
- A. Detrital organic particles
- B. Zooplankton and small animals
- C. Phytoplanktons
- D. all of these
Explanation
Sponges obtain most of their food by filtering fine detrital organic particles from the water, which are taken up by collar cells and other feeding cells. Zooplankton and phytoplankton can also be consumed, but they are not the category identified here as making up about 80 percent. Students may choose d because all listed materials can occur in the diet, confusing possible food items with the major proportion.
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