Thought Questions 15. H ow does the process of acquiring and digesting food in c

Question

Thought Questions 15. H ow does the process of acquiring and digesting food in cnidarians differ from the process in sponges? The anterior end of an animal is often referred to as a head. The anterior end of a tapeworm is referred to as a scolex. Ex 16. plain why a different word is used for the anterior end of the tapeworm. 17. a. Do the animals with a gastrovascular cavity have a body cavity? b. How do the animals with a pseudocoelom digest their food? c. What advantage is there to having a body cavity and a separate mouth and anus?

Explanation / Answer

15. Planktons are captured by the cells of sponges via filtering. Sponges possess intracellular digestion. Pores of their collar cells are the entry region of food.

Cnidarians are predators. Those take small fishes as there food. They have no organ of digestion. A gastrovascular cavity is involved in digestion. Food intake is done by diffusion.

16. Scolex is a knoblike head, parasites are anchored by it. Suckers or hooks are present in this portion. These are not used for feeding. This is only used for attachment.

17. A.Gastrovascular and body cavity is same .

B. Food is collected via blood and distributed throughout the pseudocelomic fluid. Foods that are digested in the intestine of host, those are absorbed by the skin of the organism.

C. The cavity is felxible to set all the organs easily. Internal organs are cushioned

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