Question 7 (2 points) Planarians are free-living Platyhelminths (you saw a video

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Question 7 (2 points) Planarians are free-living Platyhelminths (you saw a video of) that typically feed by sweeping food into their open mouth with cilia filtering small particles from water using their extendable pharynx to ingest food paralyzing small crustaceans with stinging cells Save Question 8 (2 points) Which of the following list of features describes the molluscs and bivalves but not the annelids Presence of cephalization, contain a muscular foot and a mantle, may posses a hard outer shell and have a complete digestive system. Lack of cephalization, contain a muscular foot and a mantle, may posses a hard outer shell and have a complete digestive system. Presence of cephalization, every member of the group will have a hard outer shell as well as a complete digestive system. Lack of cephalization, contains circular muscles that enable them to move, may posses a hard outer shell and have a complete digestive system. Save Question 9 (2 points) G

Explanation / Answer

Q7- Planaria feed by using their extendable pharynx to ingest food.

Planaria 1st uses digestive enzymes from the mouth to carry out external digestion. After then the muscular pharynx absorbes the food and transfers it to the gastrovascular cavity where it gets further digested.

Q8- Ans- Lack of cephalisation, contains a muscular foot, a mantle, may posses a hard outer shell and have complete digestive system.

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