Mollusca 39. Know how to classify molluscs according to the 4 animal body plan f

Question

Mollusca 39. Know how to classify molluscs according to the 4 animal body plan features (see#8) 40. Be able to explain the two general feeding methods of molluscs (suspension feeding and using a radula). For each type, how do molluscs capture, ingest, and digest food? Be able to talk about features of their body plan that allow them to do this efficiently 1. Do molluscs have a complete gut? A circulatory system? A skeleton? How do they move? Are they segmented? Nervous system? Excretory system? 42. Do any molluscs have trochophore larvae? Which ones? 43. Know the following vocab words that are specific to molluscs: radula, beak, chiton, visceral mass, mantle, foot. 44. Compare and contrast the 4 mollusc classes with respect to the morphology and use of their gills, foot, shell, and radula. Previous Next ? IoD

Explanation / Answer

39. Ans-
All mollusks have the same fundamental body plan that consists of four distinct body part such as a head, a visceral mass and a mantle and foot.
40. Ans-
The mollusks have different types of feeding mechanisms. The two general feeding methods of mollusks include:
A.   Radula that covered with rasping teeth help to scrape algae from the rock
B.   The bivalve mollusks are filter-feeder and can extract particles from the water

Cephalopods, octopuses, and squids capture their prey with the help of tentacles and hold them with their suckers. With the help of radula and chitinous beak, they kill and eat their prey.The bivalve mollusks are filter-feeder and can extract particles from the water.
Mollusks have a very complex digestive system. The digestive system starts with a mouth. Their radulae consist of small teeth that scrape algae and bacteria from rocks and digestive glands secrete mucus in the mouth to trap food. Large particles are digested in the stomach and smaller particles are excreted.
41.Ans-
Yes, mollusks have a complete gut and all have an open circulatory system.
Mollusks do not have skeleton system in the body.
They have a muscular foot that helps them dig and attach to rocks. It is used for travel, not used for movement.
Mollusks have well developed nervous system and excretory system, but lack body segmentation. Their excretory system consists of nephridia.
42. Ans-
Yes, a trochophore larva found in all mollusks.

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