Question 1Cnidocytes help a cnidarian survive by paralyzing prey. b. forming colonies. c. providing movement. d. storing food.

Question 2Which of the following does NOT have a body divided into segments? flukes b. leeches c. marine sandworms d. earthworms

Question 3Both roundworms and rotifers have complete digestive tracts. b. segmented bodies. c. radial symmetry. d. gastrovascular cavities.

Question 4An adult tapeworm uses its hooks and suckers to attach itself to the intestinal wall of its host. b. digest food. c. store fertilized eggs. d. store sperm.

Question 5Organisms that spend their entire adult lives attached to one spot are said to be a. symmetric. b. heterotrophic. c. flagellated. sessile.

Question 6In an echinoderm, the structure that operates like a living suction cup is the a. stomach. b. water vascular system. c. madreporite. tube foot.

Question 7The Cambrian explosion was a. distinguished by large numbers of dinosaurs. a burst of animal diversity that occurred about 550 million years ago. c. the first appearance of early mammals. d. a mass extinction at the end of the Cambrian period.

Question 8Which of the following groups of invertebrates are deuterostomes? a. mollusks b. worms echinoderms d. arthropods

Question 9A key characteristic of multicellular organisms is a. highly specialized cells. b. interdependent cells. c. multiple cell layers. all of the above

Question 10Mollusks have all of the following EXCEPT a a. mantle. b. complete digestive tract. closed circulatory system. d. radula.

Question 11A person who has trichinosis likely contracted it from eating undercooked meat containingTrichinellacysts. b. coming in contact withTrichinella-infested snails. c. mosquitoes. d. walking barefoot on soil infested withTrichinellaworms.

Question 12The fastest, most agile mollusks are the cephalopods. b. bivalves. c. rotifers. d. gastropods.

Question 13Filter-feeding bivalves can be used to monitor the environmental health of a habitat because a. the bivalves concentrate pollutants and microorganisms in their tissues. b. the bivalves reproduce rapidly in polluted water. c. some bivalves never get cancer. d. the bivalves live near deep-sea vents.

Question 14The echinoderms that look like warty, moving pickles are a. feather stars. sea cucumbers. c. sea urchins. d. sea stars.

Question 15Some type of body symmetry is found in all invertebrates EXCEPT a. flatworms. b. cnidarians. sponges. d. echinoderms.

Question 16Bilateral symmetry enables the a. division of the body into upper and lower sides. b. joining together of specialized cells into tissues. concentration of sense organs and nerve cells in the front of the body. d. formation of a body cavity between the cell layers.

Question 17-18

Question 17In Figure 23-1, the space labeled X is called a a. coelom. b. protostome. pseudocoelom. d. deuterostome.

Question 18One animal that has a body construction like that shown in Figure 23-1 is a roundworm. b. marine jelly. c. sponge. d. flatworm.

Question 19According to current hypotheses, which of the following did NOT occur during the Cambrian explosion? a. Animal appendages became specialized for a variety of functions. b. Animals evolved simpler body plans. c. There was an extraordinary growth in animal diversity. Animals acquired specialized cells, tissues, and organ systems.

Question 20A rotating wheel of cilia surrounds the mouth of a a. sea anemone. starfish. c. rotifer d. planarian.

Question 21Hookworms, pinworms, and threadworms are examples of a. annelids. b. marine worms. c. flatworms. roundworms.

Question 22Worms and insects are bothvertebrates. invertebrates True False

Question 23The type of body cavity shared by all mollusks is apseudocoelom. mantle True False

Question 24An echinoderm has an internal network of water-filled canals called thewater vascular system. True False

Question 25Some sponges live on lake bottoms, while others are found on theseafloor. True False

Question 26Annelids and mollusks, both of which possess acoelom, may be more closely related to each other than either is to flatworms or roundworms. True False

Question 27Leeches are parasiticroundworms. annelid True False

Question 28In clams and oysters, two shells are held together by powerful musclesa trait common to allcephalopods. Bivalves True False

Question 29Turbellaria is a class ofparasiticflatworms. Non-parasitic True False

Question 30Some sea urchins defend themselves using long, sharparms. tentacles True False

Question 31If an animals blood never comes in direct contact with its tissues, the animal has anopencirculatory system. close True False

Question 32Most sponges havetwolayers of cells. True False

Question 33Animals that do not have backbones are called invertebrates..

Question 34The life cycle of most cnidarians includes two body forms: medusas and polyps..

Question 35The first branching point in a hypothetical phylogenetic tree of animal origins separates the sponges, which are animals that lack tissues., from all other animals.

Question 36One hypothesis of animal origin is that animals evolved from protists.that lived as colonies of cells.

Question 37The foot of most cephalopods is divided into eight or more arms called tentacles..

Question 38The opening in the blastula is known as the blastopore..

Question 39Most invertebrates that rely on rapid movement for survival have bilateral.symmetry.

Question 40Cnidarians have a network of cells called a(an) nerve net.that enables them to respond to stimuli.

Question 41Tiny animals called rotifers.are named for the whirlpool-producing cilia encircling their mouths.

Question 42The class of cnidarians that includes sea anemones and most coral animals is called anthozoa..

Question 43What two fundamental characteristics distinguish animals from plants? Plants have cell wall and cytoplasm while animals don't.

Question 44What is bilateral symmetry? an organism's body has two mirror image sides.

Question 45Describe the polyp body form of cnidarians. Polyp has cylindrical body with tentacles radiating from one end.

Question 46What is the definition of a coelomate? animal lacking a body cavity

Question 47What will happen if a sea star is pulled into pieces? They can regenerate the parts.

Question 48Name three invertebrate phyla with bilateral symmetry. rotifera, annelida, and platyhelminthes

Question 49What is an advantage to having sense organs and nerve cells concentrated at the head end of the body? having sensory organs as high as possible

Question 50What is a blastopore? a hole that develops during the embryotic stages of development.

Question 51What characteristic related to development makes echinoderms different from all other invertebrates? Echinoderms live in sea unlike other invertebrate

Question 52According to a hypothetical phylogenetic tree of animal origins, which animals are more advancedanimals with radial symmetry, or animals with bilateral symmetry? animals with bilateral symmetry

Question 53-56

Question 53USING SCIENCE SKILLSInferringUse Figure 23-2 to describe the basic structure of a sponge. The body of most sponges consists of two layers of cells separated by a jelly-like material. The outer layer of cells protects the interior of the sponge and also has many pores (holes) through which water can enter the sponge. The inner layer of cells lines the central cavity of the sponge.

Question 54USING SCIENCE SKILLSAnalyzing DataWhich label in Figure 23-2 represents an amoebocyte? What is the function of amoebocytes? D represents amoebocyte. The function is to pick up food from the collar cell, digest it, and transport to other cell.

Question 55USING SCIENCE SKILLSInferringIn Figure 23-2, which label represents the structure through which a steady current of water moves into the sponge? What is this structure called? Structure B represents the structure through which a steady current of water moves into the sponge, it is called Pore.

Question 56USING SCIENCE SKILLSAnalyzing DataWhat is the structure labeled A in Figure 23-2? What is the function of this structure? The structure is collar cell. The function is to trap food from the water into the mucus.

Question 57-59

Question 57USING SCIENCE SKILLSAnalyzing DataWhat is the name of the animal shown in Figure 23-3, and in what phylum does it belong? It is an earthworm, it belongs to the phylum Annelida.

Question 58USING SCIENCE SKILLSInferringIn Figure 23-3, what are the structures labeled A? What is their function? Main Heart

Question 59USING SCIENCE SKILLSInferringIdentify structure B in Figure 23-3, and infer its relationship to structure C. B is a brain. It send information to the structure C which is a nerve cord.

Question 60-64

Question 60USING SCIENCE SKILLSAnalyzing DataFigure 23-4 shows two main types of digestive systems found in invertebrates. Identify the type of digestive system shown in A. digestive sac

Question 61USING SCIENCE SKILLSClassifyingName two phyla of invertebrates that have the type of digestive system shown in A in Figure 23-4. Cnidaria and

Question 62USING SCIENCE SKILLSAnalyzing DataIdentify the type of digestive system shown in B in Figure 23-4. Complete digestive tract

Question 63USING SCIENCE SKILLSClassifyingName two phyla of invertebrates that have the type of digestive system shown in B in Figure 23-4. Annelida and Echinodermata

Question 64USING SCIENCE SKILLSInferringDescribe the passage of food through the digestive system shown in B in Figure 23-4. Food enter through mouth, and move to digestive tract, then the food that was digested by digestive tract go out through anus.

Question 65Compare and contrast cnidarians, mollusks, and echinoderms in terms of body symmetry and presence of a body cavity. IDK

Question 66Worms, insects, birds, and dogs are all grouped together in the Kingdom Animalia. Why do scientists place such diverse organisms in the same group? because they are all eukaryotic and multicellular.

Question 67Describe the feeding behavior of cnidarians. Cnidarians first paralyze their prey with stinging cells on their tentacles then they slowly move the food up into the belly to digest. They have no distinct mouth or anus so the food goes in and out around the same place.

Question 68How are tapeworms well adapted to living and reproducing inside the body of a host? The tapeworms absorb nutrients across their body surface from digested food in their hosts intestines. Each segment of the tapeworm contains reproductive organs that produce eggs.

Question 69Describe the characteristic of bilateral symmetry in animals. How does this body plan help an animal carry out essential functions? IDK

Question 70Describe the organization of nervous systems in cnidarians, flatworms, and mollusks. IDK

Question 71Explain how echinoderms can survive without a specialized circulatory, respiratory, or excretory system. They have a water vascular system, which is an internal network of fluid-filled canals

Question 72How do sponges differ from other animals? They can adjust their cell shape, moving body cells and changing their function as needed