Chapter 33 Clickers

Which characteristic is absent from echinoderms? A. Bilateral symmetry in adults B. Three tissue layers C. Water vascular system D. Sexual reproduction E. Endoskeleton

A. Bilateral symmetry in adults, they have modified radial symmetry

Which organ is absent from echinoderms? A. Brain B. Digestive gland C. Gonads D. Stomach

A. Brain

While snorkeling, a student observes an active marine animal that has a series of muscular tentacles bearing suckers. Tentacles are closely associated with its head, and a pair of large, well-developed eyes is evident. This animal belongs to which class of mollusks? A. Cephalopoda B. Gastropoda C. Bivalva

A. Cephalopoda

The worm body plan found in flat worms, annelids, & nematodes is likely... A. The result of convergence B. Because of common ancestry C. Horizontal gene transfer

A. The result of convergence

Which of these statements about lophotrochozoans is NOT true? A. They have indeterminate cleavage B. They have bilateral symmetry C. Most have a trochophore larva or a lophophore D. Their mouth develops from the blastopore

A. They have indeterminate cleavage

Because Platyhelminthes are so flat... A. They have no need for respiratory/circulatory systems. B. They must molt to grow. C. Their bones are external. D. They are often venomous.

A. They have no need for respiratory/circulatory systems.

Arthropods are segmented.. A. True B. False

A. True

The arthropods are the most diverse and abundant animals A. True B. False

A. True

You can divide a four-cell deuterostome embryo into four separate cells and potentially get four growing embryos. A. True B. False

A. True

The water vascular system of echinoderms... A. functions in locomotion and feeding B. Is bilateral in organization, even though the adult animal is not bilaterally symmetrical C. is analogous to the gastrovascular cavity of flatworms D. is also found in other deuterostome phyla

A. functions in locomotion and feeding

One of the characteristics unique to animals is.. A. nervous system. B. mitochondria. C. sexual reproduction. D. multicellularity. E. heterotrophy.

A. nervous system.

Which feature of flatworms most directly allowed for a more active predatory lifestyle? A. Three cell layers B. Cephalization C. Incomplete digestive system D. Flat body plan

B. Cephalization

Arthropod exoskeletons are made primarily of.. A. Peptidoglycan B. Chitin C. Cellulose D. Collagen E. Starch

B. Chitin

Insects have lungs... A. True B. False

B. False, they have a trachea

Molluscs do not have.. A. Bilateral symmetry B. Internal bony skeleton C. Cephalization D. Circulatory system E. Three tissue layers

B. Internal bony skeleton

The most defining characteristic of Ecdysozoans is.. A. Hinged limbs B. Molting C. Terrestrial habitat D. Predatory lifestyle E. Tastiness

B. Molting

Which tissue is usually derived from the mesoderm? A. Skin B. Muscles C. Lining of gut

B. Muscles

We say that corals don't have true muscle because... A. Polyps are sessile B. They are diploblastic C. They don't have true tissues. D. Symbiotic dinoflagellates perform that function for them.

B. They are diploblastic

Which cells in a sponge are primarily responsible for trapping and removing food particles from circulating water? A. mesoglea cells B. choanocytes C. amoebocytes D. pore cells (porocytes)

B. choanocytes

Which of the following has the smallest SA:V ratio? ' A. A coccus-shaped bacterium B. A flatworm that fits on a dime C. A cuttlefish the size of a basketball D. Fungal hyphae

C. A cuttlefish the size of a basketball

Which of these is one possible reason for the increase in animal diversity in the Cambrian explosion? A. Large increase in food on land due to diversification of gymnosperms B. Sudden increase in available CO2 C. Complex predator-prey interactions D. Decrease in ozone levels

C. Complex predator-prey interactions

Which of these traits is unique to poriferans among the animals? A. They have a blastula stage during development. B. They are multicellular. C. They lack tissues. D. They are sessile as adults. E. They can reproduce asexually.

C. They lack tissues.

How many tissue layers do bilateral animals possess? A. 0 B. 1 C. 2 D. 3 E. Usually hundreds

D. 3

Which of the following is not an insect? A. A wasp B. A fly C. A beetle D. A scorpion E. An ant

D. A scorpion, they are apart of the arthropod group Chelicerata

The Cnidaria... A. Breathe with their gills B. Have a complete digestive tract C. Have a brain D. Are capable of extracellular digestion

D. Are capable of extracellular digestion

Which of these are sponges most likely to feed on? A. Fish B. Sunlight C. Kelp D. Diatoms E. Mushrooms

D. Diatoms

Which of the following is NOT true of arthropods: A. Have an exoskeleton made of chitin B. Have jointed appendages C. Have well-developed sensory systems D. Have a closed circulatory system E. Have a complete gut

D. Have a closed circulatory system

This cnidarian alternates between a medusa and a polyp. It is a... A. Scyphozoan B. Parazoan C. Anthozoan D. Hydrozoan

D. Hydrozoan

Which characteristic is shared by both cnidarians and flatworms? A. Radial symmetry B. Cephalization C. Dorsoventrally flattened bodies D. Lack of circulatory system E. 3 tissue layers

D. Lack of circulatory system

Which is true of protostomes and not deuterostomes? A. They are segmented. B. Their development includes metamorphosis C. They have internal hard skeletons. D. Their blastopore becomes their mouth. E. They are often sessile as adults.

D. Their blastopore becomes their mouth.

Which of the following statements about nematodes is incorrect? A. They are found in most aquatic habitats. B. They have no circulatory system. C. They include many species that parasitize plants and animals. D. They are acoelomates E. They have a tough cuticle

D. They are acoelomates

Which of these traits is found in the Cnidaria but not bilateral animals? A. They have a nervous system. B. They are multicellular. C. They are sessile as adults. D. They have two tissue layers. E. They move primarily with water currents for part of their life cycle.

D. They have two tissue layers.

Which of these is an example of an animal with a gametic life cycle? A. Sponge B. Sea anemone C. Coral D. Jellyfish E. All of the above

E. All of the above

Which of the following is NOT a true statement about nematodes? A. Have a collagen cuticle that protects the body B. Possess a pseudocoelom C. Have a complete digestive tract D. Move by undulations E. They are all parasitic

E. They are all parasitic

Which of the following is not one of the major lineages of living arthropods? A. chelicerates B. myriapods C. crustaceans D. insects E. ophiuroids

E. ophiuroids