Exam 33: An Introduction to Invertebrates

Use the following information to answer the questions below. Nudibranchs, a type of predatory sea slug, can have various protuberances (i.e., extensions) on their dorsal surfaces. Rhinophores are paired structures, located close to the head, which bear many chemoreceptors. Dorsal plummules, usually located posteriorly, perform respiratory gas exchange. Cerata usually cover much of the dorsal surface and contain nematocysts at their tips. -Nudibranchs usually have two rhinophores. However, if they had a single rhinophore, it could still carry out the function of two rhinophores, and with similar effectiveness, if this single rhinophore

The water vascular system of echinoderms

Against which hard structure do the circular and longitudinal muscles of annelids work?

The teacher and class were especially saddened when the colonial hydrozoan died. They had watched it carefully, and the unfortunate creature never even got to produce offspring by budding. Yet, everyone was elated when Tommy (now recovered)noticed a small colonial hydrozoan growing in a part of the tank far from the location of the original colony. The teacher was apparently unaware that these hydrozoans exhibit

Use the following information to answer the questions below. Nudibranchs, a type of predatory sea slug, can have various protuberances (i.e., extensions) on their dorsal surfaces. Rhinophores are paired structures, located close to the head, which bear many chemoreceptors. Dorsal plummules, usually located posteriorly, perform respiratory gas exchange. Cerata usually cover much of the dorsal surface and contain nematocysts at their tips. -The claws on the foremost trunk segment of centipedes have a function most similar to that of

The members of which clade in the phylum Cnidaria occur only as polyps?

Use the following information to answer the questions below. Nudibranchs, a type of predatory sea slug, can have various protuberances (i.e., extensions) on their dorsal surfaces. Rhinophores are paired structures, located close to the head, which bear many chemoreceptors. Dorsal plummules, usually located posteriorly, perform respiratory gas exchange. Cerata usually cover much of the dorsal surface and contain nematocysts at their tips. -The spines of sea stars have a function most similar to that of

Use the following information to answer the questions below. Nudibranchs, a type of predatory sea slug, can have various protuberances (i.e., extensions) on their dorsal surfaces. Rhinophores are paired structures, located close to the head, which bear many chemoreceptors. Dorsal plummules, usually located posteriorly, perform respiratory gas exchange. Cerata usually cover much of the dorsal surface and contain nematocysts at their tips. -If nudibranch rhinophores are located at the anteriors of these sea slugs, then they contribute to the sea slugs'

The excretory organs of annelids are

Sponges are most accurately described as

How many of the following are characteristics of arthropods? 1. protostome development 2. bilateral symmetry 3. a pseudocoelom 4. three embryonic germ layers 5. a closed circulatory system

Which phylum is characterized by animals that have a segmented body?

Use the following information to answer the questions below. A farm pond, usually dry during winter, has plenty of water and aquatic pond life during the summer. One summer, Sarah returns to the family farm from university. Observing the pond, she is fascinated by some six-legged organisms that can crawl about on submerged surfaces or, when disturbed, seemingly "jet" through the water. Watching further, she is able to conclude that the "mystery organisms" are ambush predators, and their prey includes everything from insects to small fish and tadpoles. -Sarah observed that the mystery pond organisms never come up to the pond's surface. If she catches one of these organisms and observes closely, perhaps dissecting the organism, she should find

Which clade in the phylum Cnidaria includes "jellies" with rounded (as opposed to boxlike)medusae?

Use the following graph to answer the questions below. Percent of sea slug respiratory carbon demand provided by indwelling dinoflagellates. -According to the graph, during which season(s)of the year is the relationship between the sea slug and its dinoflagellates closest to being commensal?

Use the following graph to answer the questions below. Percent of sea slug respiratory carbon demand provided by indwelling dinoflagellates. -If the dinoflagellate-containing sea slug P. ianthina otherwise preys on coral animals, then it would be least surprising to find that

How many of the following can be used to distinguish a nematode worm from an annelid worm? 1. type of body cavity 2. number of muscle layers in the body wall 3. presence of segmentation 4. number of embryonic tissue layers 5. shape of worm in cross-sectional view

In terms of food capture, which sponge cell is most similar to the cnidocyte of a cnidarian?

Which of the following is found only among annelids?

Use the following graph to answer the questions below. Percent of sea slug respiratory carbon demand provided by indwelling dinoflagellates. -The sea slug Elysia chorotica has no nematocysts or dinoflagellates but, rather, has "naked" chloroplasts in its skin. The chloroplasts are all that remain of the seaweed (Vaucheria sp.)that Elysia feeds upon. The chloroplasts are transferred to the skin; consequently, this slug is green. It spends most of its time basking in shallow water on the surface of seaweeds. How should we expect its chloroplasts to benefit the Elysia sea slug? 1. provide Elysia with fixed CO₂ 2. provide Elysia with fixed N₂ 3. provide Elysia with protective colouration