1. The outer covering of ecdysozoans a. is always hard and rigid.
b. is always thin and flexible.
c. is present at some stage in the life cycle but not always among adults.
d. ranges from very thin to hard and rigid.
e. prevents the animals from changing their shapes.
2. The primary support for members of several small phyla of marine worms is a. their exoskeletons.
b. their internal skeletons.
c. their hydrostatic skeletons.
d. the surrounding sediments.
e. the bodes of other animals within which they live.
3. Roundworms are abundant and diverse because a. they are both parasitic and free-living and eat a wide variety of foods.
b. they are able to molt their exoskeletons.
c. their thick cuticle enables them to move in complex ways.
d. their body cavity is a pseudocoelom.
e. their segmented bodies enable them to live in many different places.
4. The arthropod exoskeleton is composed of a a. mixture of several kinds of polysaccharides.
b. mixture of several kinds of proteins.
c. single complex polysaccharide called chitin.
d. single complex protein called arthropodin.
e. mixture of layers of proteins and a polysaccharide called chitin.
5. Which phyla are arthropod relatives with unjointed legs? a. Trilobita and Onychophora b. Onychophora and Tardigrada c. Trilobita and Tardigrada d. Onychophora and Chelicerata e. Tardigrada and Chelicerata
6. The members of which crustacean group are probably the most abundant of all animals?
a. Decapoda b. Amphipoda c. Copepoda d. Cirripedia e. Isopoda
7. The body plan of insects is composed of which of the three following regions?
a. Head, abdomen, and trachea b. Head, abdomen, and cephalothorax c. Cephalothorax, abdomen, and trachea d. Head, thorax, and abdomen e. Abdomen, trachea, and mantle
8. Insects that hatch from eggs into juveniles that resemble miniature adults are said to have a. instars.
b. neopterous development.
c. accelerated development.
d. incomplete metamorphosis.
e. complete metamorphosis.
9. Which of the following groups of insects cannot fold their wings back against the body?
a. Beetles b. True bugs c. Earwigs d. Stone flies e. Mayflies
10. Factors that may have contributed to the remarkable evolutionary diversification of insects include a. the terrestrial environments penetrated by insects lacked any other similar organisms.
b. insects evolved the ability to fly.
c. some lineages of insects evolved complete metamorphosis.
d. insects evolved effective means of delivering oxygen to their internal tissues.
e. All of the above
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.