Invertebrate Zoology Exam #2 15-November-2005
Be sure to read the directions for each section carefully.
Multiple Choice (15 Points): Circle the letter that corresponds to the correct answers. There may be no correct answers to a question, there may be one correct answer, or there may be more than one correct answer.
The Rorifers have several advanced features – relative to many of the animals we have studied thus far. Which of these are features that rotifers possess?
Which of the following phyla are blastocoelomates?
The turbellarians have pharynxes of varying complexity. Which of the following pharynxes do not require eversion to extend out of the animals body?
The phylum Priapula is well named. It is named after the Greek God of ___________________________________________________.
The Class Trematoda are commonly known as ___________________________.
One common form of asexual reproduction used by the Platyhelminthes is ________________________________________________.
The Oligochaetes have a specialized reproductive section called the ________________________.
While the scientist was lounging in the Adirondacks, she came across a leach wanting to suck her blood. “_______________________________!!!” she cried in reference to the scientific name of the subclass the leach belonged to.
A pattern of locomotion where the body undulates like a snake is known as ____________________________ locomotion.
The segmentation or serial homology in annelids – particularly during development is known as ___________________________.
The annelids use ___________________________________ to excrete wastes.
A single unit in a compound eye is known as a(n) _____________________________________.
Definitions (24 Points): Define the following terms. It is sometimes useful to include diagrams with your definitions.
Short Answers (36 Points): Provide brief answers to the following questions. Diagrams may be useful.
Describe two ways that rotifers move.
What is developmental polymorphism – what is an animal that uses it and why?
Describe the circulatory system in a sessile and errant Polychaete.
Although blastocoelomates tend to look very different, they do share many characteristics. Describe three characteristics they share.
Tradigrada are extremely tough little blighters. Part of their toughness is based on the fact that they have two dormant stages. Name to two stages and the appropriate term relating to a dramatically slowed metabolic rate and an un-measurable metabolic rate.
Explain three reasons why segmentation is such an important evolutionary step.
Describe the general path for urine formation in an animal that uses metanephridia. If you want, you can choose a specific animal.
On this schematic drawing of a crustacean limb, label the segments.
Essay Questions (20 Points): Answer these questions providing as much detail as possible. Once again, diagrams may be useful to you.
Crustaceans are an extremely successful group of invertebrates. There are many factors that make them successful – including flexibility in appendage construction and use, their ridged exoskeletons, their ability to quickly exploit a new environment…..
On the diagram below label
Protective covering over segments
Head appendages (there are three)
Head/Trunk appendages (there are two here)
Trunk appendages (five)
Abdominal appendages (seven)
Briefly explain three ways in which crustaceans get around (locomotion)
Briefly describe the hormonal control of a molt cycle in a crustacean.
How is their development similar or dissimilar to an annelids development?
Both of our recent group discussion had a great deal to do with invertebrates overcoming obstacles in order to successfully reproduce. Based on these discussions:
What are three problems that endoparasites face in terms of reproduction?
Using examples from our discussion, how do they overcome each of these obstacles?
Horseshoe crabs avoid predation by laying their eggs out of the water. This behavior creates the problem of needing eggs to hatch at the right time. List four cues that Limulus uses to trigger hatching.