Bio 102 Exam II Review – Study Guidance and Practice Questions

Q1. Which phylum has a water vascular system?

Background

Topic: Invertebrate Diversity – Echinoderms

This question tests your understanding of the unique physiological systems found in different animal phyla, specifically the water vascular system.

Key Terms:

• Water vascular system: A network of hydraulic canals unique to one animal phylum, used for locomotion, feeding, and gas exchange.

• Phylum: A major taxonomic group of animals, such as Mollusca, Echinodermata, Cnidaria, Annelida, Arthropoda.

Step-by-Step Guidance

1. Recall which animal groups are included in each phylum listed in the options.

2. Think about the defining features of each phylum, especially any unique organ systems.

3. Review which group includes sea stars, sea urchins, and their relatives, as these organisms possess a water vascular system.

4. Eliminate phyla that are known for other systems (e.g., open circulatory system, nerve nets, etc.).

Try solving on your own before revealing the answer!

Q2. A major difference between the two divisions of annelids, the errantians and sedentarians, is that _____.

Background

Topic: Annelid Diversity

This question focuses on the differences between two major groups within the phylum Annelida, which includes segmented worms.

Key Terms:

• Errantians: Mostly mobile, marine annelids with parapodia.

• Sedentarians: Less mobile annelids, often burrowers or tube-dwellers.

• Parapodia: Paired, unjointed lateral outgrowths used in locomotion and respiration.

Step-by-Step Guidance

1. Recall the main characteristics of errantians and sedentarians.

2. Think about their mobility and anatomical features (e.g., presence or absence of parapodia).

3. Consider which group includes leeches and which is more likely to be marine or terrestrial.

4. Eliminate options that do not fit the definitions of these two groups.

Try solving on your own before revealing the answer!

Q3. Which statement about arthropods is incorrect?

Background

Topic: Arthropod Structure and Function

This question tests your knowledge of the defining features and adaptations of arthropods, the largest animal phylum.

Key Terms:

• Arthropods: Invertebrates with exoskeletons, segmented bodies, and jointed appendages.

• Open circulatory system: Circulatory fluid (hemolymph) is not always contained within vessels.

• Cuticle: The tough, flexible outer covering of arthropods.

Step-by-Step Guidance

1. Review the general characteristics of arthropods, including their circulatory system, sensory organs, and body covering.

2. Identify which statements are true for all arthropods and which might be exceptions or incorrect.

3. Pay attention to the location of sensory organs and the structure of the cuticle.

4. Eliminate statements that are accurate, leaving the one that is not correct.

Try solving on your own before revealing the answer!

Q4. Your friend, who was setting up a lab on arthropods for your class, put out specimens of the following groups. Which needs to be removed?

Background

Topic: Arthropod Classification

This question asks you to distinguish between arthropod groups and non-arthropod groups.

Key Terms:

• Chelicerates: Arthropods including spiders, scorpions, and horseshoe crabs.

• Myriapods: Arthropods including centipedes and millipedes.

• Pancrustaceans: Arthropods including crustaceans and insects.

• Nematodes: Roundworms, not arthropods.

Step-by-Step Guidance

1. Recall which groups are classified as arthropods and which are not.

2. Identify the defining features of each group listed.

3. Determine which group does not belong with the others based on phylum classification.

4. Eliminate the groups that are true arthropods.

Try solving on your own before revealing the answer!

Q5. If you discovered a new organism with 10 jointed legs, you would expect it to also have _____.

Background

Topic: Arthropod Anatomy

This question tests your ability to connect anatomical features (jointed legs) with other characteristics of arthropods.

Key Terms:

• Exoskeleton: A hard outer structure that provides support and protection.

• Muscles attached to exoskeleton: A feature of arthropods that allows movement.

Step-by-Step Guidance

1. Recall which animal groups have jointed legs and what other features are associated with them.

2. Think about the function of an exoskeleton and how muscles interact with it in these animals.

3. Eliminate options that are not typically found in animals with jointed legs.

4. Focus on the relationship between jointed appendages and the exoskeleton.

Try solving on your own before revealing the answer!

Q6. Which traits are shared by all chordates? (Select 1 of 4 possibly correct answers)

Background

Topic: Chordate Characteristics

This question tests your knowledge of the four key features that define chordates at some stage in their life cycle.

Key Terms:

• Notochord: A flexible rod that supports the body.

• Pharyngeal slits: Openings in the pharynx that develop into gill structures or other features.

• Muscular post-anal tail: A tail that extends beyond the anus.

• Dorsal, hollow nerve cord: A nerve cord located dorsally (on the back) and is hollow.

Step-by-Step Guidance

1. Recall the four defining characteristics of chordates.

2. Review which features are present in all chordates at some point in their development.

3. Eliminate any features that are not universal to all chordates.

4. Choose the correct trait(s) from the options provided.

Try solving on your own before revealing the answer!

Q7. Based on the picture, the skeletal components of jaws are derived from which of the four shared derived characters of chordates?

Background

Topic: Evolution of Vertebrate Features

This question asks you to connect anatomical structures (jaws) to their evolutionary origins in chordates.

Key Terms:

• Pharyngeal arches: Structures in the embryonic pharynx that give rise to various features, including jaws in vertebrates.

Step-by-Step Guidance

1. Examine the diagram showing the development of jaws from skeletal rods.

2. Recall which chordate feature gives rise to the skeletal elements in the head and neck region.

3. Identify the correct shared derived character from the list (notochord, dorsal hollow nerve cord, pharyngeal arches, post-anal tail).

4. Connect the labeled structures in the image to the correct answer.

Try solving on your own before revealing the answer!