Chordates and fishes

📘 Multiple-Choice Practice – Chordates & Fishes1. Which of the following is not a characteristic found in all chordates?

A. Dorsal hollow nerve cord
B. Notochord
C. Pharyngeal gill slits
D. Vertebrae
Correct Answer: D

2. Which two groups are the only non-vertebrate chordates?

A. Sharks and rays
B. Lancelets and tunicates
C. Hagfish and lamprey
D. Ray-finned and lobe-finned fishes
Correct Answer: B

3. What defines vertebrates?

A. Paired fins
B. Cartilage skeleton
C. Backbone (vertebral column)
D. Gills
Correct Answer: C

4. How do lamprey eat?

A. By filter feeding
B. By suction feeding on prey and rasping tissues
C. By swallowing prey whole
D. By using jaws to bite chunks
Correct Answer: B

5. Which two evolutionary traits separate most vertebrates from lamprey?

A. Lungs and four limbs
B. Jaws and paired fins
C. Swim bladders and gill slits
D. Amniotic eggs and vertebrae
Correct Answer: B

6. Jaws evolved from which structure?

A. Swim bladder
B. Notochord
C. Cartilaginous gill arches
D. Operculum
Correct Answer: C

7. Which of the following is a cartilaginous fish?

A. Tuna
B. Trout
C. Shark
D. Lungfish
Correct Answer: C

8. Which trait is shared by all cartilaginous fishes?

A. Bony skeleton
B. Operculum
C. Cartilage skeleton
D. Swim bladder
Correct Answer: C

9. What structure protects the gills of ray-finned fishes?

A. Operculum
B. Swim bladder
C. Gill arch
D. Lamellae
Correct Answer: A

10. What helps ray-finned fishes regulate their buoyancy (depth)?

A. Lamellae
B. Swim bladder
C. Lobed fins
D. Operculum
Correct Answer: B

11. Lobe-finned fishes are important because their lobed fins are the evolutionary basis for what?

A. Ray-finned fishes
B. Cartilage skeletons
C. Four limbs
D. Swim bladders
Correct Answer: C

12. Where did primitive lungs appear?

A. Ray-finned fishes
B. Early fish ancestors (before swim bladders)
C. Amphibians
D. Reptiles
Correct Answer: B

13. What gill structure increases surface area for gas exchange in fish?

A. Operculum
B. Swim bladder
C. Lamellae
D. Lateral line
Correct Answer: C

14. What is the correct order of evolutionary traits from fish to land animals (as shown in the PDF tree)?

A. Amniotic egg → jaws → lobed fins
B. Jaws → bony skeleton → lobed appendages → four limbs
C. Lungs → vertebrae → paired fins
D. Operculum → amniotic egg → jaws
Correct Answer: B

15. Amphibians need moist environments because:

A. They cannot breathe air
B. They have cartilage skeletons
C. They lack amniotic eggs
D. Their vertebrae are undeveloped
Correct Answer: C

16. Which group includes 99% of all fish species?

A. Cartilaginous fishes
B. Jawless fishes
C. Ray-finned fishes
D. Lobe-finned fishes
Correct Answer: C

17. Fish that do NOT pump water with their mouths (e.g., sharks) breathe by:

A. Absorbing oxygen through their skin
B. Constantly swimming
C. Using lungs
D. Using their operculum
Correct Answer: B

18. Which group contains the ancestors of amphibians?

A. Ray-finned fishes
B. Lobe-finned fishes
C. Cartilaginous fishes
D. Jawless fishes
Correct Answer: B

19. Which adaptation allowed animals to fully reproduce on land?

A. Four limbs
B. Amniotic egg
C. Gill slits
D. Operculum
Correct Answer: B

20. What are the three major groups of amphibians?

A. Sharks, rays, and skates
B. Frogs/toads, salamanders, caecilians
C. Lamprey, hagfish, sharks
D. Lungfish, coelacanths, trout
Correct Answer: B