1. Which of the following is a characteristic of the phylum Porifera?
A. Bilateral symmetry
B. Notochord
C. Pores on the body
D. Jointed appendages
Answer: C. Pores on the body
2. Which of the following structures is used for water circulation in sponges?
A. Nematocysts
B. Flame cells
C. Choanocytes
D. Nephridia
Answer: C. Choanocytes
3. The specialized cells in Cnidaria responsible for stinging and capturing prey are called:
A. Nematocysts
B. Amoebocytes
C. Collar cells
D. Statocysts
Answer: A. Nematocysts
4. Which phylum includes organisms with a gastrovascular cavity and radial symmetry?
A. Arthropoda
B. Cnidaria
C. Annelida
D. Mollusca
Answer: B. Cnidaria
5. Flatworms belong to which phylum?
A. Porifera
B. Platyhelminthes
C. Nematoda
D. Echinodermata
Answer: B. Platyhelminthes
6. The body cavity in Nematoda is:
A. Absent
B. True coelom
C. Pseudocoelom
D. Hemocoel
Answer: C. Pseudocoelom
7. Which of the following is not a characteristic of annelids?
A. Segmentation
B. Closed circulatory system
C. Jointed appendages
D. Hydrostatic skeleton
Answer: C. Jointed appendages
8. The excretory organs of annelids are:
A. Nephridia
B. Malpighian tubules
C. Flame cells
D. Green glands
Answer: A. Nephridia
9. Which phylum is characterized by jointed appendages and an exoskeleton made of chitin?
A. Mollusca
B. Echinodermata
C. Arthropoda
D. Annelida
Answer: C. Arthropoda
10. Which of the following classes is part of the phylum Arthropoda?
A. Cephalopoda
B. Insecta
C. Asteroidea
D. Amphibia
Answer: B. Insecta
11. The radula is a structure found in which phylum?
A. Cnidaria
B. Annelida
C. Mollusca
D. Echinodermata
Answer: C. Mollusca
12. The water vascular system is a characteristic feature of:
A. Arthropoda
B. Echinodermata
C. Mollusca
D. Chordata
Answer: B. Echinodermata
13. The symmetry found in adult echinoderms is:
A. Bilateral
B. Radial
C. Asymmetry
D. Pentaradial
Answer: D. Pentaradial
14. The phylum Chordata is characterized by the presence of:
A. Exoskeleton
B. Nematocysts
C. Notochord
D. Water vascular system
Answer: C. Notochord
15. Which of the following is not a subphylum of Chordata?
A. Urochordata
B. Cephalochordata
C. Vertebrata
D. Echinodermata
Answer: D. Echinodermata
16. Amphibians are distinguished by their:
A. Fully terrestrial life cycle
B. Moist skin and dual-life adaptation
C. Scales and cold-blooded nature
D. Feathers and warm-blooded nature
Answer: B. Moist skin and dual-life adaptation
17. Which class of Chordata includes fish with a cartilaginous skeleton?
A. Osteichthyes
B. Chondrichthyes
C. Amphibia
D. Reptilia
Answer: B. Chondrichthyes
18. Reptiles are primarily adapted for life on land due to:
A. External fertilization
B. Moist skin
C. Amniotic eggs
D. Gills
Answer: C. Amniotic eggs
19. Birds are characterized by which of the following adaptations for flight?
A. Hollow bones
B. External gills
C. Moist skin
D. Lack of lungs
Answer: A. Hollow bones
20. Mammals are unique among vertebrates because of the presence of:
A. Scales
B. Mammary glands
C. Feathers
D. Gills
Answer: B. Mammary glands
21. Which phylum has organisms with a diploblastic body plan?
A. Porifera
B. Cnidaria
C. Platyhelminthes
D. Nematoda
Answer: B. Cnidaria
22. The acoelomate body plan is found in:
A. Nematoda
B. Platyhelminthes
C. Annelida
D. Arthropoda
Answer: B. Platyhelminthes
23. Which of the following groups has a true coelom?
A. Porifera
B. Annelida
C. Nematoda
D. Cnidaria
Answer: B. Annelida
24. Which class includes organisms with a three-part body (head, thorax, abdomen)?
A. Insecta
B. Cephalopoda
C. Asteroidea
D. Amphibia
Answer: A. Insecta
25. The mantle cavity in mollusks contains:
A. Nervous tissue
B. Digestive glands
C. Gills or lungs
D. Excretory organs
Answer: C. Gills or lungs
26. The larval stage of echinoderms exhibits:
A. Radial symmetry
B. Bilateral symmetry
C. Asymmetry
D. Pentaradial symmetry
Answer: B. Bilateral symmetry
27. Sharks belong to which class?
A. Osteichthyes
B. Chondrichthyes
C. Amphibia
D. Mammalia
Answer: B. Chondrichthyes
28. Cephalochordates are commonly known as:
A. Lancelets
B. Tunicates
C. Starfish
D. Sea cucumbers
Answer: A. Lancelets
29. Which animal phylum includes the largest number of species?
A. Arthropoda
B. Mollusca
C. Chordata
D. Annelida
Answer: A. Arthropoda
30. Which feature is common to all Chordates at some stage of their development?
A. Exoskeleton
B. Jointed legs
C. Pharyngeal slits
D. Radial symmetry
Answer: C. Pharyngeal slits
