Questions on Annelids (phylum Annelida)
Annelids – Multiple Choice Questions
1. Which of the following is a key characteristic of annelids?
A) Radial symmetry
B) Segmented body
C) Exoskeleton
D) Pseudocoelom
E) Jointed appendages
2. Which of the following animals is an annelid?
A) Snail
B) Earthworm
C) Spider
D) Starfish
E) Jellyfish
3. Annelids are classified under which type of body cavity?
A) Acoelomate
B) Pseudocoelomate
C) Coelomate
D) Hemocoel
E) No cavity
4. What is the name of the body segments in annelids?
A) Setae
B) Parapodia
C) Metameres
D) Nephridia
E) Septa
5. What structure helps in locomotion in many annelids, especially earthworms?
A) Parapodia
B) Cilia
C) Setae
D) Antennae
E) Pseudopodia
6. Which organ system is segmented in annelids?
A) Circulatory
B) Nervous
C) Excretory
D) Muscular
E) All of the above
7. The excretory organs of annelids are called:
A) Nephridia
B) Kidneys
C) Spiracles
D) Malpighian tubules
E) Antennae
8. How do earthworms reproduce?
A) Asexually by budding
B) Through external fertilization only
C) Hermaphroditic sexual reproduction
D) Binary fission
E) Parthenogenesis
9. Which class of annelids includes marine worms with parapodia?
A) Oligochaeta
B) Hirudinea
C) Polychaeta
D) Turbellaria
E) Cephalopoda
10. What is the function of the clitellum in earthworms?
A) Movement
B) Feeding
C) Circulation
D) Reproduction
E) Respiration
11. Annelids have what kind of circulatory system?
A) Open
B) None
C) Closed
D) Double-looped
E) Lymphatic
12. Leeches belong to which annelid class?
A) Polychaeta
B) Oligochaeta
C) Hirudinea
D) Nematoda
E) Arthropoda
13. What structure separates internal segments in annelids?
A) Septa
B) Setae
C) Clitellum
D) Cuticle
E) Gills
14. The nervous system of annelids includes:
A) A single nerve cord
B) No brain
C) A dorsal nerve cord
D) A brain and ventral nerve cord
E) Only sensory nerves
15. Which of the following is not a function of parapodia in polychaetes?
A) Respiration
B) Locomotion
C) Feeding
D) Gas exchange
E) Swimming
16. Which type of symmetry do annelids possess?
A) Asymmetry
B) Radial
C) Bilateral
D) Spherical
E) Pentamerous
17. How do annelids typically exchange gases?
A) Through lungs
B) Through spiracles
C) Through gills only
D) Across the skin or parapodia
E) Through tracheal tubes
18. What is the role of setae in annelids?
A) Feeding
B) Respiration
C) Sensory detection
D) Anchoring and movement
E) Reproduction
19. Which annelid is used in medicine for bloodletting and producing anticoagulants?
A) Polychaete
B) Earthworm
C) Planarian
D) Leech
E) Flatworm
20. Which of the following statements is true about annelids?
A) All have a rigid exoskeleton
B) Most have jointed legs
C) They have a segmented body with a coelom
D) They lack a nervous system
E) They are acoelomates
- Questions on Cnidarians (Animal Kingdom)
- Questions on Flatworms (Phylum Platyhelminthes)
- Questions on Roundworms (Phylum Nematoda)
- Questions on Mollusks (Phylum Mollusca)
Answers and Explanations
1. B) Segmented body – Annelids are segmented worms.
2. B) Earthworm – Classic example of an annelid.
3. C) Coelomate – They have a true body cavity.
4. C) Metameres – The body segments are called metameres.
5. C) Setae – Bristle-like structures used for traction.
6. E) All of the above – Annelids have segmentation in multiple systems.
7. A) Nephridia – Used for excretion.
8. C) Hermaphroditic sexual reproduction – Earthworms have both sex organs.
9. C) Polychaeta – Marine annelids with parapodia.
10. D) Reproduction – Clitellum secretes mucus and is used in copulation.
11. C) Closed – Blood is contained in vessels.
12. C) Hirudinea – Leeches belong to this class.
13. A) Septa – Internal walls between segments.
14. D) A brain and ventral nerve cord – Standard annelid nervous layout.
15. C) Feeding – Parapodia are not directly used in feeding.
16. C) Bilateral – Like most higher animals.
17. D) Across the skin or parapodia – Through moist skin or structures like parapodia.
18. D) Anchoring and movement – Setae help grip surfaces.
19. D) Leech – Medicinal leeches are used for anticoagulants like hirudin.
20. C) They have a segmented body with a coelom – Core trait of annelids.
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