Questions on Flatworms (Phylum Platyhelminthes)
Flatworms (Phylum Platyhelminthes) – Multiple Choice Questions
1. Flatworms are considered to be:
A) Diploblastic and coelomate
B) Triploblastic and acoelomate
C) Diploblastic and pseudocoelomate
D) Triploblastic and coelomate
E) Acoelomate and unicellular
2. Which of the following best describes the symmetry of flatworms?
A) Asymmetrical
B) Spherical
C) Radial
D) Bilateral
E) None of the above
3. Flatworms belong to which phylum?
A) Nematoda
B) Mollusca
C) Annelida
D) Platyhelminthes
E) Arthropoda
4. Which of the following is not a class within the Platyhelminthes?
A) Turbellaria
B) Cestoda
C) Trematoda
D) Monogenea
E) Polychaeta
5. The excretory system of flatworms includes:
A) Kidneys
B) Malpighian tubules
C) Flame cells (protonephridia)
D) Nephridia
E) Chloragogen cells
6. What type of digestive system do flatworms have?
A) No digestive system
B) Incomplete digestive system
C) Complete digestive system
D) One with anus and mouth
E) Two-way digestive system
7. The flatworm planaria is known for its ability to:
A) Fly short distances
B) Regenerate lost body parts
C) Produce silk
D) Photosynthesize
E) Infect humans
8. The body cavity of flatworms is:
A) True coelom
B) Pseudocoelom
C) Absent (acoelomate)
D) Fluid-filled
E) Multicellular
9. Which of the following flatworm classes contains parasitic tapeworms?
A) Turbellaria
B) Trematoda
C) Cestoda
D) Monogenea
E) Annelida
10. Flatworms perform gas exchange through:
A) Gills
B) Lungs
C) Skin by diffusion
D) Tracheae
E) Spiracles
11. Which structure is used by flatworms to attach to a host?
A) Antennae
B) Suckers and hooks
C) Proboscis
D) Teeth
E) Mandibles
12. Flatworms show cephalization, meaning they have:
A) Limbs
B) Shells
C) A head region with sensory organs
D) Exoskeletons
E) Eyes with lenses
13. Tapeworms absorb nutrients through their:
A) Mouth
B) Tentacles
C) Intestine
D) Skin (body surface)
E) Siphon
14. Flatworms reproduce:
A) Only asexually
B) Only sexually
C) Sexually and asexually
D) Only by budding
E) By parthenogenesis
15. The scolex of a tapeworm is used for:
A) Digestion
B) Movement
C) Attachment
D) Reproduction
E) Feeding
16. Proglottids in tapeworms are:
A) Feeding organs
B) Excretory units
C) Reproductive segments
D) Nervous system clusters
E) Locomotor appendages
17. A common disease caused by flatworms in humans is:
A) Ringworm
B) Schistosomiasis
C) Malaria
D) Amoebiasis
E) Tetanus
18. Which flatworm class includes free-living species?
A) Cestoda
B) Trematoda
C) Turbellaria
D) Monogenea
E) Nematoda
19. Flatworms are mainly found in:
A) Deserts
B) Deep sea trenches only
C) Aquatic and moist terrestrial environments
D) Dry grasslands
E) Alpine regions
20. Flatworms lack which of the following systems?
A) Nervous system
B) Digestive system
C) Excretory system
D) Circulatory and respiratory systems
E) Reproductive system
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Answers with Explanations
1. B) Triploblastic and acoelomate – Flatworms have three germ layers and no body cavity.
2. D) Bilateral – Their bodies are symmetrical along one plane.
3. D) Platyhelminthes – This is the correct phylum for flatworms.
4. E) Polychaeta – A class of annelids, not flatworms.
5. C) Flame cells (protonephridia) – Used for excretion and osmoregulation.
6. B) Incomplete digestive system – One opening serves as both mouth and anus.
7. B) Regenerate lost body parts – Planarians can regrow parts like head and tail.
8. C) Absent (acoelomate) – They have no body cavity between the gut and body wall.
9. C) Cestoda – This class includes parasitic tapeworms.
10. C) Skin by diffusion – No specialized respiratory organs are present.
11. B) Suckers and hooks – Especially in parasitic species for host attachment.
12. C) A head region with sensory organs – A hallmark of cephalization.
13. D) Skin (body surface) – Tapeworms absorb nutrients directly across their surface.
14. C) Sexually and asexually – They can reproduce both ways depending on the species.
15. C) Attachment – The scolex has hooks/suckers to attach to host tissues.
16. C) Reproductive segments – Proglottids contain male and female reproductive organs.
17. B) Schistosomiasis – A disease caused by parasitic blood flukes.
18. C) Turbellaria – Mostly free-living flatworms like planarians.
19. C) Aquatic and moist terrestrial environments – Required for gas exchange and movement.
20. D) Circulatory and respiratory systems – These are absent in flatworms.
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