Questions about Echinoderms
Multiple-Choice Questions on Echinoderms (Animal Kingdom)
1. Echinoderms belong to which phylum?
A) Chordata
B) Arthropoda
C) Mollusca
D) Echinodermata
E) Annelida
2. Which of the following animals is an echinoderm?
A) Lobster
B) Starfish
C) Squid
D) Coral
E) Clam
3. What type of symmetry do adult echinoderms exhibit?
A) Bilateral
B) Asymmetrical
C) Radial (usually pentaradial)
D) Spiral
E) None
4. What kind of skeleton do echinoderms possess?
A) Cartilaginous
B) Bony
C) Chitinous
D) Hydrostatic
E) Calcareous endoskeleton
5. What is the primary function of the water vascular system in echinoderms?
A) Reproduction
B) Circulation
C) Locomotion and feeding
D) Digestion
E) Excretion
6. What is the name of the opening through which water enters the water vascular system?
A) Anus
B) Spiracle
C) Madreporite
D) Notochord
E) Nephridium
7. Which of these features is unique to echinoderms?
A) Jointed legs
B) Water vascular system
C) Antennae
D) Compound eyes
E) Gills
8. Which of the following animals is not an echinoderm?
A) Sea cucumber
B) Sea urchin
C) Brittle star
D) Sea anemone
E) Sand dollar
9. Echinoderms are found primarily in which environment?
A) Terrestrial
B) Freshwater
C) Brackish water
D) Marine
E) Polar ice
10. How do most echinoderms move?
A) Using jointed legs
B) By jet propulsion
C) Using tube feet
D) By flagella
E) By undulating body motion
11. What type of fertilization is most common in echinoderms?
A) Internal
B) Budding
C) Binary fission
D) External
E) Asexual fragmentation
12. Which echinoderm has a long, leathery body and moves with the help of tentacle-like tube feet?
A) Sea urchin
B) Starfish
C) Brittle star
D) Sea cucumber
E) Sand dollar
13. Which of the following echinoderms is globular and covered in spines?
A) Starfish
B) Sea anemone
C) Sea urchin
D) Sea cucumber
E) Brittle star
14. Which system is absent in echinoderms?
A) Digestive system
B) Nervous system
C) Circulatory system
D) Skeletal system
E) Respiratory system
15. Which echinoderm class includes brittle stars?
A) Asteroidea
B) Ophiuroidea
C) Echinoidea
D) Holothuroidea
E) Crinoidea
16. Which of these structures helps sea stars attach to surfaces and capture prey?
A) Antennae
B) Tentacles
C) Tube feet
D) Gills
E) Suckers
17. What happens when a starfish loses an arm?
A) It dies
B) It becomes paralyzed
C) The arm regrows
D) It sheds all other arms
E) It becomes infertile
18. How is the nervous system of echinoderms organized?
A) Brain and spinal cord
B) Nerve net and ring
C) Ladder-like nerves
D) Centralized brain only
E) Ganglia only
19. What is true about the symmetry of echinoderm larvae?
A) Radial
B) Pentaradial
C) Bilateral
D) Asymmetrical
E) Spherical
20. Echinoderms are closely related to which group of animals?
A) Arthropods
B) Mollusks
C) Chordates
D) Cnidarians
E) Nematodes
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Answers with Explanations
1. D) Echinodermata
Echinoderms belong to the phylum Echinodermata.
2. B) Starfish
Starfish (also called sea stars) are classic representatives of echinoderms.
3. C) Radial (usually pentaradial)
Adults show pentaradial symmetry, though larvae are bilaterally symmetrical.
4. E) Calcareous endoskeleton
Their skeleton is made of calcium carbonate plates beneath the skin.
5. C) Locomotion and feeding
The water vascular system powers tube feet for movement and food handling.
6. C) Madreporite
The madreporite is a sieve-like structure where water enters the system.
7. B) Water vascular system
This hydraulic system is unique to echinoderms.
8. D) Sea anemone
Sea anemones are cnidarians, not echinoderms.
9. D) Marine
Echinoderms are exclusively marine animals.
10. C) Using tube feet
They use hydraulic pressure in tube feet to move and grip surfaces.
11. D) External
Fertilization usually occurs outside the body in the surrounding water.
12. D) Sea cucumber
Sea cucumbers have elongated bodies and use tentacle-like feet.
13. C) Sea urchin
Sea urchins are round and spiny, often seen on rocky sea beds.
14. C) Circulatory system
They lack a true circulatory system and rely on the water vascular system.
15. B) Ophiuroidea
Brittle stars belong to the class Ophiuroidea.
16. C) Tube feet
Tube feet function in attachment, movement, and prey handling.
17. C) The arm regrows
Starfish have impressive regenerative abilities.
18. B) Nerve net and ring
They have a decentralized system with a nerve ring and radial nerves.
19. C) Bilateral
Larvae have bilateral symmetry, later changing to radial in adults.
20. C) Chordates
Echinoderms and chordates are both deuterostomes and share a common ancestor.
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