- Merostomata is commonly known as:
- A) Crabs
- B) Horseshoe crabs
- C) Spiders
- D) Shrimp
Answer: B) Horseshoe crabs
- What type of body structure do horseshoe crabs possess?
- A) Soft-bodied
- B) Segmented
- C) Hard exoskeleton
- D) Jelly-like
Answer: C) Hard exoskeleton
- Horseshoe crabs primarily belong to which class?
- A) Crustacea
- B) Arachnida
- C) Merostomata
- D) Insecta
Answer: C) Merostomata
- The primary habitat of horseshoe crabs is:
- A) Freshwater lakes
- B) Terrestrial environments
- C) Coastal marine waters
- D) High mountains
Answer: C) Coastal marine waters
- Horseshoe crabs have how many pairs of legs?
- A) 4
- B) 5
- C) 10
- D) 6
Answer: A) 4
- Which of the following structures is unique to horseshoe crabs?
- A) Chelipeds
- B) Telson
- C) Gills
- D) Antennae
Answer: B) Telson
- What is the main diet of horseshoe crabs?
- A) Herbivorous
- B) Carnivorous
- C) Detritivorous
- D) Omnivorous
Answer: D) Omnivorous
- Horseshoe crabs are most closely related to which of the following groups?
- A) Insects
- B) Arachnids
- C) Mollusks
- D) Crustaceans
Answer: B) Arachnids
- The blood of horseshoe crabs is notable for its high content of:
- A) Hemoglobin
- B) Hemocyanin
- C) Chlorophyll
- D) Collagen
Answer: B) Hemocyanin
- Which of the following is TRUE about the reproductive habits of horseshoe crabs?
- A) They are ovoviviparous
- B) They lay eggs in the sand
- C) They reproduce asexually
- D) They give live birth
Answer: B) They lay eggs in the sand
- The larval stage of horseshoe crabs is called:
- A) Nauplius
- B) Zoea
- C) Trinomial
- D) Trilobite
Answer: A) Nauplius
- Horseshoe crabs are most active during which time of day?
- A) Morning
- B) Afternoon
- C) Night
- D) They are diurnal
Answer: C) Night
- Which of the following is NOT a feature of horseshoe crabs?
- A) Compound eyes
- B) Fangs
- C) Chelicerae
- D) Segmented body
Answer: B) Fangs
- The primary function of the horseshoe crab’s telson is:
- A) Locomotion
- B) Defense
- C) Digestion
- D) Navigation
Answer: B) Defense
- Which of the following best describes the respiratory system of horseshoe crabs?
- A) Gills
- B) Lungs
- C) Book gills
- D) Spiracles
Answer: C) Book gills
- What role do horseshoe crabs play in the marine ecosystem?
- A) Predators
- B) Prey for other animals
- C) Decomposers
- D) Pollinators
Answer: B) Prey for other animals
- Horseshoe crabs are known for their long history, dating back to:
- A) The Jurassic period
- B) The Cambrian period
- C) The Ordovician period
- D) The Triassic period
Answer: B) The Cambrian period
- Which class does the horseshoe crab belong to?
- A) Myriapoda
- B) Insecta
- C) Merostomata
- D) Crustacea
Answer: C) Merostomata
- The primary function of the horseshoe crab’s exoskeleton is to:
- A) Facilitate movement
- B) Protect internal organs
- C) Aid in respiration
- D) Provide buoyancy
Answer: B) Protect internal organs
- Horseshoe crabs can often be found in what kind of waters?
- A) Deep oceanic
- B) Shallow coastal waters
- C) Freshwater rivers
- D) High-altitude lakes
Answer: B) Shallow coastal waters
- Which of the following adaptations helps horseshoe crabs to move through sediment?
- A) Strong legs
- B) Flat body shape
- C) Long telson
- D) Flexible exoskeleton
Answer: B) Flat body shape
- Which of the following is a characteristic of horseshoe crab reproduction?
- A) External fertilization
- B) Internal fertilization
- C) Asexual reproduction
- D) Parasitism
Answer: A) External fertilization
- Horseshoe crabs primarily use their pedipalps for:
- A) Swimming
- B) Grasping food
- C) Defense
- D) Walking
Answer: B) Grasping food
- What is the scientific significance of horseshoe crab blood?
- A) It is used for scientific research
- B) It contains a substance that detects bacterial contamination
- C) It is used in vaccines
- D) All of the above
Answer: D) All of the above
- Which of the following is a threat to horseshoe crab populations?
- A) Habitat loss
- B) Overfishing
- C) Pollution
- D) All of the above
Answer: D) All of the above
- What type of symmetry do horseshoe crabs exhibit?
- A) Bilateral symmetry
- B) Radial symmetry
- C) Asymmetry
- D) None of the above
Answer: A) Bilateral symmetry
- Which structure helps horseshoe crabs to sense their environment?
- A) Antennae
- B) Simple eyes
- C) Compound eyes
- D) Spiracles
Answer: C) Compound eyes
- Horseshoe crabs are known for their ability to:
- A) Regenerate lost limbs
- B) Change color
- C) Produce silk
- D) Swim rapidly
Answer: A) Regenerate lost limbs
- What is the primary purpose of the horseshoe crab’s carapace?
- A) Aid in swimming
- B) Protect the body
- C) Help with digestion
- D) Facilitate respiration
Answer: B) Protect the body
- Horseshoe crabs are often used in:
- A) Medical research
- B) Agriculture
- C) Aquaculture
- D) All of the above
Answer: A) Medical research