- Cyclorhagida belongs to which phylum?
- A) Nematoda
- B) Arthropoda
- C) Kinorhyncha
- D) Annelida
Answer: C) Kinorhyncha
- What is the primary habitat of Cyclorhagida?
- A) Freshwater
- B) Marine sediments
- C) Terrestrial soils
- D) Airborne
Answer: B) Marine sediments
- What type of body segmentation is found in Cyclorhagida?
- A) Unsegmented
- B) 11 segments
- C) 5 segments
- D) 20 segments
Answer: B) 11 segments
- Which of the following is a characteristic feature of Cyclorhagida?
- A) Tentacles
- B) Cilia
- C) Spiny cuticle
- D) Jointed legs
Answer: C) Spiny cuticle
- Cyclorhagida are primarily found in what kind of environment?
- A) Rocky intertidal zones
- B) Deep sea
- C) Coastal mud
- D) Desert sands
Answer: C) Coastal mud
- What is the main feeding habit of Cyclorhagida?
- A) Herbivorous
- B) Detritivorous
- C) Carnivorous
- D) Parasitic
Answer: B) Detritivorous
- How do Cyclorhagida move?
- A) Ciliary movement
- B) Jet propulsion
- C) Crawling with retractable head
- D) Flagellar swimming
Answer: C) Crawling with retractable head
- What kind of exoskeleton do Cyclorhagida organisms have?
- A) Chitinous
- B) Collagenous
- C) Calcium carbonate
- D) Siliceous
Answer: B) Collagenous
- What sensory structures are present in Cyclorhagida?
- A) Eyes
- B) Scalids
- C) Antennae
- D) Statocysts
Answer: B) Scalids
- Which structure in Cyclorhagida helps in locomotion and environmental sensing?
- A) Tentacles
- B) Proboscis
- C) Scalids
- D) Fins
Answer: C) Scalids
- Cyclorhagida are members of which order?
- A) Allomalorhagida
- B) Cyclorhagida
- C) Scalida
- D) Chaetognatha
Answer: B) Cyclorhagida
- How do Cyclorhagida burrow into marine sediments?
- A) By using their tail
- B) Through retractable head spines
- C) By digging with fins
- D) By pushing with their body segments
Answer: B) Through retractable head spines
- What type of reproduction is common in Cyclorhagida?
- A) Asexual reproduction
- B) Budding
- C) Sexual reproduction
- D) Fragmentation
Answer: C) Sexual reproduction
- Which of the following is absent in Cyclorhagida?
- A) Nervous system
- B) Circulatory system
- C) Digestive system
- D) Excretory system
Answer: B) Circulatory system
- How do Cyclorhagida obtain oxygen?
- A) Through gills
- B) Diffusion through the body wall
- C) Through trachea
- D) Via lungs
Answer: B) Diffusion through the body wall
- Which layer of cells forms the outer covering of Cyclorhagida?
- A) Endoderm
- B) Mesoderm
- C) Ectoderm
- D) Exoskeleton
Answer: C) Ectoderm
- Cyclorhagida lack which of the following systems?
- A) Respiratory system
- B) Digestive system
- C) Excretory system
- D) Nervous system
Answer: A) Respiratory system
- What is the mode of excretion in Cyclorhagida?
- A) Nephridia
- B) Malpighian tubules
- C) Diffusion through body wall
- D) Kidneys
Answer: C) Diffusion through body wall
- Cyclorhagida are primarily:
- A) Primary consumers
- B) Secondary consumers
- C) Decomposers
- D) Producers
Answer: C) Decomposers
- What structure allows Cyclorhagida to retract their head?
- A) Proboscis
- B) Pharynx
- C) Scalids
- D) Collar
Answer: C) Scalids
- Which system in Cyclorhagida is responsible for sensing its surroundings?
- A) Digestive system
- B) Nervous system
- C) Respiratory system
- D) Muscular system
Answer: B) Nervous system
- Cyclorhagida species are typically found at which depth of the ocean?
- A) Shallow coastal waters
- B) Deep-sea trenches
- C) Surface waters
- D) Coral reefs
Answer: A) Shallow coastal waters
- How many body rings do Cyclorhagida organisms typically have?
- A) 5
- B) 10
- C) 11
- D) 15
Answer: C) 11
- Which part of the Cyclorhagida anatomy helps in anchoring the organism to the sediment?
- A) Tail spines
- B) Proboscis
- C) Head with spines
- D) Tentacles
Answer: C) Head with spines
- Cyclorhagida are known for having what kind of digestive system?
- A) Complete digestive system
- B) Incomplete digestive system
- C) Absorption only
- D) No digestive system
Answer: A) Complete digestive system
- Which structure in Cyclorhagida plays a role in environmental detection?
- A) Tentacles
- B) Cilia
- C) Eyespots
- D) Sensory scalids
Answer: D) Sensory scalids
- Cyclorhagida organisms contribute to the ecosystem as:
- A) Pollinators
- B) Detritivores
- C) Parasites
- D) Photosynthesizers
Answer: B) Detritivores
- What distinguishes Cyclorhagida from other Kinorhyncha groups?
- A) Presence of antennae
- B) Lack of segmentation
- C) Scalids surrounding the mouth
- D) Body made of chitin
Answer: C) Scalids surrounding the mouth
- Cyclorhagida play a critical role in the breakdown of which material?
- A) Wood
- B) Detritus and organic matter
- C) Marine plants
- D) Coral skeletons
Answer: B) Detritus and organic matter
- Cyclorhagida species exhibit which type of development?
- A) Indirect development with larvae
- B) Direct development
- C) Asexual reproduction
- D) Regeneration of body parts
Answer: B) Direct development