- What is the primary characteristic of Acanthocephala?
- A) Segmented body
- B) Acoelomate body
- C) Presence of spiny proboscis
- D) Chitinous exoskeleton Answer: C) Presence of spiny proboscis
- Acanthocephalans are commonly known as:
- A) Flatworms
- B) Thorny-headed worms
- C) Roundworms
- D) Segmented worms Answer: B) Thorny-headed worms
- The adult Acanthocephalans typically reside in which organ of their definitive hosts?
- A) Liver
- B) Intestine
- C) Heart
- D) Lungs Answer: B) Intestine
- What type of life cycle do Acanthocephalans have?
- A) Direct life cycle
- B) Indirect life cycle
- C) Complex life cycle
- D) Simple life cycle Answer: B) Indirect life cycle
- Which of the following is a common intermediate host for Acanthocephalans?
- A) Mammals
- B) Insects
- C) Crustaceans
- D) Fish Answer: C) Crustaceans
- The body of an Acanthocephalan is divided into which two main parts?
- A) Scolex and strobila
- B) Head and abdomen
- C) Proboscis and trunk
- D) Neck and tail Answer: C) Proboscis and trunk
- Which of the following structures is absent in Acanthocephalans?
- A) Digestive system
- B) Circulatory system
- C) Nervous system
- D) Excretory system Answer: A) Digestive system
- The proboscis of Acanthocephalans is primarily used for:
- A) Locomotion
- B) Attachment to the host
- C) Feeding
- D) Reproduction Answer: B) Attachment to the host
- Acanthocephalans are known to have a body covered by:
- A) Cuticle
- B) Scales
- C) Shell
- D) Chitin Answer: A) Cuticle
- What is the primary means of reproduction for Acanthocephalans?
- A) Asexual budding
- B) Binary fission
- C) Sexual reproduction
- D) Fragmentation Answer: C) Sexual reproduction
- Which of the following hosts is typically considered the definitive host for Acanthocephalans?
- A) Birds
- B) Fish
- C) Mammals
- D) Reptiles Answer: C) Mammals
- The larval form of Acanthocephalans is known as:
- A) Cystacanth
- B) Oncosphere
- C) Metacestode
- D) Trochophore Answer: B) Oncosphere
- Acanthocephalans are primarily:
- A) Herbivores
- B) Carnivores
- C) Parasitic
- D) Saprophytic Answer: C) Parasitic
- The Acanthocephala phylum is classified under which larger group of organisms?
- A) Annelida
- B) Nematoda
- C) Platyhelminthes
- D) Ecdysozoa Answer: D) Ecdysozoa
- In terms of habitat, Acanthocephalans are predominantly found in:
- A) Freshwater
- B) Terrestrial
- C) Marine
- D) Both freshwater and marine Answer: D) Both freshwater and marine
- The reproductive organs of Acanthocephalans are typically located in:
- A) Proboscis
- B) Trunk
- C) Neck
- D) Tail Answer: B) Trunk
- What is the function of the spines on the proboscis of Acanthocephalans?
- A) To aid in locomotion
- B) To penetrate the host tissue
- C) To assist in digestion
- D) To capture prey Answer: B) To penetrate the host tissue
- Which of the following is a notable disease caused by Acanthocephalans in fish?
- A) Ichthyophthiriasis
- B) Acanthocephaliasis
- C) Whirling disease
- D) Saprolegniasis Answer: B) Acanthocephaliasis
- How do Acanthocephalans obtain nutrients?
- A) Absorption through their cuticle
- B) Through a digestive system
- C) Phagocytosis
- D) Photosynthesis Answer: A) Absorption through their cuticle
- Which of the following best describes the eggs of Acanthocephalans?
- A) Large and colorful
- B) Small and non-viable
- C) Thick-shelled and often larvated
- D) Transparent and fragile Answer: C) Thick-shelled and often larvated
- The typical size range of adult Acanthocephalans is:
- A) 1-2 mm
- B) 5-20 cm
- C) 1-5 m
- D) 2-10 cm Answer: B) 5-20 cm
- Which of the following is NOT a method of transmission for Acanthocephalans?
- A) Direct ingestion of eggs
- B) Ingestion of infected intermediate hosts
- C) Skin penetration
- D) Contaminated water Answer: C) Skin penetration
- Acanthocephalans primarily affect which of the following animal groups?
- A) Birds and reptiles
- B) Mammals and birds
- C) Fish and mammals
- D) Amphibians and insects Answer: C) Fish and mammals
- The presence of a proboscis allows Acanthocephalans to:
- A) Swim effectively
- B) Attach firmly to the intestinal wall
- C) Absorb nutrients directly
- D) Reproduce efficiently Answer: B) Attach firmly to the intestinal wall
- Which of the following life stages is capable of infecting the definitive host?
- A) Oncosphere
- B) Cystacanth
- C) Adult
- D) Larval Answer: C) Adult
- Which scientific term describes the process of Acanthocephalans attaching to their host?
- A) Adhesion
- B) Penetration
- C) Attachment
- D) Invasion Answer: C) Attachment
- The spines of the proboscis are composed of:
- A) Collagen
- B) Chitin
- C) Keratin
- D) Sclerotized material Answer: D) Sclerotized material
- Acanthocephalans are known for their ability to manipulate the behavior of their hosts. This phenomenon is referred to as:
- A) Behavioral manipulation
- B) Host manipulation
- C) Parasitic influence
- D) Biotic control Answer: B) Host manipulation
- What is the role of the acanthor in the life cycle of Acanthocephalans?
- A) It is the larval stage that infects the intermediate host.
- B) It is the reproductive stage in the definitive host.
- C) It helps in the absorption of nutrients.
- D) It is a dormant stage in unfavorable conditions. Answer: A) It is the larval stage that infects the intermediate host.
- In ecological terms, Acanthocephalans are considered:
- A) Primary producers
- B) Secondary consumers
- C) Parasitic organisms
- D) Decomposers Answer: C) Parasitic organisms