- Nematoda is commonly known as what type of organism?
- A) Flatworms
- B) Roundworms
- C) Segmented worms
- D) Cnidarians Answer: B) Roundworms
- What type of body symmetry do nematodes exhibit?
- A) Bilateral symmetry
- B) Radial symmetry
- C) Asymmetry
- D) None of the above Answer: A) Bilateral symmetry
- Nematodes have which type of body cavity?
- A) Acoelomate
- B) Pseudocoelomate
- C) Coelomate
- D) None of the above Answer: B) Pseudocoelomate
- Which of the following is a characteristic of nematodes?
- A) Segmented body
- B) Soft, unsegmented body
- C) Presence of a shell
- D) Possession of parapodia Answer: B) Soft, unsegmented body
- Nematodes possess a tough outer covering called:
- A) Chitin
- B) Cuticle
- C) Shell
- D) Tegument Answer: B) Cuticle
- Which of the following habitats do nematodes NOT typically inhabit?
- A) Soil
- B) Freshwater
- C) Marine environments
- D) Air Answer: D) Air
- The feeding mode of most nematodes is:
- A) Herbivorous
- B) Carnivorous
- C) Parasitic
- D) All of the above Answer: D) All of the above
- How do nematodes typically reproduce?
- A) Asexually
- B) Budding
- C) Sexually
- D) Fragmentation Answer: C) Sexually
- Which nematode is well-known for causing disease in humans?
- A) Ascaris lumbricoides
- B) Caenorhabditis elegans
- C) Trichinella spiralis
- D) Both A and C Answer: D) Both A and C
- Nematodes possess a complete digestive system that includes:
- A) Mouth and anus
- B) Stomach only
- C) Pharynx and gizzard
- D) No digestive tract Answer: A) Mouth and anus
- Which of the following is NOT a common feature of nematodes?
- A) Dorsal and ventral nerve cords
- B) Segmented body
- C) Cuticle
- D) Pseudocoelom Answer: B) Segmented body
- The muscle fibers in nematodes are organized:
- A) Circularly
- B) Longitudinally
- C) In a spiral
- D) In a grid pattern Answer: B) Longitudinally
- What is the primary role of nematodes in the ecosystem?
- A) Decomposers
- B) Predators
- C) Parasites
- D) All of the above Answer: D) All of the above
- Which of the following nematodes is commonly used as a model organism in scientific research?
- A) Trichinella spiralis
- B) Caenorhabditis elegans
- C) Ascaris lumbricoides
- D) Enterobius vermicularis Answer: B) Caenorhabditis elegans
- Nematodes can be found in which of the following environments?
- A) Aquatic
- B) Terrestrial
- C) Parasitic in other organisms
- D) All of the above Answer: D) All of the above
- The main reproductive structures in nematodes are called:
- A) Testes and ovaries
- B) Cloaca
- C) Nephridia
- D) Setae Answer: A) Testes and ovaries
- Which of the following nematodes is responsible for pinworm infections in humans?
- A) Ascaris lumbricoides
- B) Enterobius vermicularis
- C) Trichinella spiralis
- D) Wuchereria bancrofti Answer: B) Enterobius vermicularis
- What is the approximate length range for most nematodes?
- A) Microscopic to a few centimeters
- B) A few millimeters to several meters
- C) One to ten centimeters
- D) Ten to twenty centimeters Answer: A) Microscopic to a few centimeters
- Nematodes are characterized by having:
- A) A segmented body plan
- B) A coelomic cavity
- C) A non-segmented body plan
- D) A dorsal nerve cord Answer: C) A non-segmented body plan
- The term “eutely” refers to:
- A) The presence of segments in the body
- B) Having a constant number of somatic cells
- C) The ability to regenerate lost body parts
- D) The presence of a true coelom Answer: B) Having a constant number of somatic cells
- What is a common method of nematode locomotion?
- A) Swimming
- B) Gliding
- C) Undulatory movements
- D) Burrowing Answer: C) Undulatory movements
- Which nematode is known for its role in causing river blindness?
- A) Wuchereria bancrofti
- B) Onchocerca volvulus
- C) Ascaris lumbricoides
- D) Strongyloides stercoralis Answer: B) Onchocerca volvulus
- Which part of the nematode’s body is specialized for sensory perception?
- A) Pharynx
- B) Amphids
- C) Cuticle
- D) Cloaca Answer: B) Amphids
- Nematodes can be found in extreme environments, including:
- A) Deep sea vents
- B) Arctic ice
- C) Hot springs
- D) All of the above Answer: D) All of the above
- Which of the following is a parasitic nematode that infects muscle tissue?
- A) Wuchereria bancrofti
- B) Trichinella spiralis
- C) Caenorhabditis elegans
- D) Enterobius vermicularis Answer: B) Trichinella spiralis
- Nematodes contribute to soil health primarily through:
- A) Nutrient cycling
- B) Organic matter decomposition
- C) Pest control
- D) All of the above Answer: D) All of the above
- Which of the following structures do nematodes lack?
- A) Digestive tract
- B) Heart
- C) Nervous system
- D) Body wall Answer: B) Heart
- The cuticle of nematodes is primarily composed of:
- A) Collagen
- B) Chitin
- C) Keratin
- D) Protein Answer: A) Collagen
- Which life cycle stage is absent in many free-living nematodes?
- A) Egg
- B) Larva
- C) Adult
- D) Pupa Answer: D) Pupa
- The primary ecological role of nematodes in marine ecosystems is as:
- A) Primary producers
- B) Decomposers and nutrient recyclers
- C) Predators of larger organisms
- D) Symbionts Answer: B) Decomposers and nutrient recyclers