- Which of the following is a characteristic feature of Rhabditia nematodes?
- A) Segmented body
- B) Well-developed pharynx
- C) Lack of a cuticle
- D) Absence of amphids
Answer: B) Well-developed pharynx
- Rhabditia nematodes are primarily found in which type of environment?
- A) Aquatic
- B) Terrestrial
- C) Both A and B
- D) Airborne
Answer: C) Both A and B
- Which of the following genera is commonly associated with Rhabditia nematodes?
- A) Ascaris
- B) Caenorhabditis
- C) Heterodera
- D) Meloidogyne
Answer: B) Caenorhabditis
- Which species is the model organism often used in genetic studies among Rhabditia?
- A) Caenorhabditis elegans
- B) Rhabditis sp.
- C) Pristionchus pacificus
- D) Steinernema carpocapsae
Answer: A) Caenorhabditis elegans
- What is the main feeding strategy of Rhabditia nematodes?
- A) Predatory
- B) Parasitic
- C) Saprophytic
- D) Herbivorous
Answer: C) Saprophytic
- The reproductive strategy of Rhabditia nematodes generally involves:
- A) Asexual reproduction
- B) Sexual reproduction
- C) Parthenogenesis
- D) Budding
Answer: B) Sexual reproduction
- Which of the following is NOT a common habitat for Rhabditia nematodes?
- A) Soil
- B) Freshwater
- C) Marine environments
- D) Ice
Answer: D) Ice
- The body shape of Rhabditia nematodes is typically:
- A) Flattened
- B) Cylindrical
- C) Irregular
- D) Discoidal
Answer: B) Cylindrical
- The amphids of Rhabditia nematodes are primarily used for:
- A) Locomotion
- B) Feeding
- C) Sensory functions
- D) Excretion
Answer: C) Sensory functions
- Which of the following nematodes belongs to the Rhabditia order?
- A) Trichinella spiralis
- B) Strongyloides stercoralis
- C) Ancylostoma duodenale
- D) Wuchereria bancrofti
Answer: B) Strongyloides stercoralis
- The cuticle of Rhabditia nematodes is primarily composed of:
- A) Chitin
- B) Cellulose
- C) Collagen
- D) Keratin
Answer: A) Chitin
- Which structure in Rhabditia nematodes is primarily responsible for feeding?
- A) Mouth
- B) Pharynx
- C) Esophagus
- D) Cloaca
Answer: B) Pharynx
- Rhabditia nematodes are important in soil ecosystems because they:
- A) Decompose organic matter
- B) Prey on insects
- C) Form symbiotic relationships with plants
- D) Produce oxygen
Answer: A) Decompose organic matter
- Which of the following is a significant research application of Rhabditia nematodes?
- A) Medical studies on human parasites
- B) Development of pest control methods
- C) Studies on genetics and development
- D) Assessment of environmental health
Answer: C) Studies on genetics and development
- The larvae of Rhabditia nematodes develop primarily through which process?
- A) Direct development
- B) Indirect development
- C) Fragmentation
- D) Parthenogenesis
Answer: A) Direct development
- Rhabditia nematodes can be utilized in biological control primarily against which type of pests?
- A) Bacteria
- B) Weeds
- C) Insects
- D) Fungi
Answer: C) Insects
- Which of the following statements about Rhabditia nematodes is true?
- A) They are all parasitic.
- B) They have a simple body plan.
- C) They can be found in extreme environments only.
- D) They lack a pharynx.
Answer: B) They have a simple body plan.
- The primary mode of locomotion in Rhabditia nematodes is:
- A) Ciliary movement
- B) Swimming
- C) Writhing movements
- D) Jet propulsion
Answer: C) Writhing movements
- Which of the following best describes the life cycle of Rhabditia nematodes?
- A) Complex, with multiple hosts
- B) Simple, with a single host
- C) Direct, with a single host
- D) Indirect, involving multiple hosts
Answer: C) Direct, with a single host
- Which of the following nematodes is commonly used as a model organism in laboratory studies?
- A) Rhabditis
- B) Caenorhabditis elegans
- C) Strongyloides
- D) Heterodera
Answer: B) Caenorhabditis elegans
- The typical diet of Rhabditia nematodes consists of:
- A) Fungi and bacteria
- B) Plant roots
- C) Animal tissues
- D) Algae
Answer: A) Fungi and bacteria
- Rhabditia nematodes are often studied in ecology due to their role in:
- A) Nitrogen cycling
- B) Phosphorus absorption
- C) Carbon fixation
- D) Oxygen production
Answer: A) Nitrogen cycling
- The eggs of Rhabditia nematodes are typically:
- A) Laid in water
- B) Laid in soil
- C) Retained within the female
- D) Distributed through air
Answer: B) Laid in soil
- Which of the following is a common method for isolating Rhabditia nematodes from soil samples?
- A) Filtration
- B) Centrifugation
- C) Baermann funnel technique
- D) Boiling
Answer: C) Baermann funnel technique
- Rhabditia nematodes are primarily studied for their role in:
- A) Human diseases
- B) Animal diseases
- C) Soil health
- D) Water quality
Answer: C) Soil health
- Which of the following structures in Rhabditia nematodes is involved in reproduction?
- A) Oviduct
- B) Cloaca
- C) Pharynx
- D) Excretory canal
Answer: A) Oviduct
- The amphids in Rhabditia nematodes serve as:
- A) Organs for locomotion
- B) Sensory structures
- C) Reproductive organs
- D) Digestive glands
Answer: B) Sensory structures
- Which of the following is a significant ecological role of Rhabditia nematodes?
- A) Pollination
- B) Decomposition
- C) Nitrogen fixation
- D) Carbon sequestration
Answer: B) Decomposition
- The mouth of Rhabditia nematodes typically contains:
- A) A stylet
- B) A proboscis
- C) Tentacles
- D) Teeth
Answer: A) A stylet
- Which of the following methods is used for the study of Rhabditia nematodes in genetics?
- A) Gene knockout techniques
- B) Microscopy
- C) Electrophoresis
- D) PCR amplification
Answer: A) Gene knockout techniques