- Oligochaeta is a class within which phylum?
- A) Arthropoda
- B) Mollusca
- C) Annelida
- D) Nematoda
Answer: C) Annelida
- What is the primary habitat of most Oligochaetes?
- A) Marine environments
- B) Terrestrial soil and freshwater
- C) Aerial
- D) Desert
Answer: B) Terrestrial soil and freshwater
- Which of the following is a well-known member of the Oligochaeta class?
- A) Leeches
- B) Earthworms
- C) Polychaetes
- D) Sponges
Answer: B) Earthworms
- Oligochaetes are characterized by the presence of:
- A) Parapodia
- B) Setae
- C) Tentacles
- D) Exoskeleton
Answer: B) Setae
- The clitellum in Oligochaetes is primarily used for:
- A) Respiration
- B) Reproduction
- C) Locomotion
- D) Digestion
Answer: B) Reproduction
- The digestive system of Oligochaetes is:
- A) Incomplete
- B) Complete
- C) Simple
- D) Lacking
Answer: B) Complete
- Which structure in Oligochaetes is responsible for grinding food?
- A) Mouth
- B) Gizzard
- C) Pharynx
- D) Crop
Answer: B) Gizzard
- Oligochaetes primarily feed on:
- A) Algae
- B) Decaying organic matter
- C) Small fish
- D) Plankton
Answer: B) Decaying organic matter
- The excretory system of Oligochaetes mainly consists of:
- A) Malpighian tubules
- B) Nephridia
- C) Kidneys
- D) Gills
Answer: B) Nephridia
- Oligochaetes exhibit which type of symmetry?
- A) Radial
- B) Bilateral
- C) Asymmetrical
- D) None of the above
Answer: B) Bilateral
- The body of an Oligochaete is divided into segments called:
- A) Somites
- B) Segments
- C) Metameres
- D) None of the above
Answer: C) Metameres
- Oligochaetes reproduce primarily through:
- A) Asexual reproduction
- B) Binary fission
- C) Sexual reproduction
- D) Budding
Answer: C) Sexual reproduction
- The skin of Oligochaetes plays a crucial role in:
- A) Photosynthesis
- B) Gas exchange
- C) Excretion
- D) Digestion
Answer: B) Gas exchange
- Which of the following statements is true about Oligochaetes?
- A) They have a closed circulatory system.
- B) They have an open circulatory system.
- C) They lack a circulatory system.
- D) They have a primitive circulatory system.
Answer: A) They have a closed circulatory system.
- The movement of Oligochaetes is primarily achieved through:
- A) Jet propulsion
- B) Cilia
- C) Peristalsis
- D) Swimming
Answer: C) Peristalsis
- The main advantage of a segmented body plan in Oligochaetes is:
- A) Increased flexibility
- B) Greater size
- C) Enhanced reproductive capability
- D) Increased metabolic rate
Answer: A) Increased flexibility
- What type of larvae do Oligochaetes typically produce?
- A) Trochophore
- B) Nauplius
- C) Metanauplius
- D) None of the above
Answer: A) Trochophore
- Which of the following is NOT a characteristic of Oligochaetes?
- A) Presence of setae
- B) Well-developed eyes
- C) Segmented body
- D) Clitellum
Answer: B) Well-developed eyes
- Oligochaetes are important for soil health because they:
- A) Compete with plants for nutrients
- B) Aerate the soil and break down organic material
- C) Deplete soil moisture
- D) Poison the soil
Answer: B) Aerate the soil and break down organic material
- The circulatory fluid in Oligochaetes is known as:
- A) Hemolymph
- B) Blood
- C) Lymph
- D) Plasma
Answer: B) Blood
- Oligochaetes exhibit which form of locomotion?
- A) Crawling
- B) Burrowing
- C) Swimming
- D) Both A and B
Answer: D) Both A and B
- Which of the following is a reproductive structure found in Oligochaetes?
- A) Ovaries
- B) Testes
- C) Seminal vesicles
- D) All of the above
Answer: D) All of the above
- The presence of a clitellum is a key feature for which class of Annelida?
- A) Polychaeta
- B) Hirudinea
- C) Oligochaeta
- D) All of the above
Answer: C) Oligochaeta
- Which Oligochaete is commonly used as bait in fishing?
- A) Tubifex
- B) Nightcrawler
- C) Leeches
- D) Sandworm
Answer: B) Nightcrawler
- Oligochaetes are considered:
- A) Herbivores
- B) Carnivores
- C) Detritivores
- D) Omnivores
Answer: C) Detritivores
- The process by which Oligochaetes remove waste is called:
- A) Excretion
- B) Egestion
- C) Respiration
- D) Digestion
Answer: A) Excretion
- Which of the following Oligochaetes is known for living in aquatic environments?
- A) Lumbricus terrestris
- B) Eisenia fetida
- C) Tubifex tubifex
- D) Allolobophora chlorotica
Answer: C) Tubifex tubifex
- Oligochaetes can be identified by their:
- A) Bright colors
- B) Soft, segmented bodies
- C) Hard shells
- D) Jointed appendages
Answer: B) Soft, segmented bodies
- Which of the following is a function of the gizzard in Oligochaetes?
- A) Absorption
- B) Digestion
- C) Filtration
- D) Grinding food
Answer: D) Grinding food
- The ecological role of Oligochaetes in soil is primarily as:
- A) Predators
- B) Decomposers
- C) Herbivores
- D) Parasites
Answer: B) Decomposers