- Rotifers are primarily found in which type of habitat?
- A) Marine
- B) Freshwater
- C) Terrestrial
- D) All of the above
Answer: D) All of the above
- The body of a typical rotifer is divided into how many main regions?
- A) One
- B) Two
- C) Three
- D) Four
Answer: C) Three
- What structure do rotifers use for locomotion and feeding?
- A) Tentacles
- B) Cilia
- C) Flagella
- D) Pseudopodia
Answer: B) Cilia
- The distinctive crown of cilia in rotifers is known as:
- A) Corona
- B) Tentacle
- C) Mantle
- D) Apical tuft
Answer: A) Corona
- Rotifers are classified under which phylum?
- A) Annelida
- B) Arthropoda
- C) Rotifera
- D) Mollusca
Answer: C) Rotifera
- Which of the following is NOT a characteristic of rotifers?
- A) Presence of a true coelom
- B) Small body size
- C) Complex organ systems
- D) A corona of cilia
Answer: A) Presence of a true coelom
- Most rotifers reproduce by:
- A) Asexual reproduction
- B) Sexual reproduction
- C) Budding
- D) Fission
Answer: A) Asexual reproduction
- The outer layer of rotifers is covered by a tough protective covering called:
- A) Cuticle
- B) Exoskeleton
- C) Shell
- D) Epidermis
Answer: A) Cuticle
- Rotifers primarily feed on:
- A) Detritus
- B) Microalgae and bacteria
- C) Larger invertebrates
- D) Plant material
Answer: B) Microalgae and bacteria
- The lifespan of most rotifers is typically:
- A) A few days
- B) Several weeks
- C) A few months
- D) Several years
Answer: B) Several weeks
- Which reproductive method allows rotifers to produce resting eggs that can survive adverse conditions?
- A) Parthenogenesis
- B) Sexual reproduction
- C) Asexual reproduction
- D) Budding
Answer: A) Parthenogenesis
- In terms of size, rotifers are generally:
- A) Microscopic
- B) Small (1-3 mm)
- C) Medium (3-10 cm)
- D) Large (over 10 cm)
Answer: B) Small (1-3 mm)
- The cilia on the corona of a rotifer serve which purpose?
- A) Locomotion
- B) Feeding
- C) Respiration
- D) Both A and B
Answer: D) Both A and B
- The excretory system in rotifers is primarily composed of:
- A) Flame cells
- B) Nephridia
- C) Kidneys
- D) Malpighian tubules
Answer: A) Flame cells
- Rotifers are part of which larger ecological group?
- A) Zooplankton
- B) Phytoplankton
- C) Benthos
- D) Nekton
Answer: A) Zooplankton
- The study of rotifers contributes to our understanding of:
- A) Aquatic ecosystems
- B) Evolutionary biology
- C) Freshwater ecology
- D) All of the above
Answer: D) All of the above
- Which of the following statements is TRUE about rotifers?
- A) They have a segmented body.
- B) They can regenerate lost parts.
- C) They possess a true coelom.
- D) They are exclusively marine.
Answer: B) They can regenerate lost parts.
- The rotifer’s muscular pharynx, called a mastax, is used for:
- A) Locomotion
- B) Grinding food
- C) Respiration
- D) Excretion
Answer: B) Grinding food
- Rotifers can exhibit both sexual and asexual reproduction depending on environmental conditions. This is known as:
- A) Environmental plasticity
- B) Phenotypic plasticity
- C) Reproductive plasticity
- D) Developmental plasticity
Answer: C) Reproductive plasticity
- Which class of rotifers is known for its wheel-like corona?
- A) Monogononta
- B) Seisonidea
- C) Bdelloidea
- D) Acanthocephala
Answer: A) Monogononta
- What type of symmetry do rotifers exhibit?
- A) Radial symmetry
- B) Bilateral symmetry
- C) Asymmetry
- D) None of the above
Answer: B) Bilateral symmetry
- The reproductive strategy of rotifers that produces only females is known as:
- A) Parthenogenesis
- B) Hermaphroditism
- C) Dioecy
- D) Asexual reproduction
Answer: A) Parthenogenesis
- The ecological role of rotifers includes:
- A) Primary producers
- B) Decomposers
- C) Predators of bacteria and algae
- D) All of the above
Answer: C) Predators of bacteria and algae
- Which of the following statements about rotifers is FALSE?
- A) They are multicellular organisms.
- B) They have a closed circulatory system.
- C) They possess a nervous system.
- D) They are often found in temporary ponds.
Answer: B) They have a closed circulatory system.
- Rotifers can survive in extreme environments through a process called:
- A) Cryptobiosis
- B) Dormancy
- C) Hibernation
- D) Estivation
Answer: A) Cryptobiosis
- The unique feature of rotifers that allows them to withstand desiccation is called:
- A) Encystment
- B) Polymorphism
- C) Bioluminescence
- D) Cryptobiosis
Answer: D) Cryptobiosis
- Which of the following is an example of a rotifer species?
- A) Asplanchna
- B) Daphnia
- C) Cyclops
- D) Planaria
Answer: A) Asplanchna
- The primary mode of nutrition for rotifers is:
- A) Photosynthesis
- B) Filter feeding
- C) Absorbing nutrients through the skin
- D) Chemosynthesis
Answer: B) Filter feeding
- Rotifers are an important part of which food web?
- A) Marine food web
- B) Freshwater food web
- C) Terrestrial food web
- D) All of the above
Answer: B) Freshwater food web
- Rotifers possess a simple nervous system characterized by:
- A) A centralized brain
- B) A nerve ring and longitudinal cords
- C) Ganglia only
- D) No nervous system
Answer: B) A nerve ring and longitudinal cords