- Inarticulata is a class within which phylum?
- A) Mollusca
- B) Arthropoda
- C) Brachiopoda
- D) Echinodermata
Answer: C) Brachiopoda
- What distinguishes Inarticulata from other brachiopods?
- A) Presence of a hinge
- B) Lack of a hinge
- C) Possession of a shell
- D) Complex nervous system
Answer: B) Lack of a hinge
- Which of the following is a characteristic feature of Inarticulata?
- A) Two shells held together by teeth
- B) Simple, unhinged shells
- C) Spiraled shell shape
- D) Presence of tentacles
Answer: B) Simple, unhinged shells
- Inarticulata primarily inhabit which type of environment?
- A) Terrestrial
- B) Freshwater
- C) Marine
- D) All of the above
Answer: C) Marine
- The feeding mechanism of Inarticulata is mainly:
- A) Suspension feeding
- B) Predation
- C) Herbivory
- D) Parasitism
Answer: A) Suspension feeding
- Inarticulata shells are typically made of:
- A) Calcium carbonate
- B) Organic material
- C) Silica
- D) Chitin
Answer: A) Calcium carbonate
- Which of the following is a common genus within the Inarticulata class?
- A) Lingula
- B) Terebratalia
- C) Discinisca
- D) Rhynchonella
Answer: A) Lingula
- Inarticulata are primarily known for their:
- A) Ability to swim
- B) Fossil record
- C) Bright coloration
- D) High mobility
Answer: B) Fossil record
- Which structure do Inarticulata use for feeding?
- A) Radula
- B) Lophophore
- C) Gills
- D) Mandibles
Answer: B) Lophophore
- What is the main function of the lophophore in Inarticulata?
- A) Locomotion
- B) Reproduction
- C) Gas exchange
- D) Feeding
Answer: D) Feeding
- Which of the following statements about Inarticulata is TRUE?
- A) They have a well-developed foot.
- B) They are mostly solitary organisms.
- C) They are capable of active swimming.
- D) They lack a circulatory system.
Answer: B) They are mostly solitary organisms.
- Inarticulata are often found buried in:
- A) Sand
- B) Mud
- C) Gravel
- D) All of the above
Answer: D) All of the above
- The reproduction in Inarticulata is primarily:
- A) Asexual
- B) Sexual
- C) Budding
- D) Fragmentation
Answer: B) Sexual
- The external shell of Inarticulata can be described as:
- A) Thick and heavy
- B) Thin and flexible
- C) Calcareous and smooth
- D) Organic and leathery
Answer: C) Calcareous and smooth
- Inarticulata belong to which major group of marine animals?
- A) Mollusks
- B) Echinoderms
- C) Lophophorates
- D) Cnidarians
Answer: C) Lophophorates
- Which feature is NOT characteristic of Inarticulata?
- A) Presence of a hinge
- B) Soft body structure
- C) Filter-feeding mechanism
- D) Lack of complex eyes
Answer: A) Presence of a hinge
- The Inarticulata class is believed to have originated in which geological period?
- A) Cambrian
- B) Ordovician
- C) Silurian
- D) Devonian
Answer: A) Cambrian
- Lingula, a well-known genus of Inarticulata, is often referred to as:
- A) The living fossil
- B) The marine worm
- C) The bivalve
- D) The sea cucumber
Answer: A) The living fossil
- Inarticulata are primarily characterized by having:
- A) A calcified shell with intricate designs
- B) A simple unhinged shell with no distinct structure
- C) A hardened body with jointed appendages
- D) A segmented body with multiple limbs
Answer: B) A simple unhinged shell with no distinct structure
- The larval form of Inarticulata is called:
- A) Trochophore
- B) Nauplius
- C) Veliger
- D) Metanauplius
Answer: A) Trochophore
- Which of the following is a unique adaptation of Inarticulata?
- A) Ability to regenerate lost body parts
- B) Ability to thrive in extreme environments
- C) Ability to withstand low oxygen levels
- D) Ability to produce bioluminescence
Answer: C) Ability to withstand low oxygen levels
- Inarticulata primarily feed on:
- A) Small fish
- B) Organic detritus and plankton
- C) Microalgae
- D) Other brachiopods
Answer: B) Organic detritus and plankton
- The shell of Inarticulata is often:
- A) Heavily ornamented
- B) Smooth with a shiny surface
- C) Rough and pitted
- D) Transparent
Answer: B) Smooth with a shiny surface
- Inarticulata reproduce by releasing eggs into the water, which are:
- A) Fertilized internally
- B) Fertilized externally
- C) Self-fertilized
- D) Not fertilized
Answer: B) Fertilized externally
- What type of symmetry do Inarticulata exhibit?
- A) Asymmetry
- B) Radial symmetry
- C) Bilateral symmetry
- D) Pentaradial symmetry
Answer: C) Bilateral symmetry
- The ecological role of Inarticulata primarily includes:
- A) Acting as top predators
- B) Serving as prey for various marine species
- C) Creating habitats for other organisms
- D) All of the above
Answer: B) Serving as prey for various marine species
- Which of the following best describes the habitat of Inarticulata?
- A) Open ocean surface
- B) Intertidal zones and shallow seas
- C) Deep ocean trenches
- D) Freshwater lakes
Answer: B) Intertidal zones and shallow seas
- The shells of Inarticulata are usually:
- A) Calcified and porous
- B) Thin and fragile
- C) Thick and heavy
- D) Rigid and non-calcified
Answer: A) Calcified and porous
- Inarticulata can be identified by their:
- A) Bright colors
- B) Unique shell patterns
- C) Soft bodies and unhinged shells
- D) Presence of antennae
Answer: C) Soft bodies and unhinged shells
- The ecological significance of Inarticulata includes their role as:
- A) Indicators of environmental health
- B) Primary producers
- C) Major decomposers
- D) Both A and C
Answer: D) Both A and C