- What is the common name for members of the class Aplacophora?
- A) Worm-like mollusks
- B) Bivalves
- C) Snails
- D) Cephalopods
Answer: A) Worm-like mollusks
- Which of the following describes the body structure of Aplacophora?
- A) Segmented body with a shell
- B) Smooth, elongated, and unsegmented
- C) Coiled and spiral-shaped
- D) Flattened and leaf-like
Answer: B) Smooth, elongated, and unsegmented
- What type of habitat do Aplacophora primarily inhabit?
- A) Freshwater environments
- B) Terrestrial habitats
- C) Deep-sea marine environments
- D) Coastal tidal zones
Answer: C) Deep-sea marine environments
- Which feeding method is common among Aplacophora?
- A) Predation
- B) Filter feeding
- C) Deposit feeding
- D) Herbivory
Answer: C) Deposit feeding
- Aplacophora lack which of the following structures?
- A) Gills
- B) Shell
- C) Foot
- D) Radula
Answer: B) Shell
- Which of the following features is characteristic of Aplacophora?
- A) Presence of tentacles
- B) Bioluminescent capabilities
- C) A spiny or scaly outer surface
- D) Complex eyes
Answer: C) A spiny or scaly outer surface
- What is the primary ecological role of Aplacophora?
- A) Predators
- B) Scavengers and decomposers
- C) Primary producers
- D) Parasites
Answer: B) Scavengers and decomposers
- Aplacophora are most closely related to which other class of mollusks?
- A) Gastropoda
- B) Bivalvia
- C) Polyplacophora
- D) Cephalopoda
Answer: C) Polyplacophora
- How do Aplacophora reproduce?
- A) Asexually through budding
- B) External fertilization
- C) Internal fertilization
- D) Fragmentation
Answer: B) External fertilization
- What type of circulatory system do Aplacophora possess?
- A) Open circulatory system
- B) Closed circulatory system
- C) No circulatory system
- D) Hemocoel
Answer: A) Open circulatory system
- What structure is primarily responsible for locomotion in Aplacophora?
- A) Tentacles
- B) Foot
- C) Cilia
- D) Siphon
Answer: C) Cilia
- Which of the following is a common genus of Aplacophora?
- A) Chaetoderma
- B) Dentalium
- C) Nautilus
- D) Helix
Answer: A) Chaetoderma
- What type of symmetry do Aplacophora exhibit?
- A) Bilateral symmetry
- B) Radial symmetry
- C) Asymmetry
- D) None of the above
Answer: A) Bilateral symmetry
- The body of Aplacophora is covered with what type of structure?
- A) Scales
- B) Spicules
- C) Tentacles
- D) Shells
Answer: B) Spicules
- What is the larval stage of Aplacophora called?
- A) Veliger
- B) Trochophore
- C) Nauplius
- D) Zoea
Answer: B) Trochophore
- Aplacophora typically feed on:
- A) Coral
- B) Algae and detritus
- C) Plankton
- D) Small fish
Answer: B) Algae and detritus
- What kind of reproduction strategy do Aplacophora employ?
- A) Budding
- B) Asexual reproduction
- C) Sexual reproduction
- D) Parthenogenesis
Answer: C) Sexual reproduction
- The nervous system of Aplacophora can be described as:
- A) Highly developed with a brain
- B) Simple and decentralized
- C) Non-functional
- D) Extremely complex
Answer: B) Simple and decentralized
- Which of the following adaptations helps Aplacophora in their environment?
- A) Ability to swim
- B) Camouflage
- C) Burrowing behavior
- D) Both B and C
Answer: D) Both B and C
- What is the main diet of Aplacophora?
- A) Coral
- B) Detritus and microorganisms
- C) Algae
- D) Larger prey like fish
Answer: B) Detritus and microorganisms
- Which feature is notable about the locomotion of Aplacophora?
- A) They swim using fins
- B) They crawl using a muscular foot
- C) They glide on mucus
- D) They use cilia on their body surface
Answer: D) They use cilia on their body surface
- The shell-less condition of Aplacophora is believed to be:
- A) An evolutionary adaptation
- B) A primitive characteristic
- C) A developmental anomaly
- D) A result of environmental pressures
Answer: A) An evolutionary adaptation
- What type of digestive system do Aplacophora possess?
- A) Complete digestive tract
- B) Incomplete digestive tract
- C) No digestive system
- D) Complex multi-chambered system
Answer: A) Complete digestive tract
- Which of the following structures is primarily used for excretion in Aplacophora?
- A) Gills
- B) Nephridia
- C) Mantle
- D) Foot
Answer: B) Nephridia
- Aplacophora are primarily:
- A) Terrestrial
- B) Freshwater
- C) Marine
- D) Parasites
Answer: C) Marine
- What role do Aplacophora play in the marine ecosystem?
- A) Primary producers
- B) Scavengers
- C) Predators
- D) Herbivores
Answer: B) Scavengers
- Which of the following is a characteristic of Aplacophora’s reproductive strategy?
- A) They have a high reproductive rate
- B) They exhibit parental care
- C) They produce a single offspring
- D) They are hermaphroditic
Answer: A) They have a high reproductive rate
- Aplacophora can be found at what depths in the ocean?
- A) Shallow coastal waters
- B) Up to several thousand meters deep
- C) Only at the surface
- D) Only in tidal pools
Answer: B) Up to several thousand meters deep
- What is the main ecological impact of Aplacophora?
- A) They contribute to coral reef building
- B) They break down organic matter
- C) They provide food for larger predators
- D) They create habitats for other organisms
Answer: B) They break down organic matter
- Which of the following adaptations helps Aplacophora thrive in their environment?
- A) Their ability to produce toxins
- B) Their smooth body allowing for easy burrowing
- C) Their spicules providing protection
- D) Their complex camouflage
Answer: C) Their spicules providing protection