Homoscleromorpha MCQs December 4, 2025September 30, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. What is a defining characteristic of sponges in the class Homoscleromorpha? (A) A well-defined basal lamina (B) Possession of siliceous spicules (C) Presence of calcareous spicules (D) Ability to photosynthesize 2. Homoscleromorpha sponges are primarily found in which type of habitat? (A) Marine environments (B) Terrestrial (C) Freshwater (D) Intertidal zones only 3. What is the primary body plan exhibited by Homoscleromorpha sponges? (A) Asconoid (B) None of the above (C) Leuconoid (D) Syconoid 4. Which of the following best describes the structure of Homoscleromorpha sponges? (A) They have a rigid skeleton (B) They have a gelatinous body (C) They possess a combination of soft and hard structures (D) They are entirely soft-bodied 5. Which of the following features is common in Homoscleromorpha sponges? (A) Presence of unique pinacocytes (B) Lack of true tissues (C) High levels of symmetry (D) Ability to form a skeleton 6. What type of spicules are typically found in Homoscleromorpha sponges? (A) Calcareous spicules (B) They lack spicules (C) Organic spicules (D) Siliceous spicules 7. Which of the following is NOT a characteristic of Homoscleromorpha sponges? (A) Presence of a basal lamina (B) Association with coral reefs (C) Siliceous spicules (D) Possession of true tissues 8. Homoscleromorpha sponges are known to exhibit which of the following types of reproduction? (A) Asexual reproduction only (B) Both asexual and sexual reproduction (C) Sexual reproduction only (D) Budding only 9. What type of feeding mechanism do Homoscleromorpha sponges primarily utilize? (A) Filter feeding (B) Absorption (C) Predation (D) Photosynthesis 10. Which of the following is a common genus of Homoscleromorpha sponges? (A) Haliclona (B) Oscarella (C) Clathrina (D) Spongilla 11. What is the ecological role of Homoscleromorpha sponges? (A) Habitat providers and filter feeders (B) Primary producers (C) Decomposers (D) Top predators 12. What is the significance of the unique cellular organization in Homoscleromorpha sponges? (A) It allows for complex organ systems (B) It provides structural support (C) It enhances water filtration efficiency (D) It aids in locomotion 13. What is the primary function of choanocytes in Homoscleromorpha sponges? (A) To provide structural support (B) To aid in reproduction (C) To facilitate water flow and filter feeding (D) To assist in locomotion 14. Homoscleromorpha sponges exhibit what type of symmetry? (A) Radial symmetry (B) Asymmetry (C) Bilateral symmetry (D) Spherical symmetry 15. What type of larval stage do Homoscleromorpha sponges undergo? (A) Parenchymella (B) Planula (C) Trochophore (D) Veliger 16. Which of the following describes the skeletal structure of Homoscleromorpha sponges? (A) Composed entirely of calcium carbonate (B) Composed of spongin and siliceous spicules (C) Rigid and inflexible (D) Lacking a true skeletal structure 17. In terms of biodiversity, Homoscleromorpha sponges are considered: (A) Highly diverse (B) Extinct (C) Less diverse than other sponge classes (D) Invasive species 18. Which of the following best describes the feeding process in Homoscleromorpha sponges? (A) They actively hunt for prey (B) They absorb dissolved nutrients (C) They filter particles from water (D) They photosynthesize 19. Which environment is most commonly associated with Homoscleromorpha sponges? (A) Freshwater lakes (B) Coral reefs (C) Deep-sea vents (D) Sandy beaches 20. What is the primary role of pinacocytes in Homoscleromorpha sponges? (A) To aid in reproduction (B) To form the outer layer of the sponge (C) To facilitate water flow (D) To produce spicules 21. Which of the following statements is true regarding Homoscleromorpha sponges? (A) They have a simple body plan (B) They are entirely soft-bodied (C) They exhibit high levels of complexity (D) They are the most primitive sponges 22. What is the primary composition of the body of Homoscleromorpha sponges? (A) Calcium carbonate (B) Silica and spongin (C) Chitin (D) Organic matter 23. Homoscleromorpha sponges are characterized by their: (A) Unique cellular organization (B) Ability to thrive only in freshwater (C) High metabolic rates (D) Rapid growth rates 24. Which of the following is a significant aspect of Homoscleromorpha sponge biology? (A) They can regenerate lost parts (B) They can form large colonies (C) They exhibit high levels of predation (D) They have no known predators 25. Which ecological role do Homoscleromorpha sponges fulfill? (A) Primary consumers (B) Secondary producers (C) Filter feeders and habitat providers (D) Decomposers 26. What type of spicules are found in Homoscleromorpha sponges? (A) Calcium carbonate spicules (B) Siliceous spicules (C) Both A and B (D) None of the above 27. Homoscleromorpha sponges are often distinguished from other sponges by their: (A) Hard exoskeleton (B) Unique pinacocyte structure (C) True tissues (D) Ability to photosynthesize 28. Which of the following statements about Homoscleromorpha sponges is correct? (A) They are exclusively marine (B) They are only found in shallow waters (C) They possess a defined body plan (D) They can exhibit various forms and shapes 29. What is the role of the osculum in Homoscleromorpha sponges? (A) Water outflow (B) Excretion of waste (C) Ingestion of food (D) Oxygen absorption 30. In which habitat are Homoscleromorpha sponges typically found? (A) Extreme cold waters (B) Coastal and deep-sea environments (C) Terrestrial environments (D) Polar regions