Seisonidea MCQs January 8, 2026September 30, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. What is the primary habitat of Seisonidea? (A) Freshwater (B) Terrestrial (C) Marine (D) Brackish water 2. Seisonidea are classified under which larger group of organisms? (A) Annelids (B) Cnidarians (C) Rotifera (D) Mollusks 3. Which of the following is a defining characteristic of Seisonidea? (A) Presence of a corona (B) Lack of a foot (C) Presence of two ovaries (D) Absence of cilia 4. What is the primary mode of locomotion for Seisonidea? (A) Crawling (B) Swimming using flagella (C) Floating passively (D) Ciliary movement 5. What type of symmetry do Seisonidea typically exhibit? (A) Radial symmetry (B) Bilateral symmetry (C) Asymmetry (D) Pentaradial symmetry 6. Which of the following structures do Seisonidea use for feeding? (A) Ciliated corona (B) Tentacles (C) Specialized jaws (D) Siphons 7. What type of reproductive strategy is common in Seisonidea? (A) Budding (B) Asexual reproduction only (C) Sexual reproduction (D) Fragmentation 8. Which of the following genera is classified under Seisonidea? (A) Brachionus (B) Monostyla (C) Asplanchna (D) Seison 9. What is a unique feature of the Seisonidea life cycle? (A) Direct development (B) Presence of a resting stage (C) Absence of larval stages (D) Continuous reproduction 10. What ecological role do Seisonidea typically play? (A) Primary producers (B) Consumers and decomposers (C) Parasites (D) Keystone species 11. Which type of feeding mechanism do Seisonidea utilize? (A) Absorptive feeding (B) Grazing (C) Predatory feeding (D) Filter feeding 12. What kind of body plan do Seisonidea exhibit? (A) Unsegmented (B) Segmented (C) Radially symmetrical (D) Pseudocoelomate 13. Seisonidea are often found associated with which of the following organisms? (A) Crustaceans (B) Algae (C) Fungi (D) Plants 14. Which of the following statements about Seisonidea is true? (A) They are exclusively freshwater organisms (B) They have a simple body structure (C) They possess complex nervous systems (D) They are obligate parasites 15. What is the primary function of the foot in Seisonidea? (A) Attachment to substrates (B) Locomotion (C) Feeding (D) Excretion 16. What type of sensory structures do Seisonidea possess? (A) Antennae (B) Compound eyes (C) Tentacles (D) Sensory bristles 17. Which of the following describes the ecological significance of Seisonidea? (A) They are top predators in their ecosystem (B) They have no ecological impact (C) They serve as primary producers (D) They help control algal populations 18. What type of reproduction can occur in Seisonidea? (A) Only asexual reproduction (B) Both sexual and asexual reproduction (C) Budding only (D) No reproduction 19. What feature distinguishes Seisonidea from other rotifers? (A) Their color (B) Their association with crustaceans (C) Their size (D) Their feeding habits 20. What type of larvae do Seisonidea produce? (A) Free-swimming larvae (B) Directly developed larvae (C) Non-motile larvae (D) Cystic larvae 21. In terms of ecological roles, Seisonidea primarily serve as what? (A) Prey for larger organisms (B) Predators (C) Primary producers (D) Decomposers only 22. Which of the following is NOT a characteristic of Seisonidea? (A) Presence of cilia (B) Marine habitat (C) Exclusively terrestrial (D) Simple body structure 23. What do Seisonidea feed on? (A) Microorganisms and organic particles (B) Larger zooplankton (C) Plant material (D) Sediment 24. Which class of Rotifera does Seisonidea belong to? (A) Monogononta (B) Digononta (C) Bdelloidea (D) Seisonidea 25. What is the main advantage of the resting stage in Seisonidea? (A) Increased feeding efficiency (B) Survival during unfavorable conditions (C) Enhanced locomotion (D) Greater reproductive success 26. What type of circulatory system do Seisonidea have? (A) Open circulatory system (B) No circulatory system (C) Closed circulatory system (D) Simple vascular system 27. How do Seisonidea contribute to nutrient cycling in their environment? (A) By breaking down organic matter (B) By consuming large organisms (C) By producing nutrients (D) By forming symbiotic relationships 28. What type of habitat is most conducive for Seisonidea? (A) Polluted waters (B) Clean, clear waters (C) Stagnant waters (D) Alkaline lakes 29. Seisonidea are often studied in relation to which of the following fields? (A) Botany (B) Ornithology (C) Genetics (D) Marine biology 30. Which of the following adaptations helps Seisonidea survive in their environment? (A) Large size (B) Resting stage during unfavorable conditions (C) Complex behavior (D) Fast swimming ability