Exam (elaborations)
Animal Kingdom _ 75 A&R Test Items (38 challenging ones).
Animal Kingdom _ 75 A&R Test Items (38 challenging ones).
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MCQs_Animal Kingdom _ 75 A&R Test Items (with challenging ones)4.2 Classification of Animals
1. Assertion: Sponges exhibit the cellular level of organization. Reason: In sponges, cells are
arranged as loose cell aggregates.
2. Assertion: Coelenterates exhibit tissue level of organization. Reason: In coelenterates, cells
performing the same function are arranged into tissues.
3. Assertion: Platyhelminthes exhibit organ level of organization. Reason: Tissues are grouped to
form organs, each specialized for a particular function.
4. Assertion: Annelids, Arthropods, Mollusks, Echinoderms, and Chordates exhibit organ system
level of organization. Reason: Organs have associated to form functional systems, each system
concerned with a specific physiological function.
5. Assertion: Sponges are mostly asymmetrical. Reason: Animals can be categorized based on
their symmetry.
6. Assertion: Coelenterates, ctenophores, and echinoderms have radial symmetry. Reason:
Animals can be categorized based on their symmetry.
7. Assertion: Annelids, arthropods, etc., exhibit bilateral symmetry. Reason: Animals can be
categorized based on their symmetry.
8. Assertion: Platyhelminthes have an incomplete digestive system. Reason: The digestive system
has only a single opening to the outside of the body that serves as both mouth and anus.
9. Assertion: A complete digestive system is found in animals other than Platyhelminthes. Reason:
A complete digestive system has two openings, a mouth, and an anus.
10. Assertion: Two types of circulatory system: open and closed. Reason: Open type directly bathes
cells and tissues in blood pumped by heart, while closed type circulates blood through series of
vessels of varying diameters (arteries, veins, and capillaries).
4.2 Classification of Animals
11. Assertion: Echinodermata is classified in Kingdom Animalia based on common fundamental
features. Reason: Echinodermata exhibits radial or bilateral symmetry depending on the stage.
12. Assertion: Sponges have a water transport or canal system. Reason: Porifera is a phylum of
animals with a cellular level of organization.
13. Assertion: The pathway of water transport in sponges is helpful in food gathering, respiratory
exchange, and removal of waste. Reason: Water enters through minute pores (ostia) in the body
wall into a central cavity, spongocoel, from where it goes out through the osculum.
14. Assertion: Digestion in sponges is intracellular. Reason: Choanocytes or collar cells line the
spongocoel and the canals in sponges.
15. Assertion: Sponges have a distinctive body form. Reason: The body of sponges is supported by
a skeleton made up of spicules or spongin fibers.
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, MCQs_Animal Kingdom _ 75 A&R Test Items (with challenging ones)
16. Assertion: Sponges have an indirect development having a larval stage which is morphologically
distinct from the adult. Reason: Sponges reproduce asexually by fragmentation and sexually by
the formation of gametes.
17. Assertion: Cnidarians are named Cnidaria after the cnidoblasts or cnidocytes. Reason:
Cnidarians have cnidoblasts or cnidocytes that contain stinging capsules or nematocysts present
on the tentacles and the body.
18. Assertion: Cnidarians exhibit tissue level of organization and are diploblastic. Reason:
Cnidoblasts are used for anchorage, defense, and the capture of prey in cnidarians.
19. Assertion: Digestion is extracellular and intracellular in cnidarians. Reason: Cnidarians have a
central gastro-vascular cavity with a single opening, mouth on hypostome.
20. Assertion: Corals have a distinctive skeletal structure. Reason: Corals have a skeleton
composed of calcium carbonate.
21. Assertion: Ctenophores are radially symmetrical, diploblastic organisms with tissue level of
organization. Reason: Ctenophores have eight external rows of ciliated comb plates, which help in
locomotion.
22. Assertion: Platyhelminthes have a dorso-ventrally flattened body. Reason: Platyhelminthes are
bilaterally symmetrical, triploblastic, and acoelomate, and mostly endoparasites found in animals
including human beings.
23. Assertion: Aschelminthes are called roundworms. Reason: The body of the Aschelminthes is
circular in cross-section.
24. Assertion: Aschelminthes have an organ-system level of body organization. Reason:
Aschelminthes are bilaterally symmetrical, triploblastic, and pseudocoelomate.
25. Assertion: Aschelminthes have a pseudocoelomate body plan. Reason: Aschelminthes are
called roundworms because their body is circular in cross-section and have an organ-system level
of body organization.
26. Assertion: Aschelminthes can process food efficiently. Reason: The alimentary canal of
Aschelminthes is complete with a well-developed muscular pharynx.
27. Assertion: Annelids can maintain water balance and remove wastes from their bodies. Reason:
Nephridia of annelids help in osmoregulation and excretion.
28. Assertion: Earthworms and leeches can reproduce by themselves. Reason: Earthworms and
leeches are monoecious.
29. Assertion: Arthropods can move their legs and arms flexibly. Reason: Arthropods have jointed
appendages.
30. Assertion: Molluscs' body is protected and can avoid being eaten by predators. Reason:
Molluscs have a calcareous shell.
31. Assertion: Feather-like gills are present in the mantle cavity of mollusks. Reason: The space
between the visceral hump and the mantle in molluscs is called the mantle cavity.
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