Animal Kingdom Mock Test – Class 11 Biology

1. Consider the following statements about reptiles.
I. They are mainly terrestrial animals.
II. Their skin is dry and cornified.
III. Epidermal scales or scutes may cover the body.
IV. Every reptile is permanently aquatic and possesses moist scaleless skin.

2. Consider the following general features of vertebrates.
I. The heart may have two, three or four chambers.
II. Paired appendages may occur as fins or limbs.
III. Kidneys perform excretion and osmoregulation.
IV. Circulation is normally open.

3. A soft, spongy layer covers the visceral hump of a mollusc. The space between this layer and the hump is called the:

4. Consider the following statements about ctenophores.
I. They are exclusively marine.
II. They are radially symmetrical and diploblastic.
III. Their organisation is at the organ level.
IV. Their organisation is at the tissue level.

5. Consider the following statements about reproduction in Chondrichthyes.
I. Male and female individuals are separate.
II. Males possess claspers associated with the pelvic fins.
III. Fertilisation is usually external.
IV. Many members are viviparous.

6. Choose the complete mapping between each supporting material and animal group. A Column II entry is used once.

7. Numerous fine tubes branch inward from openings on an arthropod's body surface and extend toward internal tissues. No blood vessels carry air from a central respiratory organ. This arrangement most directly represents:

8. Match each named organism with its specialised relation. A Column II entry is used once.

9. Consider the following statements about sex condition in aschelminths.
I. Male and female reproductive functions occur in separate individuals.
II. Females are often longer than males.
III. The term dioecious describes their separate-sex condition.
IV. Their sex condition is identical to the generally hermaphroditic condition of platyhelminths.

10. Consider the following statements about molluscan reproduction and development.
I. Sexes are usually separate.
II. Most molluscs are oviparous.
III. Development is generally indirect.
IV. Every mollusc is necessarily monoecious and viviparous.

11. An originally bilaterally symmetrical animal is injured on one side and later appears irregular. Its undamaged developmental pattern shows that one plane normally produces corresponding right and left halves. The most justified conclusion is that the animal:

12. Examine the axial-structure records.

The correct identification of P, Q and R is:

13. A cnidarian captures prey successfully and transfers it through the mouth into the central cavity. Enzyme release into the cavity is then blocked, but cells of the inner layer can still engulf small particles. Which effect is most likely?

14. Consider the following statements about poisonous snakes.
I. Naja is the cobra.
II. Bungarus is the krait.
III. Vipera is the viper.
IV. Every snake species is poisonous.

15. Which set contains only correctly classified examples?

16. Two groups of ctenophores are maintained under identical conditions. In group P, comb plates beat normally. In group Q, comb plates are immobilised, but the animals remain alive and continue emitting light. Group Q moves far less than P. The strongest inference is that:

17. An embryo possesses a flexible mesodermal rod, a hollow single nerve cord dorsal to it, paired slits in the pharyngeal region and a tail extending beyond the anus. This combination most strongly establishes membership in:

18. Complete the fish-class comparison.

R and S should be:

19. An animal has specialised cells, but these cells are not arranged into true tissues. Its level of organisation is:

20. A jawed-vertebrate tree divides into branch P, characterised by paired fins, and branch Q, characterised by limbs. P and Q are respectively:

21. A mollusc has normal mantle-cavity water flow and an intact radula, but most of its feather-like gills are damaged. Which paired disturbance is expected most directly?

22. An unknown animal has true tissues, two primary germ layers and a body that can be divided into comparable halves by several planes through a central axis. Its profile is compatible with:

23. Two segmented animals are compared. Specimen P has a chitinous external covering and limbs that bend at definite joints. Specimen Q has visible external rings but no articulated appendages. Which feature most directly justifies applying the name Arthropoda to specimen P?

24. An endoparasitic animal is dorsoventrally flattened, bilaterally symmetrical and acoelomate. Hooks and suckers assist attachment, while flame cells perform excretion and osmoregulation. Which phylum is indicated?

25. An adult frog is resting on moist land. Its lungs are functioning, and its exposed skin remains wet and richly supplied with blood. Which interpretation is most appropriate?

26. Match each avian genus with its common name. A Column II entry is used once.

27. Which organism provides a counterexample to the claim that every chordate is a vertebrate?

28. Two comparable cartilaginous fishes are placed in well-oxygenated seawater. In specimen P, all separate gill slits remain open. In specimen Q, the slits are temporarily sealed while the mouth and heart continue functioning. Q rapidly shows impaired gas exchange. The strongest inference is that:

29. An embryo possesses a notochord and dorsal hollow nerve cord, and the adult develops a cartilaginous vertebral column. No jaws are formed. At the first jaw-based branch of vertebrate classification, the animal should be:

30. Evaluate the following statements about the general cnidarian body plan.
I. Cnidarians are aquatic and mostly marine.
II. Their organisation is at the tissue level.
III. They are radially symmetrical and diploblastic.
IV. Every cnidarian is permanently attached to a substrate.

31. Because Pteropus is commonly called a flying fox, a learner groups it with familiar terrestrial carnivores and excludes it from Mammalia on account of flight. Which correction is most accurate?

32. A marine animal has a radially symmetrical adult, a bilaterally symmetrical larva, calcareous ossicles and a complete alimentary canal with a ventral mouth and dorsal anus. Which feature combination most strongly separates it from a cnidarian?

33. Consider the following statements about aschelminths.
I. Their body is circular in cross-section.
II. Free-living forms may occur in aquatic or terrestrial environments.
III. Parasitic forms may infect plants or animals.
IV. Every member is an endoparasite of humans.

34. A soft-bodied animal has a muscular foot, visceral hump and mantle cavity. Male and female individuals are separate, eggs are produced, and a larval stage differs from the adult. This combination represents:

35. Match each organism with its phylum. A Column II entry is used once.

36. A living cyclostome remains in contact with its fish host, but the muscles operating its circular sucking mouth are temporarily paralysed. Which effect is most directly expected?

37. Study the worm-group comparison.

The correct classification of P, Q and R is:

38. A limbless animal and a four-limbed animal both possess dry cornified skin, lungs, internal fertilisation and direct development. Which conclusion is most defensible?

39. Compare the two cnidarian forms described below.

The correct identification of P and Q is:

40. Examination of a feathered vertebrate shows dry skin with very few glands. One specialised gland occurs near the base of the tail. Which interpretation best fits these findings?

41. Arrange the following observations in the developmental order expected for Branchiostoma.
P. A true notochord forms during early development.
Q. The larval animal displays the notochord from the anterior region to the tail.
R. The adult retains the head-to-tail notochord.

42. In a longitudinal section of an unknown animal, tube P lies along the ventral side and is solid and double. Organ Q lies dorsally and pumps circulating fluid. Which interpretation is most consistent?

43. An amphibian’s cloacal opening becomes completely blocked while its digestive, urinary and reproductive organs remain functional. Which immediate consequence is most likely?

44. Consider the following statements.
I. Many chondrichthyans are viviparous.
II. Most mammals are viviparous.
III. Ornithorhynchus is an oviparous mammal.
IV. Viviparity is universal in both Chondrichthyes and Mammalia.

45. Consider the following statements about triploblastic animals.
I. Mesoderm lies between ectoderm and endoderm.
II. Mesoglea is another name for mesoderm.
III. Every triploblastic animal possesses a true coelom.
IV. Platyhelminths are triploblastic despite being acoelomate.

46. Match each poriferan component with the relation that identifies it. A Column II entry is used once.

47. A mollusc retains a normal head, visceral hump and mantle, but the muscular foot is severely damaged. Which effect is most directly expected?

48. Match each platyhelminth example or feature with its correct relation. A Column II entry is used once.

49. Assertion: Metagenesis in Obelia involves alternation between polyp and medusa phases.
Reason: Polyps produce medusae asexually, while medusae participate in sexual reproduction that gives rise to the polyp generation.

50. The specialised structures responsible for excretion and osmoregulation in platyhelminths are: