Animal Kingdom Mock Test – Class 11 Biology

1. Two comparable arthropods feed and respire normally. Malpighian tubules function in specimen P but are severely blocked in specimen Q. Q begins accumulating metabolic wastes. The strongest inference is that Malpighian tubules:

2. Match each supporting system with the animal group it most directly identifies. A Column II entry is used once.

3. In a bird, compact organs P perform gas exchange. Several thin-walled sacs Q connect with P and extend into different body regions. P and Q are respectively:

4. The partial classification table below leaves one decision unresolved.

Which additional observation would most directly resolve branch Q?

5. In the stated molluscan body plan, a radula is:

6. Assertion: Every vertebrate is a chordate.
Reason: Vertebrates possess a true embryonic notochord before it is replaced by a cartilaginous or bony vertebral column.

7. One entry in the arthropod reproductive record is inaccurate.

Which correction is required?

8. Struthio, Aptenodytes and Neophron are respectively:

9. Use the arrangement described below. Region P forms the anterior proboscis, region Q is a short collar immediately behind it, and region R is the long trunk. A rudimentary rod-like structure occurs within Q. Which interpretation is correct?

10. Suppose the cavity of an otherwise typical aschelminth becomes completely lined by mesoderm during development. If all other observations remain unchanged, which classification statement follows?

11. The notochord is best described as a:

12. 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.

13. Consider the following statements about excretion in echinoderms.
I. A specialised excretory system is absent.
II. This absence does not remove their organ-system level of organisation.
III. Absence of an excretory system means that metabolic wastes are never produced.
IV. The condition should not be confused with cellular-level organisation.

14. Match each combined profile with the correct phylum. A Column II entry is used once.

15. A mature cyclostome that normally lives in the ocean is captured moving upstream in freshwater with fully developed gametes. Which inference is most appropriate?

16. A specimen register identifies Meandrina as brain coral and Physalia as Portuguese man-of-war. Which conclusion is most accurate?

17. A description of normal sponge water flow ends after water enters through ostia, passes through canals and reaches the spongocoel. What is the missing final relation?

18. Assertion: The avian endoskeleton is fully ossified.
Reason: Pneumatic bones are unossified membranous sacs that contain no bone tissue.

19. Let represent the polyp, the medusa, an asexual transition and a sexual transition. Which relation correctly represents metagenesis in Obelia?

20. An animal is exclusively marine. Its larva is bilateral, its adult is radial, calcareous ossicles form an endoskeleton, and a water vascular system assists movement and feeding. Which taxonomic relationship is best supported?

21. Use the body arrangement described below. Region P is an anterior head, Q is a broad ventral muscular surface, R is a dorsal visceral hump and membrane S surrounds R to form a cavity containing feather-like gills. Which phylum is indicated?

22. One entry in the vertebrate branching table is inaccurate.

Which correction is required?

23. An unknown fish has a bony endoskeleton, cycloid scales, a usually terminal mouth, pairs of operculum-covered gills and an air bladder. Its heart has one auricle and one ventricle. Which classification is best supported?

24. Specimen P moves by alternating circular and longitudinal muscle contractions and has nephridia with closed circulation. Specimen Q moves using articulated legs and has open circulation. P and Q are most consistently classified as:

25. Assertion: Any vertebrate with a four-chambered heart must belong to Aves.
Reason: Crocodiles and mammals also possess four-chambered hearts, so body covering and other class characters must be examined.

26. Two groups of arthropods have equally functional muscles and appendage joints. In group P, the chitinous covering remains normal. In group Q, a treatment selectively softens the chitinous covering. Q shows greater deformation of the body under the same external pressure. The result supports the conclusion that chitin:

27. A collection contains Anopheles, Culex, Aedes and Apis. The first three are grouped together on the basis of one applied biological relation, while Apis is placed separately. The grouping is best explained by the fact that:

28. 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?

29. A diagram of an osteichthyan labels pairs of gills but records only individual gills. One member of each pair lies on each side of the head. Which correction is required?

30. Assertion: Platyhelminths are triploblastic animals that can still be acoelomate.
Reason: Platyhelminths show organ-level organisation.

31. A vertebrate spends its early life in water and later moves regularly between a pond margin and moist land. The adult has a head and trunk, pairs of limbs and no tail. Which conclusion is best supported?

32. A simplified decision arrangement places all animals with radial symmetry on a branch labelled “diploblastic tissue-grade animals.” An adult starfish is then entered into the arrangement. What is the main defect in this decision rule?

33. An unknown worm is elongated, unsegmented and circular in cross-section. It is bilaterally symmetrical, triploblastic and organised at the organ-system level. Its body cavity lacks complete mesodermal lining, and its alimentary canal has separate entry and exit openings. The specimen belongs to:

34. Use the pathway described below. Wastes move from the body cavity into structure P, pass along P, and leave through opening Q on the body surface. In an aschelminth, P and Q are respectively:

35. Arrange the following events in a general sexual life history of an aschelminth showing indirect development.
P. Male and female individuals form gametes.
Q. Internal fertilisation occurs.
R. An immature developmental stage appears.
S. The mature form is established.

36. One structure-function entry is incorrect.

Which correction is required?

37. Use the two arrangements described below. In form P, the body is cylindrical, its basal end is attached, and the mouth with tentacles is directed away from the substrate. In form Q, the body is umbrella-shaped and moves freely in water. Which pair identifies them?

38. Consider the following statements about respiration in arthropods.
I. Different arthropod groups may use different respiratory organs.
II. Gills, book gills, book lungs and tracheal systems occur within the phylum.
III. Every arthropod possesses all four respiratory systems simultaneously.
IV. The respiratory structure must be interpreted with the animal’s body plan and environment.

39. A graph plots environmental temperature on the horizontal axis and body temperature of a lizard on the vertical axis. The lizard’s body temperature rises and falls broadly with the environment instead of remaining nearly constant. The pattern indicates:

40. An exclusively marine animal has organ-system organisation, a spiny external appearance and an internal skeleton of calcareous ossicles. No chitinous covering or jointed appendages are present. The animal belongs to:

41. Compare the three cross-sectional records.

The correct sequence for P, Q and R is:

42. Two animals show the following character combinations.

The specimens are most consistently classified as:

43. Four observations are recorded for an unknown animal.

Which interpretation uses the observations most accurately?

44. Consider the following statements about Urochordata.
I. Members are exclusively marine.
II. The notochord is confined to the larval tail.
III. The adult retains a notochord extending from head to tail.
IV. Urochordata is also called Tunicata.

45. Equal groups of parasitic flatworms are placed on suitable host tissue. In treatment P, hooks and suckers function normally. In treatment Q, both attachment structures are temporarily disabled without affecting movement or metabolism. Far fewer worms remain attached in Q. The strongest inference is that:

46. Assertion: Moist amphibian skin can contribute to respiratory gas exchange.
Reason: Amphibian skin is covered by dry cornified scales that prevent diffusion across its surface.

47. Consider the following statements.
I. Closed circulation occurs in annelids and chordates.
II. Open circulation occurs in arthropods and generally in molluscs.
III. An open system means that circulating fluid may directly bathe tissues in spaces.
IV. A closed system requires every animal to use lungs for respiration.

48. An unknown animal is bilateral, triploblastic and segmented, with organ-system organisation. Its body bears a chitinous external covering and paired jointed appendages. The most justified placement is:

49. Two unrelated animals live permanently in seawater and both possess streamlined bodies. If classification is based only on these similarities, the most likely error is that:

50. One row in the applied arthropod table is incorrect.

Which replacement repairs the table?