Structural Organisation in Animals Mock Test – Class 11 Biology

1. Examine the records about the significance of frogs.

Which record requires correction?

2. A group is most appropriately identified as a tissue when it consists of:

3. The relationship among the three muscle categories is represented most accurately by:

4. The sinus venosus is completely blocked at its opening into the right atrium, while the venae cavae continue delivering venous blood to it. The most immediate effect is:

5. Use the cross-sectional arrangement described below. Region P is a thin acellular covering. Region Q is a single columnar layer with secretory cells. Region R is the outer muscle layer, Region S is the deeper muscle layer, and Region T faces the coelom. Regions R and S are, respectively:

6. Household cockroaches can act as disease vectors most directly when they:

7. Examine the arrangement described below. Beneath an epithelial sheet lies a connective tissue with loosely scattered cells and fibres in semi-fluid ground substance. Fibroblasts, macrophages, and mast cells are present. This tissue is:

8. An earthworm has an intact peristomium and mouth, but its prostomium is experimentally immobilised. The most direct expected difficulty is:

9. Examine the statements below about earthworm cocoon development.
I. Mating involves exchange of spermatophores between two worms.
II. Gametes and nutritive fluid enter a cocoon associated with the clitellum.
III. Fertilisation and development occur inside the cocoon.
IV. A free-living larva emerges before becoming a young worm.

10. A temporary pond contains newly fertilised frog eggs, but it dries completely before the larvae can develop. Which outcome is most likely?

11. A connective band contains compact parallel collagen bundles and is repeatedly pulled along its long axis. This organisation is advantageous mainly as it:

12. A muscle sample consists of spindle-shaped cells that taper at both ends. No striations are visible, and the tissue forms part of the intestinal wall. It is:

13. Order the following descriptions from the lowest to the highest level of structural organisation.
P. Interacting organs contributing to a common function
Q. Similar cells with associated intercellular substances
R. Several tissues arranged as a functional body part
S. An individual specialised cell

14. The consequences of selectively impairing epithelial junctions are recorded below.

The most appropriate junctional assignments are:

15. Equal cultures of living ciliated bronchiolar epithelium are used. Treatment P receives a substance that stops ciliary beating without reducing cell viability or mucus production; the control receives no substance. Particle movement falls sharply only in P. The strongest conclusion is:

16. Relate each external aperture with its position. Each Column II entry is used once.

17. Relate each portal connection in a frog with the organs or regions it links. Each Column II entry is used once.

18. Link each nephridial type with its characteristic location and route. Each Column II entry is used once.

19. Assertion: The cockroach gizzard is well suited for mechanical processing of food.
Reason: It possesses thick circular muscles and six chitinous teeth that can act on the stored food entering from the crop.

20. Examine the records below.

The record requiring correction is:

21. Relate each frog organ with the system to which it primarily belongs. Each Column II entry is used once.

22. Antennae, maxillary and labial palps, compound eyes, and anal cerci occur in different body regions of a cockroach. Their shared relationship is that they:

23. Place the route taken by systemic venous blood as it approaches the frog heart.
P. Right atrium
Q. Major venae cavae
R. Sinus venosus

24. Assertion: Ciliated epithelium may be formed from cuboidal or columnar cells.
Reason: Cilia move mucus, particles, or other material in a definite direction over the epithelial surface.

25. The opening from the rectum into the cloaca of a male frog is blocked, while both urinogenital ducts remain open. Which pattern is most likely?

26. The collateral glands of a female cockroach stop secreting, while ova production, sperm storage, fertilisation, and movement through the oviducts remain normal. The most direct reproductive defect is:

27. The arrangement below is described in words. Region P consists of short branched processes approaching the cell body. Region Q is the cell body, Region R is one long process extending away from it, and Region S contains the terminal endings of that process. The usual direction of information flow is:

28. Cartilage at a joint loses much of its matrix pliability and compression resistance while its chondrocytes remain alive. The most direct mechanical consequence is:

29. An earthworm is injured across segments . The damage includes part of the blood-gland region but leaves segment of the gizzard intact. Which combined effect is most likely?

30. Cockroaches are tested in complete darkness on a path containing low obstacles. Control animals with intact antennae usually detect the obstacles before direct collision. Animals with both antennae removed collide more frequently, although their legs and head mobility remain normal. The result most strongly supports the conclusion that:

31. Equal cockroaches are kept at the same temperature and atmospheric oxygen level. In Group P, eight pairs of spiracles are sealed, while Group Q retains all ten pairs. P shows a major decline in oxygen uptake despite normal heart activity. The strongest inference is:

32. Associate each bone-related feature with its most appropriate description. Each Column II entry is used once.

33. Assess the following statements about sensory reception in an earthworm.
I. Eyes are absent.
II. Light-sensitive receptor cells permit detection of light.
III. Anterior chemoreceptors contribute to taste.
IV. Sensitivity to ground vibrations requires a specialised external ear.

34. After transfer from a warm shallow pond margin to a much colder shaded site, a frog experiences an immediate environmental-temperature change. No time is allowed for seasonal dormancy to begin. The most defensible prediction is that its body temperature will:

35. Assertion: A frog can exchange respiratory gases through its skin while submerged in water.
Reason: Dissolved oxygen can diffuse across the moist, vascular skin.

36. A circulation carries nutrients from the intestine, hormones from glands, respiratory gases, and metabolic wastes between distant organs. This evidence supports the classification of blood as:

37. A learner counts the sinus venosus and conus arteriosus as extra principal chambers of the frog heart. Which correction is accurate?

38. A gland produces its secretion normally, but the product accumulates within the gland after a passage leading to an epithelial surface becomes obstructed. This gland is most consistently classified as:

39. A learner identifies only segment as the clitellum of a mature earthworm. Which correction is accurate?

40. If a normally thin simple squamous lining of a gas-exchange surface becomes several times thicker without any compensatory increase in area, the most likely effect is:

41. Associate each earthworm structure with the defining relation supplied. Each Column II entry is used once.

42. Two matched soil plots contain the same plant species and receive equal water. Earthworms are excluded from Plot Q but remain active in Plot P. Later, Q has lower porosity, poorer aeration, and more restricted root penetration. The strongest conclusion is:

43. Pair each division of the frog nervous system with its principal components. Each Column II entry is used once.

44. Evaluate the following statements about respiration in an earthworm.
I. Specialised respiratory organs are absent.
II. Gases diffuse through the moist body surface.
III. Oxygen entering through the surface can reach the bloodstream.
IV. Drying of the body surface improves gaseous diffusion.

45. A specialised connective tissue contains living cells enclosed in small cavities within a solid but pliable matrix. It is most accurately identified as:

46. The cloacal aperture of a mature frog becomes completely blocked, but the rectum, ureters or urinogenital ducts, and reproductive ducts continue delivering material into the cloaca. Which outcome is most likely?

47. Assertion: The mesorchium helps maintain the position of each testis near the upper surface of a kidney.
Reason: The mesorchium is a double fold of peritoneum attaching the testis to the kidney.

48. The arrangement below is described in words. A skin sample contains fibroblasts among abundant collagen bundles running in many different orientations. The arrangement is best suited to:

49. The mushroom-shaped accessory gland of a male cockroach is non-functional, but the testes, vasa deferentia, seminal vesicles, and phallomeres remain intact. The most direct reproductive difficulty is:

50. A tracer introduced into earthworm blood remains within a continuous network of vessels and smaller branches throughout circulation; it is not released into open body sinuses. This observation identifies: