Structural Organisation in Animals Mock Test – Class 11 Biology

1. Evaluate the following statements about cartilage and bone.
I. Both are specialised connective tissues with living cells located in lacunae.
II. Cartilage has a solid but pliable matrix, whereas bone has a hard mineral-rich matrix.
III. Marrow in some bones participates in blood-cell formation.
IV. Cartilage occurs at sites such as the nose tip, outer ear, joints, and between adjacent vertebral bones.

2. Evaluate the following statements about digestive and excretory structures at the junctions of the cockroach gut.
I. A ring of hepatic caeca occurs at the foregut-midgut junction.
II. Hepatic caeca secrete digestive juice.
III. About Malpighian tubules arise near the midgut-hindgut junction.
IV. Malpighian tubules primarily grind food entering from the crop.

3. An earthworm is transferred from moist soil to a dry surface while air remains available. If water loss from the skin is not prevented, the most likely early consequence is:

4. Associate each male reproductive structure with its most appropriate relation. Each Column II entry is used once.

5. Sequence the pathway followed by oxygen from the environment to a cockroach body cell.
P. Oxygen enters a fine tracheole.
Q. Oxygen passes through a lateral spiracle.
R. Oxygen diffuses from the tracheole to the nearby cell.
S. Oxygen travels through a larger tracheal tube.

6. Compare the two tissue samples shown below.

The most suitable identification is:

7. 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:

8. Assess the following statements about cockroach respiration.
I. Ten pairs of spiracles occur along the lateral sides of the body.
II. Spiracles open into tracheae that branch into finer tracheoles.
III. Gas exchange occurs mainly between haemolymph and tissues through capillaries.
IV. Tracheoles deliver air close to cells, where diffusion occurs.

9. Sequence the three major body regions of a cockroach from the anterior end toward the posterior end.
P. Abdomen
Q. Head
R. Thorax

10. A ductless gland in a frog stops releasing its chemical messenger, while the brain, spinal cord, and peripheral nerves remain intact. Which interpretation is most appropriate?

11. Examine the observations and provisional functions shown below.

Which samples require correction of their stated main functions?

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

13. 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.

14. Compare a cockroach nymph with an adult.

Which conclusion is best supported?

15. The forewings and hind wings of a cockroach share a thoracic origin but differ in structure and role. Which relation is correct?

16. Secretory unit P is one goblet cell releasing mucus onto an epithelial surface. Secretory unit Q is a cluster of cells with no duct, releasing hormones into the surrounding fluid. Which comparison is correct?

17. Let represent frog body temperature and environmental temperature. Which relation expresses poikilothermy without claiming exact equality at every moment?

18. Damage is confined to segments of an earthworm and destroys the paired nephridial tufts associated with the pharyngeal region. Which nephridial type is affected most directly?

19. A female cockroach has two ovaries, each with ovarioles. In one ovary, ovarioles become non-functional; in the other, become non-functional. How many functional ovarioles remain altogether?

20. Examine the statements below about Rana tigrina and its classification.
I. Rana tigrina is used as the named common Indian frog.
II. Frogs can live on land and in freshwater.
III. Class Amphibia is included within phylum Chordata.
IV. Frogs are described as exclusively marine animals.

21. Suppose the cells of an epithelial covering become widely separated by abundant intercellular material while the exposed surface remains under mechanical stress. The most immediate functional consequence would be:

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

23. Earthworms choose between two moist chambers. Chamber P is dark but contains an unattractive chemical cue; Chamber Q is illuminated but contains an attractive food-related cue. After anterior chemoreceptors are disabled, the worms avoid Q mainly when their light-sensitive receptors remain functional. Which inference is strongest?

24. Two cockroach groups have equally hardened tergites and sternites. In Group P, the arthrodial membranes remain flexible. In Group Q, those membranes are experimentally stiffened without damaging the plates. Group Q shows much less bending between adjacent body regions. The strongest inference is:

25. Assertion: Epithelium forms a continuous covering or lining.
Reason: Epithelial cells are closely packed and have little intercellular matrix.

26. A stomach lining is formed by a single layer of tall slender cells whose nuclei lie nearer the basal region. The free surface is specialised for secretion and absorption. This description identifies:

27. Pair each epithelial junction with its principal role. Each Column II entry is used once.

28. Interpret the internal arrangement described below. Structure P lies below the alimentary canal and contains repeated ganglionic enlargements. Structure Q lies above the oesophagus in the head and sends nerves to the antennae and compound eyes. P and Q are, respectively:

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

30. Sequence the following events in a neuronal response.
P. An adjacent neuron or another cell is stimulated or inhibited.
Q. A suitable stimulus acts on the neuron.
R. The disturbance reaches the neuronal endings.
S. An electrical disturbance travels along the neuronal plasma membrane.

31. Which statement correctly distinguishes the cloaca from the cloacal aperture in a frog?

32. A frog is described as ureotelic because it:

33. Pair each neural component with its principal role. Each Column II entry is used once.

34. Which statement correctly distinguishes absorption from egestion in a frog?

35. Review the statements given below about simple cuboidal epithelium.
I. Its cells are approximately cube-like.
II. It commonly occurs in gland ducts and tubular parts of nephrons.
III. Proximal convoluted tubule cells lack surface microvilli.
IV. Secretion and absorption are important functions.

36. Examine the statements below about the earthworm body wall.
I. The cuticle is a thin non-cellular covering.
II. The epidermis is a single layer of columnar cells containing secretory gland cells.
III. Longitudinal muscle lies external to circular muscle.
IV. Coelomic epithelium forms the innermost layer.

37. A tissue sample contains cells widely separated by fibres and ground substance. It lies between other tissues and contributes to binding and support. Its classification is:

38. Smooth muscle in the wall of a blood vessel relaxes while the epithelial lining and connective support remain intact. Which immediate change is most likely?

39. The route records below are evaluated.

Which record requires correction?

40. Place the events in one simplified cycle of haemolymph movement through the cockroach circulatory system.
P. Haemolymph enters the dorsal heart through lateral ostia.
Q. Haemolymph bathes internal organs within haemocoelic sinuses.
R. The heart pumps haemolymph anteriorly.
S. Haemolymph returns from the sinuses toward the heart.

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

42. Sequence the following events in the pathway by which oxygen reaches internal tissues of an earthworm.
P. Oxygen enters blood vessels associated with the body wall.
Q. Oxygen reaches internal tissues through circulation.
R. Oxygen dissolves in moisture on the body surface.
S. Oxygen diffuses across the body surface.

43. The reproductive functions shown below are provisionally assigned.

The assignment requiring correction is:

44. A cockroach has normal haemolymph circulation, but its tracheoles fail to reach close to metabolically active muscle cells. The most likely consequence is:

45. Use the mouthpart arrangement described below. Structure P forms the upper boundary of the mouth. A pair of hard structures lies behind it and performs cutting and grinding. Paired manipulatory appendages occur laterally, while a median tongue-like structure projects centrally. The median structure is:

46. A specimen has clear metameres and normal anterior structures but lacks a prominent glandular band across segments . The observation most directly weakens the conclusion that the specimen is:

47. Assess the following statements about the cockroach abdomen and the female genital pouch.
I. Both male and female cockroaches have ten abdominal segments.
II. In the female, the seventh sternum is boat-shaped.
III. The seventh sternum, together with the eighth and ninth sterna, forms the genital pouch.
IV. The female genital pouch is formed entirely by the tenth tergum.

48. Assess the following statements about the ecological and human significance of frogs.
I. Frogs consume insects and may help protect crops.
II. Frogs participate in food chains and food webs.
III. Frog legs are consumed as food in some countries.
IV. Every frog species is harvested as food in all countries.

49. In a cockroach, organs are directly bathed by circulating haemolymph within body sinuses. This condition is characteristic of:

50. A cockroach normally has one pair of walking legs on each thoracic segment. If one mesothoracic leg is lost while all other legs remain intact, which description is correct?