Structural Organisation in Animals Mock Test – Class 11 Biology

1. 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.

2. Both antennae of a cockroach are damaged, while the compound eyes and flexible neck remain functional. The most likely immediate effect is:

3. Compare the two tissue samples shown below.

The most suitable identification is:

4. A treatment selectively suppresses secretion from the hepatic caeca of a cockroach but leaves the Malpighian tubules and hindgut functional. Which pattern is most likely?

5. The sinus venosus of a frog is correctly related to the heart as a structure that:

6. Examine the records describing cockroach oothecae.

The record requiring correction is:

7. Each testis of a male frog gives rise to vasa efferentia. For both testes together, the possible total number of vasa efferentia lies within:

8. The arrangement below is described in words. Structure P lies below the alimentary canal and bears repeated ganglia. Near the pharynx, paired branches rise around it and meet Structure Q above the canal. P and Q are, respectively:

9. Examine the segmental records below.

The record requiring correction is:

10. Assertion: Long bones contribute to movement as well as weight bearing.
Reason: Skeletal muscles attached to bones can apply pulling forces that move them at joints.

11. The nictitating membranes of a frog fail to move over the eyes, while vision in air remains initially normal. The most direct difficulty is:

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

13. Among fresh grass, a frog becomes greener, whereas in dry surroundings it appears more brownish. The most immediate adaptive value of this change is:

14. The amphibious-life records below are evaluated.

Which records are biologically consistent?

15. An earthworm is described as hermaphroditic. This classification means that one mature individual:

16. Assess the following statements about the liver, gall bladder, and pancreas of a frog.
I. The liver secretes bile.
II. The gall bladder stores bile.
III. The pancreas produces pancreatic juice containing digestive enzymes.
IV. Bile is produced by the gall bladder and stored in the liver.

17. Equal connective-tissue strips are treated selectively. Collagen is broken down in Strip P, while elastin is broken down in Strip Q. Both are pulled with the same force and then released. Which result best distinguishes the two fibre functions?

18. 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:

19. Rana tigrina is best identified as:

20. A sealed earthworm cocoon contains fertilised eggs and nutritive material. After about , small worms resembling the general adult body form emerge, and no distinct larva is observed. The developmental pattern is:

21. Assertion: Earthworm nephridia contribute to osmoregulation as well as excretion.
Reason: They help regulate the volume and composition of body fluids while conveying waste-containing fluid toward an outlet.

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

23. 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.

24. Review the statements given below about mosaic vision in a cockroach.
I. Each compound eye contains numerous ommatidia.
II. The combined image is described as a mosaic.
III. Mosaic vision has high sensitivity but comparatively lower resolution.
IV. This visual organisation is unsuitable for a nocturnal animal.

25. Examine the statements below about the frog brain.
I. The cerebral hemispheres are paired.
II. The diencephalon is unpaired.
III. The optic lobes are paired.
IV. The cerebellum is a paired component of the forebrain.

26. Which sequence places the listed earthworm reproductive landmarks from anterior to posterior?
P. Spermathecae in segments
Q. Testes in segments and
R. Ovaries near the septum between segments and
S. Female pore on segment
T. Male pores on segment

27. Blood glands in segments are selectively destroyed, while the hearts and vessels remain initially functional. The most direct expected change is:

28. 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:

29. Associate each connective-tissue component with the property to which it contributes most directly. Each Column II entry is used once.

30. Read the internal arrangement described below. Structure P is a thin-walled sac lying ventral to the rectum. It communicates with the common terminal chamber of the digestive, urinary, and reproductive systems. Structure P is:

31. 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:

32. A segment map shows an intact buccal cavity in segments and an intact oesophagus in segments , but the canal structure in segment is non-functional. The most direct consequence is:

33. Changing from green among grass to brown in dry surroundings reduces a frog's visual contrast with the background. Which interpretation best fits this protective effect while retaining the conventional wording associated with it?

34. Soil observations are summarised below.

The record requiring correction is:

35. Most setae of an earthworm are experimentally prevented from projecting out of their epidermal pits, while body-wall muscles remain active. The most likely effect is:

36. In Group P frogs, half of the nephrons in both kidneys are rendered non-functional, while renal blood flow and the ureters remain open. Group Q frogs have normal kidneys. Which prediction is best supported?

37. Two groups of four viable earthworm cocoons produce the following numbers of young.

Which conclusion is best supported?

38. Order the general stages of nephridial processing in an earthworm.
P. Waste-containing material is conveyed through the nephridial tubule.
Q. Excess coelomic fluid enters the nephridial funnel.
R. Material is discharged through an external pore or into the digestive tube.

39. Assertion: A female frog can retain normal urine conduction even when both oviducts are obstructed.
Reason: Female ureters and oviducts are separate ducts that open independently into the cloaca.

40. Examine the observations and provisional functions shown below.

Which samples require correction of their stated main functions?

41. Assertion: Hermaphroditism in an earthworm does not eliminate the biological importance of mating with another worm.
Reason: Two worms exchange sperm-containing reproductive material, and received sperm can be stored for later use during cocoon reproduction.

42. Relate each epithelial location with the most relevant structural feature and role. Each Column II entry is used once.

43. 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.

44. Secretory gland cells in the epidermis of an earthworm stop functioning, while the cuticle and both muscle layers remain structurally intact. The most immediate expected change is:

45. A preserved worm shows numerous transverse grooves dividing its long cylindrical body into repeated ring-like units from near the anterior end toward the posterior end. This observation provides the strongest external evidence for:

46. A lining consists of one cell layer and permits exchange across a cavity wall, whereas a second lining has several layers and resists repeated abrasion. The pair is best completed as:

47. A graph plots distance moved by mucus against time. Curve P rises steadily with normal ciliary beating. Curve Q remains nearly flat even though mucus production is doubled after cilia are immobilised. Which inference is strongest?

48. Use the orientation described below. Structure P is a compact triangular capsule containing fused segments. Its broad surface faces forward and downward, while a narrow flexible connection joins it to the next body region. Structure P is:

49. Associate each cockroach mouthpart with its principal role. Each Column II entry is used once.

50. Read the arrangement described below. Structure P is an elongated muscular tube lying dorsally through the thorax and abdomen. It is divided into funnel-shaped chambers, each receiving haemolymph through lateral openings. Structure P is: