Anatomy of Flowering Plants Mock Test – Class 11 Biology

1. A vessel element retains its lignified side walls and open pits, but its perforated end wall becomes completely sealed. The most immediate effect is:

2. An unknown section contains vascular bundles arranged in a ring. Within each bundle, phloem lies externally, xylem internally and a dividing cambial strip occurs between them. Protoxylem is nearest the pith. The evidence most strongly supports:

3. Xylem is composed of:

4. Three tissue samples from the same plant are tested.

The correct identification of P, Q and R is:

5. A section has differentiated cortex, medullary rays, central pith and vascular bundles arranged mainly in a ring with cambium between phloem and xylem. One damaged bundle appears closed and displaced inward. The most justified conclusion is:

6. Consider the following statements about vascular-bundle geometry.
I. In a radial arrangement, xylem and phloem occur on alternate radii.
II. In a conjoint arrangement, xylem and phloem lie along the same radius.
III. Every conjoint bundle is open.
IV. Radial or conjoint identity is independent of the exarch or endarch maturation description.

7. Vascular bundles from two regions of a monocot stem are examined.

The best interpretation is:

8. Two treatments are applied to comparable vascular regions. Treatment P suppresses companion-cell metabolism while leaving sieve plates intact. Treatment Q blocks tracheid and vessel lumens while leaving xylem parenchyma functional. P reduces food translocation, and Q reduces water movement. The results show that:

9. Match each vascular component with its most characteristic contribution. A Column II entry is used once.

10. Four xylem elements are described. Structure P is elongated and tapering with pitted walls. Structure Q is wide and joins similar cells through perforated end walls. Structure R is living and thin-walled. Structure S is narrow with a heavily lignified wall and mainly provides strength. Which paired interpretation is accurate?

11. Assertion: Apical meristem chiefly increases the girth of an older stem.
Reason: Apical meristem at root and shoot tips produces primary tissues that contribute to increase in length.

12. A transverse section has the following outer-to-inner pattern: a cutinised epidermis, collenchymatous hypodermis, cortical parenchyma, starch sheath, sclerenchymatous pericycle, ringed open vascular bundles separated by medullary rays and a central pith. Which change would most specifically make the section inconsistent with a typical young dicot stem?

13. A developmental series of sections gives the following evidence. In specimen P, the first-formed xylem is located at the outer tips of xylem strands. In specimen Q, the first-formed xylem lies next to the pith. The strongest inference is:

14. Match each structure with the most immediate effect of selective damage. A Column II entry is used once.

15. A graph plots vascular-bundle number per equal area against distance inward from the epidermis. Specimen P shows bundles only within a narrow peak corresponding to one ring. Specimen Q shows bundles across most distances, with no single ring-shaped peak. Which interpretation is best supported?

16. A viability stain is applied to an xylem strand. Only thin-walled cells arranged among the conducting elements and in short radial rows retain the stain; some contain stored starch. The stained cells are most likely:

17. Treatment P removes suberin specifically from root Casparian strips. Treatment Q prevents normal pectin-rich corner thickening in the collenchyma of a young petiole. Which paired result is expected?

18. Four concentric regions of a primary root are labelled.

Which adjacent pair lies on opposite sides of the cortex-stele boundary?

19. Vascular cambium and cork cambium are experimentally prevented from dividing, while apical and intercalary meristems remain functional. Which growth pattern is most likely?

20. Use the arrangement described below. A stem section has an outer epidermis, several layers of thick-walled dead cells beneath it and a broad internal parenchymatous region without distinct cortex, medullary rays or pith. Numerous vascular bundles occur within this region. The section is most consistent with:

21. Match each broad tissue function with the structure that most directly performs it. A Column II entry is used once.

22. Root P has xylem groups and alternating phloem patches. Root Q has xylem groups and alternating phloem patches. A stain labels xylem patches only. What percentage of the separately counted vascular patches is labelled in each root, and what does the comparison show?

23. A root of an aquatic flowering plant has unicellular root hairs, a broad cortex containing very large air spaces, a compact endodermis with Casparian strips, polyarch radial exarch vascular tissue and a large pith. The best integrated interpretation is:

24. Which preparation best reveals the principal spatial relations used to compare primary anatomy?

25. Four selective treatments are applied to different plant organs.
P. Chloroplast-rich thin-walled tissue between two leaf epidermises is destroyed.
Q. Dead lignified cells joined through perforated end walls are blocked.
R. Living enucleate conducting elements are disconnected from adjacent nucleated cells.
S. Large colourless adaxial epidermal cells of a grass leaf are kept permanently turgid during drought.
Which set of outcomes is fully consistent?

26. Cortex, pith, medullary rays and mesophyll are related most accurately as:

27. Four descriptions represent different organisational levels.
P. A group of cells of common origin cooperating in storage
Q. Epidermal, ground and vascular systems arranged as a root
R. Xylem and phloem organised as the conducting system
S. One elongated epidermal cell
Which classification is accurate?

28. Root P and stem Q contain regions both named pericycle.

Which interpretation is correct?

29. Palisade tissue beneath one surface and xylem facing the same surface are related as:

30. The epidermis of a young aerial stem loses its cuticle and most trichomes, while its stomata and internal tissues remain intact. The most likely direct consequence is:

31. Assertion: The sclerenchymatous sheath around each monocot-stem vascular bundle is vascular cambium and makes the bundle open.
Reason: The bundle sheath is a supporting boundary of sclerenchymatous cells surrounding the vascular bundle.

32. Conjunctive tissue in a root and medullary rays in a stem may both be parenchymatous. Their most reliable distinction is that:

33. Match each meristematic region with its most characteristic location and growth consequence. A Column II entry is used once.

34. In a typical isobilateral leaf, the mesophyll is best described as:

35. Consider the following statements about bulliform cells in a grass leaf.
I. They are enlarged cells of the adaxial epidermis.
II. They commonly occur in groups along the veins.
III. They are large, empty and colourless in appearance.
IV. They are chloroplast-rich cells forming the entire mesophyll.

36. Elongated cells are isolated from the cortex, a conducting strand and the epidermis of the same plant. Can their shared shape alone justify placing them in one tissue?

37. Xylem and phloem are related to the vascular tissue system in the same way that:

38. Arrange the following regions of a young dicot stem from the outside toward the vascular bundles.
P. Starch sheath
Q. Epidermis
R. Cortical parenchyma
S. Collenchymatous hypodermis
T. Sclerenchymatous pericycle

39. Palisade cells are selectively damaged in one half of a dorsiventral leaf, while the spongy mesophyll, epidermises and vascular bundles remain intact. Under identical illumination, the treated half shows reduced photosynthetic performance. The strongest inference is:

40. A vertical leaf section has an upper epidermis and a lower epidermis. Between them lies a broad region of living, thin-walled cells containing many chloroplasts. This internal region is:

41. Equal strips rich in tissues P and Q are tested. P is taken from a young petiole and bends repeatedly without permanent fracture. Q is taken from a hard seed coat, resists bending strongly and eventually snaps. Chemical examination detects heavy lignification only in Q. The best interpretation is:

42. The pericycle of a young dicot root is selectively destroyed, while the endodermis and existing vascular tissues remain intact. The most likely combined consequence is:

43. A graph has the proportion of closed stomata on the horizontal axis. The vertical axis shows the relative rates of stomatal gaseous exchange and stomatal water-vapour loss under otherwise unchanged conditions. Both curves decline as the proportion of closed stomata increases. The trend indicates that:

44. The following regions are compared in a young dicot stem.

Which interpretation is accurate?

45. In a typical monocot stem, two changes are introduced simultaneously: the sclerenchymatous bundle sheaths are softened, and functional cambium is inserted between phloem and xylem in every bundle. Which combined outcome is most likely?

46. Arrange the levels of organisation from the simplest unit to a complete plant organ.
P. Tissue system
Q. Cell
R. Organ
S. Tissue

47. Consider the following statements.
I. Organ-specific tissues such as root cortex and leaf mesophyll can belong to the same ground tissue system.
II. Cell viability, wall pattern and position can jointly predict tissue function.
III. Vascular geometry and xylem maturation orientation are separate anatomical classifications.
IV. One diagnostic feature is always sufficient to identify any root, stem or leaf section with certainty.

48. A young stem has a subepidermal band of living elongated cells with pectin-rich corner thickenings, but its internal ground tissue is undifferentiated and its vascular bundles are scattered and closed. Which interpretation is best?

49. Cells produced by a meristem stop dividing regularly, become elongated and develop wall features suited for mechanical support. After this change, they are best classified as:

50. Sample P consists of irregular lignified cells scattered through a soft fruit pulp and produces grittiness. Sample Q consists of very elongated, narrow lignified cells within a vascular strand and mainly reinforces the strand. Which identification is correct?