Anatomy of Flowering Plants Mock Test – Class 11 Biology

1. Cambial cells between phloem and xylem in a young dicot stem are marked during division. New vascular derivatives later appear on both sides of the marked region. Which conclusion is justified?

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

The best interpretation is:

3. A stomatal preparation shows each pore surrounded by two dumb-bell-shaped guard cells. The preparation most likely came from:

4. Equal central areas of two young stem sections are compared.

Which interpretation is best supported?

5. Pericycle cells are marked with a stable lineage label in a young dicot root. Later, labelled cells occur in developing lateral-root primordia and in part of the newly organised cambial region, while endodermal cells remain unlabelled. The strongest inference is:

6. Match each stomatal component with its defining description. A Column II entry is used once.

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

8. 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

9. A prepared dicot-root section is rotated and its outer edge is accidentally hidden. The observer can still see alternating xylem and phloem patches, peripheral protoxylem within each xylem strand and a small pith. The most reliable conclusion is:

10. Four observations are recorded from growing regions.

Which observation most specifically supports the presence of an intercalary meristem?

11. A typical monocot root retains a normal epiblema, cortex, endodermis, pericycle and polyarch radial vascular system, but no functional cambial ring develops. Over time, it is expected to:

12. Cells between xylem and phloem are exposed to a marker incorporated only during cell division. Bundle P shows many labelled intervening cells and later produces additional vascular tissue. Bundle Q shows no intervening labelled cells and produces no such tissue. The most justified inference is:

13. Cells between phloem and xylem in stem bundles are supplied with a division marker. Marked cells later produce new vascular derivatives on both sides, while neighbouring differentiated conducting cells remain unlabelled. The most justified conclusion is:

14. Xylem is composed of:

15. Four regions from primary plant organs are described.

Which classification correctly integrates the observations?

16. In a young dicot stem, the living corner-thickened cells of the hypodermis prematurely become dead and uniformly lignified, while the epidermis and vascular bundles remain intact. During continued elongation, the most likely change is:

17. Which comparison of vascular-bundle sheaths is most accurate?

18. A longitudinal arrangement shows stacked cells that lack nuclei at maturity but retain living cytoplasm. Their end walls form sieve plates. Each stacked cell lies beside a nucleated cell connected to it by plasmodesmata. The functional relationship is:

19. 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?

20. 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?

21. 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?

22. Let and represent the radii occupied by xylem and phloem, and let represent the presence of cambium, where means present and means absent. A typical monocot-stem bundle is represented by:

23. The vascular bundles of an otherwise typical monocot stem remain scattered, but each bundle develops a functional cambial strip between phloem and xylem. The most accurate prediction is:

24. A graph has bulliform-cell relative water content on the horizontal axis and inward leaf curvature on the vertical axis. The curve is highest at low relative water content and declines as bulliform-cell water content rises. The trend indicates that:

25. The epidermal layer is missing from one margin of a dorsiventral-leaf section. Which remaining combination most reliably identifies that margin as abaxial?

26. Assertion: A typical closed vascular bundle has little capacity for ordinary secondary vascular-tissue formation from within the bundle.
Reason: A closed bundle lacks vascular cambium between its xylem and phloem.

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

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

28. A graph plots stomatal density for the two surfaces of an unknown leaf. The abaxial bar is much taller than the adaxial bar. A second observation shows a distinct palisade layer immediately beneath the adaxial epidermis. Together, the observations most strongly indicate:

29. Arrange the following events during water stress in a grass leaf.
P. The exposed leaf area decreases.
Q. Bulliform cells lose turgidity.
R. The leaf rolls inward.
S. Water availability to the bulliform cells declines.

30. Let represent protoxylem and represent metaxylem. The pair of outer-to-inner relations that correctly represents exarch root xylem followed by endarch stem xylem is:

31. Match each ground-tissue region with its characteristic position or role. A Column II entry is used once.

32. Enzymatic removal of much of the pectin and hemicellulose from a subepidermal collenchymatous band leaves the cells alive but weakens their corner thickenings. The affected young stem would most likely show:

33. In a transverse section, an unlabeled region includes the cortex and pith but excludes both the epidermis and every vascular bundle. By tissue-system classification, the region belongs to the [blank] system.

34. A student identifies an unknown root as monocot after observing only a large central pith. No xylem count or information about secondary-growth potential is available. The evaluation that best respects the evidence is:

35. Match each tissue or cell type with its characteristic feature. A Column II entry is used once.

36. Arrange the following decisions in a defensible sequence for identifying the vascular pattern of an unknown primary section.
P. Determine whether xylem and phloem share a radius or alternate.
Q. Identify the first-formed xylem from its position.
R. Classify the arrangement as radial or conjoint.
S. Combine vascular geometry and maturation with other organ features.

37. Bundle cross-sectional areas are measured in three veins of the same dorsiventral leaf.

If bundle size broadly follows vein hierarchy, P, Q and R most reasonably represent:

38. The shoot apex of a young plant is removed, but several healthy axillary buds remain. The most likely outcome is:

39. Three vascular arrangements are recorded.

Which classification correctly interprets all three arrangements?

40. In a correctly oriented vascular bundle of a typical dorsiventral leaf, xylem lies toward the [blank] surface and phloem lies toward the [blank] surface.

41. Assertion: Radial vascular organisation and exarch xylem together strongly support root identity.
Reason: In a typical primary root, xylem and phloem occupy alternate radii and protoxylem lies toward the periphery.

42. A student examining an unknown transverse section records only three observations: numerous complete vascular bundles, cambium absent from each bundle and a sclerenchymatous sheath around every bundle. Bundle distribution was not recorded. Which conclusion is strongest?

43. Assertion: Mature sieve-tube elements are the only dead cells present in phloem.
Reason: Phloem fibres are generally dead sclerenchymatous cells, whereas mature sieve-tube elements remain living although they lack nuclei.

44. Assertion: Parallel venation requires every vascular bundle in the lamina to have exactly the same dimensions.
Reason: Many bundles are nearly similar in size, but principal veins may contain larger bundles.

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

46. Consider the following statements about a typical monocot-stem vascular bundle.
I. Xylem and phloem lie along the same radius.
II. Cambium is absent between xylem and phloem.
III. The bundle is classified as conjoint and closed.
IV. Ordinary secondary vascular-tissue formation from bundle cambium is expected.

47. Arrange the events leading to formation of a protoxylem lacuna in a monocot-stem bundle.
P. A cavity remains in the protoxylem region.
Q. Protoxylem elements differentiate early.
R. The surrounding stem continues to develop.
S. Some early protoxylem elements break down.

48. A text-described section contains two regions. Region P has small, closely packed, thin-walled cells with dense cytoplasm, prominent nuclei and almost no intercellular spaces. Region Q has larger cells with stable specialised shapes and conspicuous vacuoles. The most defensible identification is:

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

50. Consider the following statements about tracheids and vessel elements.
I. Tracheids are elongated cells with tapering ends and pitted lignified walls.
II. Vessel elements form wider tubes through end-to-end arrangement and perforated end walls.
III. Both cell types are dead at functional maturity and conduct water.
IV. Lignified walls occur in vessel elements but not in tracheids.