Anatomy of Flowering Plants Mock Test – Class 11 Biology

1. Bulliform cells are selectively destroyed in one group of grass leaves, while stomata, cuticle and vascular tissues remain functional. Under water stress, these leaves fail to roll normally and lose more water than controls. The most justified conclusion is:

2. Use the arrangement described below. Label P marks a group of unusually large, empty-looking cells in the upper epidermis directly above a vascular bundle. Label Q marks ordinary chloroplast-containing mesophyll beneath them. Label P identifies:

3. Consider the following statements about secondary-growth potential.
I. Cambium between phloem and xylem makes a vascular bundle open.
II. An open bundle has the capacity to produce additional vascular tissues.
III. Typical monocot-stem bundles are closed and lack ordinary bundle-cambium activity.
IV. The presence of cambium alone proves that extensive secondary vascular tissues have already accumulated.

4. Consider the following statements.
I. Dead lignified vessel elements and dead lignified sclerenchyma can perform different functions because their cellular organisation differs.
II. An organ may retain its anatomical identity after one diagnostic feature is experimentally altered if several independent relations remain intact.
III. Cambium presence affects open-closed status and secondary vascular potential but does not by itself determine radial-conjoint geometry.
IV. Stomata on both leaf surfaces prove isobilateral identity even when distinct adaxial palisade and abaxial spongy tissues are present.
V. Root and dicot-stem pericycles must have identical cell types and functions because they share one name.

5. Assertion: A reliable practical identification of a root or stem section should use several independent anatomical characters.
Reason: A single feature such as large pith, cambium absence or bundle abundance may support a diagnosis but can be insufficient without vascular geometry and tissue arrangement.

6. Two equal aquatic shoots remain alive under identical light and temperature. In treatment P, the large intercellular cavities of the petiole are experimentally filled with a harmless gel without blocking vascular bundles. Treatment Q is untreated. P shows reduced floating ability and slower internal gas movement. The strongest inference is:

7. Use the arrangement described below. Phloem lies toward the outer side of a vascular bundle, xylem lies toward the inner side, and a strip of actively dividing cells occurs between them. The bundle is classified as:

8. Assertion: In a typical dorsiventral leaf, spongy parenchyma lies immediately beneath the adaxial epidermis and palisade parenchyma lies near the abaxial epidermis.
Reason: Palisade tissue is normally adaxial, whereas spongy tissue with large air spaces lies farther toward the abaxial side.

9. Which combination correctly describes actively dividing meristematic cells?
I. Thin primary cell walls
II. Dense cytoplasm with prominent nuclei
III. A large central vacuole occupying most of each cell
IV. Negligible intercellular spaces

10. A botanist confirms that one specimen is a monocot root and another is a dicot root. Both contain epidermal, ground and vascular tissue systems, but their internal arrangements are not identical. Their relationship is best described as:

11. Trichomes are carefully removed from treatment shoots without damaging their cuticle, stomata or internal tissues. Control shoots retain the hairs. Under the same dry-air conditions, treatment shoots lose water more rapidly. The strongest inference is:

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

13. Medullary-ray cells are selectively destroyed in a young dicot stem, while the vascular bundles and pith remain intact. The most direct anatomical consequence is:

14. 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.

15. Two phloem components are compared.

The most accurate interpretation is:

16. Companion cells in treatment P lose nuclear and metabolic activity, but the walls and sieve plates of neighbouring sieve-tube elements remain initially intact. Treatment Q is unaffected. P later shows reduced translocation and deterioration of sieve-tube function. The strongest inference is:

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

18. A technician has labelled two surfaces of a dorsiventral-leaf section.

Which correction is required?

19. Assertion: Phloem parenchyma is absent from most typical monocot stems.
Reason: The vascular bundles of a typical monocot stem are closed because cambium is absent.

20. Four proposed diagnostic inferences are listed.

The only sufficiently supported proposal is:

21. 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:

22. 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:

23. Consider the following statements about the stele of a primary root.
I. It begins internal to the endodermis.
II. It includes the pericycle and vascular tissues.
III. The general cortex forms part of the stele.
IV. The pith, when present, is one component of the stele rather than the entire stele.

24. 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:

25. Equal young roots are grown under identical conditions. Root P retains normal root hairs, while root Q has its root hairs removed without damaging the remaining epidermis or internal vascular tissues. Q absorbs less water and mineral solution. The observation supports the inference that:

26. In an isolated stem segment, a treatment blocks the lumens of tracheids and vessels but leaves xylem fibres and xylem parenchyma alive or structurally intact. Compared with an untreated segment, upward water movement falls sharply, while storage and much mechanical strength remain. The results show that:

27. An unknown section has an epiblema, broad cortex, endodermis, pericycle, radial exarch vascular tissues, xylem groups and a large pith. The most appropriate completion is: the specimen is a ______.

28. Sections P and Q are observed over an extended growth period. P initially has radial xylem groups and a small pith, then develops a cambial ring and additional vascular tissues. Q has radial xylem groups and a large pith but shows no comparable cambial activity. The strongest inference is:

29. Which statement is a direct microscopic observation rather than an anatomical inference?

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

Which interpretation is accurate?

31. A narrow ring of tissue is selectively damaged. Upward movement of water continues, but movement of sugars from photosynthetic leaves to a storage organ falls sharply. Living storage cells and dead supporting fibres are also found in the damaged region. The affected tissue is most likely:

32. A vascular-tissue analysis gives the following observations.

Which interpretation is most consistent with the data?

33. A labelled reference slide is a dorsiventral leaf. An unknown leaf has the same adaxial xylem and abaxial phloem orientation, but it also has stomata on both surfaces, undifferentiated mesophyll and adaxial bulliform cells. The strongest conclusion is:

34. A vascular sample contains sieve-tube elements, companion cells and thick-walled phloem fibres, but no phloem parenchyma. The best classification is:

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

The best interpretation is:

36. 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:

37. A transverse section has a collenchymatous hypodermis, starch sheath, sclerenchymatous pericycle and vascular bundles arranged in a ring with cambium and endarch xylem. A large cavity occurs at the exact centre of the section, outside all vascular bundles. Which interpretation is most accurate?

38. A young root is experimentally coated with a continuous waxy layer while its internal vascular tissues remain undamaged. Compared with an untreated root, the coated root is expected to show:

39. A mature supporting tissue contains cells with heavily lignified walls, pits, narrow internal cavities and no living protoplasts. It is identified as:

40. Match each tissue system with the description that identifies it most accurately. A Column II entry is used once.

41. Xylem is selectively blocked in several leaf veins, while phloem remains functional. Which effect is expected most directly in the tissues supplied by those veins?

42. 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:

43. Use the arrangement described below. Layer P is the outermost root layer and produces unicellular hairs. Region Q contains several layers of thin-walled cells with intercellular spaces. Layer R is the compact innermost cortical layer. Layer S lies immediately inside R. The correct identification is:

44. Assertion: An open vascular bundle has the capacity to form secondary vascular tissues.
Reason: The sclerenchymatous sheath surrounding a bundle is vascular cambium.

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

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

47. Two innermost cortical layers are tested.

Which interpretation is correct?

48. Let , and represent the epidermal, ground and vascular tissue systems. Let be root cortex, stem pith, leaf mesophyll and , , xylem in root, stem and leaf respectively. Which relation is correct?

49. Equal areas from the two epidermal surfaces of a leaf are examined. Both show abundant functional stomata. The internal mesophyll remains undifferentiated, and no treatment has altered stomatal development. The strongest inference is:

50. A transverse section shows xylem and phloem on alternate radii. Within each xylem strand, smaller protoxylem elements occur toward the periphery and larger metaxylem elements toward the centre. This combination indicates: