Anatomy of Flowering Plants Mock Test – Class 11 Biology

1. Palisade and spongy mesophyll are compared below.

The correct interpretation is:

2. 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.

3. Four regions of a young organ are selectively disturbed.

Which paired inference is best supported by the data?

4. Two plant sections contain conspicuous intercellular spaces. Section P is from an aquatic petiole and has thin-walled living cells enclosing very large interconnected air cavities. Section Q is from the lower mesophyll of a dorsiventral leaf and has loosely arranged chloroplast-bearing cells connected with stomatal air spaces. Which interpretation is most accurate?

5. A lignin-sensitive stain is applied to two unknown sections. Section P shows strongly stained sheaths around numerous complete bundles scattered through ground tissue. Section Q shows strongly stained xylem arms alternating with phloem patches around a small pith. Which evaluation is most accurate?

6. 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.

7. Cambium in a conjoint open vascular bundle is selectively destroyed while xylem and phloem remain functional. The most likely long-term consequence is:

8. 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.

9. Bundle diameters are measured in a monocot-stem section.

Using the mean diameter for each region, the data show that:

10. A surface projection remains continuous with one epidermal cell, contains no cross wall separating it into several cells and extends into the surrounding soil. It is classified as:

11. 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.

12. A leaf section is accidentally rotated during microscopy. Label P points to the side of a vascular bundle containing xylem, and label Q points to the side containing phloem. Palisade tissue lies on the same side as P. The biological orientation is:

13. Vascular bundles from an isobilateral leaf with parallel venation are compared.

Which inference best integrates the observations?

14. Consider the following statements about a typical monocot stem.
I. Its hypodermis is commonly sclerenchymatous.
II. Its ground tissue is generally not differentiated into distinct cortex and pith.
III. Its vascular bundles form a single ring around a central pith.
IV. Numerous vascular bundles occur throughout the ground tissue.

15. Assertion: Aerenchyma is chiefly a photosynthetic tissue identified by densely packed chloroplasts.
Reason: Its large intercellular air spaces aid gaseous exchange and can contribute to buoyancy in aquatic plants.

16. A grass-leaf section shows stomata on both surfaces, bulliform cells adaxially and numerous similarly sized bundles along parallel veins. A small compressed area of mesophyll appears columnar, but the undamaged regions show no palisade-spongy separation. The best interpretation is:

17. A unicellular extension from a root surface and a usually multicellular hair from a shoot surface are related as:

18. 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?

19. A stem bundle contains sieve-tube elements, companion cells and phloem fibres but lacks phloem parenchyma. It is enclosed by a sclerenchymatous sheath and lies among many scattered bundles. This combination supports identification as:

20. Assertion: A typical monocot root possesses an endodermis and a pericycle.
Reason: A monocot root lacks a pericycle since it does not ordinarily undergo secondary growth.

21. 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:

22. Two tissues are compared.

The most accurate interpretation is:

23. Arrange the following steps from xylem development to anatomical classification.
P. The positions of the first-formed and later-formed xylem are compared in a mature section.
Q. Protoxylem differentiates first.
R. Metaxylem differentiates later.
S. The xylem is identified as exarch or endarch.

24. Match each xylem component with its most characteristic role or feature. A Column II entry is used once.

25. Match each feature with the stem type in which it is most characteristic. A Column II entry may be reused.

26. In a leaf, region P consists mainly of chloroplast-bearing parenchymatous cells, while region Q contains tracheids, vessel elements, fibres and living parenchyma. Which classification is accurate?

27. Consider the following statements about vascular bundles in a typical young dicot stem.
I. They are arranged in a ring.
II. Each bundle is conjoint.
III. Cambium lies between phloem and xylem.
IV. Protoxylem lies toward the pith.

28. Equal areas of a dorsiventral leaf contain stomata on the adaxial surface and on the abaxial surface. All pores initially have the same open area. During water stress, all adaxial stomata remain open but of abaxial stomata close completely. What percentage of the initial total stomatal pore area remains open?

29. The most accurate relationship between dorsiventral and isobilateral leaves is that:

30. 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:

31. Equal-area samples contain two types of epidermal appendages. Sample P has unicellular projections from a root, each adding of surface area. Sample Q has branched multicellular projections from a shoot, each adding . Which conclusion is correct?

32. 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:

33. 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.

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

35. Consider the following statements about xylem components.
I. Tracheids and vessel elements are dead at functional maturity.
II. Xylem fibres are generally lignified and mechanical.
III. Xylem parenchyma is living and can store substances.
IV. Every xylem component is specialised primarily for axial water conduction.

36. Assertion: The stomatal apparatus is broader in composition than the stomatal pore alone.
Reason: It includes the pore, its two guard cells and the surrounding subsidiary cells where present.

37. 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?

38. Evaluate the statements about open and closed vascular bundles.
I. An open vascular bundle contains cambium between phloem and xylem.
II. Cambium gives an open bundle the capacity to form secondary vascular tissues.
III. A closed vascular bundle lacks cambium.
IV. The terms open and closed describe whether the bundle is exposed at the plant surface.

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

40. Match each structure with its tissue system and organ-specific context. A Column II entry is used once.

41. In section P, protoxylem lies from the centre and metaxylem lies from the centre. In section Q, protoxylem lies from the centre and metaxylem lies from the centre. P has radial vascular tissue, while Q has conjoint bundles. Which classification is correct?

42. The following observations were recorded from two vascular tissues.

Which interpretation integrates all the observations?

43. Consider the following statements about shoot trichomes.
I. They are usually multicellular.
II. They may be branched or unbranched and soft or stiff.
III. Some trichomes are secretory.
IV. Every trichome has the same structure and functions mainly in soil absorption.

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. Match each changed condition with the most likely immediate outcome. A Column II entry is used once.

46. A stable lineage label is introduced separately into pericycle cells and conjunctive-tissue cells of a young dicot root. Later, both labels occur in parts of the developing cambial region, but only the pericycle label occurs in lateral-root primordia. Which conclusion is best supported?

47. Three mature primary sections are examined. Specimen P has alternating xylem and phloem patches with peripheral protoxylem. Specimen Q has ringed conjoint bundles with protoxylem toward the pith. Specimen R has conjoint bundles in which xylem faces a palisade-bearing surface and phloem faces a stomata-rich surface. The correct interpretation is:

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

49. A tracer is introduced into all tissues immediately internal to the endodermis of a root section. It labels the pericycle, conjunctive tissue, xylem, phloem and central pith but not the cortex. 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: