Morphology of Flowering Plants Mock Test – Class 11 Biology

1. Match each reproductive or vegetative axis with its correct identity. Each Column II entry is used once.

2. The relevant positions are described below. In Flower P, the petals form one continuous corolla tube but retain separate lobes at the top. In Flower Q, every petal is free from its base to its tip. P and Q are:

3. Assertion: A phylloclade can replace reduced foliage leaves as the major photosynthetic organ in some arid plants.
Reason: A cladode is a green branch of limited growth that also performs photosynthesis.

4. Assertion: The ovary, rather than the entire gynoecium, is identified as the usual direct precursor of the fruit.
Reason: The gynoecium may also include the stigma and style in addition to the ovary.

5. Assess the following statements about basal placentation.
I. The placenta occurs at the base of the ovary.
II. A single ovule is commonly borne on the basal placenta.
III. Sunflower and marigold provide standard examples.
IV. Septa connect the ovary wall with a central ovule-bearing axis.

6. A plant has opposite phyllotaxy at successive nodes. Every leaf is pinnately compound with leaflets, and each complete leaf subtends one axillary bud. What is the ordered pair representing total axillary buds and total leaflets?

7. A dry fruit develops from a bicarpellary syncarpous superior ovary with parietal placentation and a false septum. It belongs to the characteristic Brassicaceae fruit category:

8. Four herbaceous specimens are compared.

Which specimen is most compatible with Brassicaceae?

9. Evaluate the statements about a seed.
I. It normally develops from a fertilised ovule.
II. It contains a seed coat and an embryo.
III. The embryo includes an embryonal axis with radicle and plumule.
IV. Every seed necessarily possesses two cotyledons.

10. Four family patterns are represented below.
P: , with axile placentation
Q: , with parietal placentation
R: , with marginal placentation
S: , with basal placentation
Which relation is correct?

11. A dissection reveals the following organisation. The thalamus grows around the ovary and fuses with its wall. Sepals, petals and stamens appear to arise above the ovary. This flower is:

12. A unilocular ovary contains a single ovule near its centre, but the available transverse section does not show the point of attachment. Which observation most decisively distinguishes free-central from basal placentation?

13. Assertion: Cactus spines are classified as modified leaves.
Reason: Their pointed form provides protection and their reduced surface helps limit water loss.

14. A plant growing in waterlogged soil produces roots that project upward above the muddy surface. If the soil becomes severely oxygen-poor, these roots are advantageous mainly because they:

15. Two underground specimens are divided into comparable segments. Segments of P bearing regularly spaced buds produce new shoots; P also has nodes and internodes. Q has an apical root cap, a root-hair-bearing region and no nodes. The strongest conclusion is:

16. Assertion: Removing the terminal flower from an already established cyme does not convert the inflorescence into a raceme.
Reason: Cymose identity reflects a developmental history in which the main apex became a flower, not merely the continued physical presence of that terminal flower.

17. Arrange the following sections of a semi-technical plant description in the correct order.
P. Inflorescence
Q. Root
R. Fruit and seed
S. Habit
T. Stem and leaves
U. Flower and its whorls

18. An aquatic plant forms normal offset branches and daughter rosettes, but root development below each rosette is prevented. After the offsets detach, the most likely result is:

19. Assertion: A capsule fruit alone cannot reliably distinguish Solanaceae from Malvaceae.
Reason: Both families may produce capsules, but they differ strongly in corolla fusion, stamen organisation and carpel number.

20. A dry fruit has a thin, nearly uniform wall in which three visibly distinct layers cannot be separated. Which interpretation is correct?

21. Three shoots have the following nodal arrangements.

The correct classification is:

22. Which pair of relations correctly represents both an organ boundary and developmental products?

23. In a cactus, leaf spines are experimentally replaced by broad, thin laminae, while the green stem continues photosynthesis at its original rate. Under dry conditions, the most likely combined effect is:

24. A treatment selectively disables the elongation region of a root while leaving the meristematic region functional and existing root hairs temporarily intact. The most likely early result is:

25. Evaluate the statements about carpel fusion.
I. Free carpels form an apocarpous gynoecium.
II. Fused carpels form a syncarpous gynoecium.
III. Lotus and rose provide examples of apocarpy.
IV. Mustard and tomato provide examples of syncarpy.

26. Examine the following specimens.

The correct count and interpretation of whole leaves are:

27. Comparable stolons are cut from their parent plants at two stages. Group P is detached before the arched branch touches soil, whereas Group Q is detached after the contact point has formed adventitious roots and a daughter shoot. Which outcome is most likely under otherwise suitable conditions?

28. In an Australian Acacia leaf, the normal lamina becomes greatly reduced, while the petiole expands into a flattened green structure that carries out photosynthesis. This expanded petiole is a:

29. Two plants share the typical Solanaceae flower: five united persistent sepals, five united valvate petals, five epipetalous stamens and a superior bicarpellary axile ovary. Plant P bears solitary flowers in leaf axils, while Plant Q bears flowers in cymose clusters. Which interpretation is correct?

30. A Hibiscus flower bears a ring of narrow green structures outside the calyx. These structures form the:

31. A grass mutant forms normal culms, spikelets, lodicules, three stamens and a superior one-ovulate ovary. At maturity, however, the fruit wall separates readily from the seed coat. Which conclusion is most accurate?

32. Sample P contains Brassicaceae flowers, each with . Sample Q contains Solanaceae flowers, each with . How do their total stamen counts compare?

33. Four monocot specimens have the following features.

Which specimen is most consistent with Poaceae?

34. Three leaves show the following basal structures.

The most accurate interpretation is:

35. Assess the following statements about floral descriptors.
I. Ovary position is determined by the relationship between the gynoecium, thalamus and insertion of other whorls.
II. Actinomorphic symmetry does not by itself establish whether an ovary is superior or inferior.
III. Every epigynous flower must be unisexual.
IV. A pentamerous flower may show different ovary positions depending on its insertion pattern.

36. Evaluate the statements about a typical Fabaceae flower.
I. It is bisexual, zygomorphic, pentamerous and hypogynous.
II. Its corolla is papilionaceous and shows vexillary aestivation.
III. Ten stamens are commonly arranged in a diadelphous pattern.
IV. Its gynoecium is usually bicarpellary and syncarpous.

37. Match each grass-leaf structure with its correct description. Each Column II entry is used once.

38. Evaluate the statements about the transition from a vegetative shoot to a floral structure.
I. The shoot apical meristem may become a floral meristem.
II. The floral axis commonly becomes condensed.
III. Ordinary foliage leaves are replaced by specialised floral appendages.
IV. Continued production of long vegetative internodes is essential for every flower.

39. Assertion: Sweet potato is classified as an adventitious root solely because it stores reserve food.
Reason: Adventitious roots are identified by their origin from plant parts other than the radicle, independently of their specialised function.

40. Flower P has a cup-shaped thalamus surrounding the ovary without fusing to it, and the calyx, corolla and stamens arise from the cup rim. In Flower Q, the thalamus encloses and fuses with the ovary, and the other whorls arise above it. P and Q are:

41. Three groups of flower buds are observed. Group P receives normal pollen and forms seeded fruits. Group Q is protected from pollen and its ovaries do not enlarge. Group R is protected from pollen but receives Treatment X and forms normal-sized seedless fruits. Which conclusion is best supported?

42. Root formation at the nodes of a runner is experimentally blocked, while stem elongation and axillary-bud activity remain normal. The most likely outcome is:

43. In a longitudinal view of a root tip, Region P covers the extreme apex, Region Q contains small actively dividing cells, Region R contains rapidly lengthening cells, and Region S bears numerous delicate root hairs. Region S is identified as:

44. If the maturation region of a young root is selectively damaged while the meristematic and elongation regions remain functional, the earliest major effect will be:

45. Equal intervals are marked along a young root. After further growth, the intervals in a band just above the actively dividing region have increased greatly, whereas intervals in the root-hair-bearing region show little separation. The strongest inference is:

46. A floating plant produces compact daughter rosettes on short horizontal branches. Each branch has a single conspicuous internode, with leaves above and a root tuft below the daughter rosette. Which feature most strongly identifies the branch as an offset rather than a runner?

47. Which combination of corolla characters is structurally consistent?

48. An older herbarium register lists Cruciferae, Leguminosae, Compositae and Gramineae in that order. Which sequence gives their accepted equivalent family names?

49. Assertion: In a perigynous flower, the ovary is treated as half-inferior.
Reason: The gynoecium lies centrally while the other floral whorls arise from the rim of a cup-shaped thalamus at approximately the same level.

50. A shoot apex stops producing ordinary foliage leaves, its axis becomes highly condensed, and floral appendages arise successively around the apex. The observations support the conclusion that a flower is: