Morphology of Flowering Plants Mock Test – Class 11 Biology

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

2. A zygomorphic floral diagram is copied without the mother-axis and bract markers and is then rotated. Member number, fusion and the single symmetry plane remain visible. Which information becomes most uncertain?

3. Four structures from a sunflower head are described below.

The correct identification is:

4. 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.

5. A botanist compares plants of one species grown in shade and open sunlight. Leaf size varies between the environments, but node position, bud arrangement and floral organisation remain consistent. Which conclusion best reflects the scope of morphology?

6. 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.

7. A shoot apex is removed after several leaf primordia have formed. Existing young leaves continue expanding, but no new leaf primordia or higher nodes appear. The treatment most directly interrupted:

8. Evaluate the statements about hypogynous flowers.
I. The other floral whorls arise below the gynoecium.
II. The ovary is described as superior.
III. Mustard, china rose and brinjal provide standard examples.
IV. The thalamus encloses and fuses with the ovary wall.

9. Mean flower age is plotted against position on an inflorescence axis, where position is the base and position is the apex. Graph P shows age decreasing from base to apex. Graph Q shows age increasing toward the terminal region. Which pairing is most appropriate?

10. In a pea plant, all axillary buds are removed without damaging the leaves. Slender tendrils still develop from terminal parts of the compound leaves, while no new branches arise from the treated axils. The observation most strongly indicates that pea tendrils:

11. Assess the following statements about a typical angiosperm flower.
I. Floral parts are borne on the thalamus or receptacle.
II. Calyx forms the outermost principal whorl.
III. Androecium and gynoecium are reproductive whorls.
IV. The usual succession from outside inward is calyx, corolla, androecium and gynoecium.

12. Numerous stamens in a flower have their filaments united into a single tube around the style, and each anther has only one lobe. The stamens are:

13. Arrange the following grass-leaf regions from the culm outward toward the tip of the leaf.
P. Blade
Q. Sheath
R. Ligule at the junction

14. In a leaf blade, Structure P is the prominent median vein, Q and S are larger branches extending from it, and R consists of their finest subdivisions. P and R are respectively:

15. Use the coconut arrangement described below. A thin outer covering surrounds a thick fibrous husk. Beneath the husk lies a hard shell enclosing the seed. The fibrous husk and hard shell are respectively:

16. Assertion: Androecium and gynoecium are called reproductive floral whorls.
Reason: They contain structures directly associated with male and female reproductive functions.

17. Stamens are attached to the petals of a flower, while the filaments remain free from one another. This condition represents:

18. Review the statements concerning perigynous flowers.
I. The gynoecium lies in the central region of a cup-like thalamus.
II. Other floral whorls arise from the rim of the thalamic cup.
III. The ovary is treated as half-inferior.
IV. The thalamus completely encloses and fuses with the ovary wall.

19. 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?

20. Aestivation refers to:

21. Match each maize structure with its correct relation. Each Column II entry is used once.

22. A damaged flower has lost its corolla, but five anthers remain united into a tube while their filaments are free. The ovary is inferior, unilocular and contains one basal ovule, and a pappus is present. The family is:

23. Arrange the following events in the development of a simple cymose inflorescence.
P. Younger lateral flowers develop below the terminal flower.
Q. The terminal meristem changes into a flower.
R. Further elongation of the main axis through its apex stops.

24. Review the statements concerning the usual post-fertilisation changes in a flower.
I. The ovary develops into the fruit.
II. Ovules develop into seeds.
III. The entire gynoecium must be described as becoming the fruit.
IV. Seed number may reflect the number of ovules that develop successfully.

25. A longitudinal section of a pea ovary shows one carpel. The placenta forms a ridge along the ventral suture, and ovules occur in two rows on this ridge. The placentation is:

26. Two unknown flowers have superior ovaries and occur in racemose inflorescences. Which character pair most efficiently identifies one of them as Brassicaceae rather than Fabaceae?

27. Insectivorous plants growing in nitrogen-poor soil are divided into two groups under equal light, water and carbon dioxide. Group P receives insects containing labelled nitrogen, while Group Q cannot capture insects. Labelled nitrogen later appears in the tissues of P, and P grows better, but both groups remain green. Which inference is best supported?

28. Assess the following statements about evidence used to identify plant organs.
I. Nodes and buds can establish stem identity even when an organ is underground.
II. An axillary bud occurs at the base of a whole leaf rather than at the base of each leaflet.
III. The ovary develops into the fruit, while ovules develop into seeds.
IV. A modified organ retains its developmental identity even when it acquires a new function.

29. 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:

30. Which combination correctly describes the typical Fabaceae gynoecium?

31. A specimen shows the following arrangement. Structure P is a jointed grass stem. Region Q forms a solid transverse level from which a leaf and branch may arise, while Region R extends between two successive Q regions and is commonly hollow. Q and R are respectively:

32. A developmental defect prevents one member of each leaf pair from expanding, but paired leaf scars remain visible at every node. The shoot may appear to bear one leaf per node. The original phyllotaxy should still be classified as:

33. An underground shoot has a short stem disc bearing fleshy scale leaves and a terminal bud. Its aerial flower is trimerous, has an undifferentiated perianth, stamens attached to the tepals and a superior tricarpellary syncarpous ovary. Which statement is incorrect?

34. 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.

35. The stigma of a flower is removed before it can receive pollen, while the ovary, style and all stamens remain structurally intact. The function most directly lost is:

36. A dissected stamen has a slender stalk P ending in a bilobed structure Q. Each lobe of Q contains two pollen sacs. P and Q are respectively:

37. Two specimens have the following floral characters.

P and Q belong respectively to:

38. Match each floral-formula symbol with the structure it represents. Each Column II entry is used once.

39. Arrange the following developmental events in the formation of a typical flower.
P. Floral appendages differentiate into specialised whorls.
Q. A vegetative shoot meristem changes into a floral meristem.
R. The floral axis remains condensed because its internodes elongate very little.

40. Eye-bearing and eye-free pieces are cut from the same potato tuber and adjusted to contain equal stored food. Nodal and budless internodal pieces are also cut from one rhizome. Only the eye-bearing tuber pieces and nodal rhizome pieces produce new shoots. Which conclusion is best supported?

41. Four flower buds are recorded below.

The correct sequence is:

42. A specimen shows the following arrangement. Twelve stamens occur in a flower. Their filaments are united into four distinct clusters, while the anthers remain individually recognisable. The androecium is:

43. A temperate-region herb has alternate exstipulate leaves, five united valvate petals, five epipetalous stamens and a superior bicarpellary ovary with axile placentation. A collector rejects Solanaceae solely because the plant was not found in a tropical region. Which evaluation is correct?

44. Leaf P has smaller veins that repeatedly interconnect to form a network. In Leaf Q, the principal veins run beside one another through most of the blade without forming such a network. P and Q show:

45. A pea flower has ten stamens arranged as . Which interpretation is correct?

46. Two green flattened structures replace ordinary foliage function. P bears many nodes, internodes, scale leaves and flowers. Q develops from an expanded petiole after the lamina is reduced and bears no nodes of its own. P and Q are respectively:

47. Which interpretation of is correct?

48. Match each plant with the characteristic aestivation of its corolla. A Column II entry may be reused.

49. The notation most directly indicates:

50. Which formula is most consistent with the typical Solanaceae flower?