Morphology of Flowering Plants Mock Test – Class 11 Biology

1. In Leaf P, all leaflets arise from one point at the petiole tip. In Leaf Q, leaflets arise at different positions along an elongated rachis. Experimental shortening of Q’s rachis brings its leaflets closer together but does not change their original attachment sites. Which conclusion is correct?

2. A specimen shows the following arrangement. Structure P consists of roots descending vertically from large horizontal branches and entering the soil. Structure Q consists of roots arising from lower stem nodes and growing obliquely into the soil. P and Q are respectively:

3. In a cucumber flower, a developmental alteration prevents thalamic enclosure of the ovary and shifts the calyx, corolla and androecium to positions below it. Assuming all floral whorls remain present, the altered flower would most closely become:

4. A leaf remains green, but many of its major veins are mechanically severed while the petiole and leaf base remain attached. The most direct combined effect is expected to be:

5. An unknown plant has a compound leaf whose terminal leaflet is modified into a tendril. An axillary bud occurs only at the base of the whole leaf. Its flower has a standard, two wings and two keel petals, ten stamens arranged as , and a superior monocarpellary ovary with marginal placentation. Which conclusion is correct?

6. 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.

7. 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?

8. Assertion: A grass spikelet should not automatically be counted as one flower.
Reason: One spikelet may contain several florets enclosed collectively by basal glumes.

9. A stem has nodes with alternate phyllotaxy, another has nodes with opposite phyllotaxy, and a third has nodes bearing leaves per whorl. Assuming no leaves are lost, the total number of leaves is:

10. 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:

11. Assertion: Vexillary aestivation is not identified merely by the presence of overlapping petals.
Reason: It requires a particular hierarchy in which the standard overlaps the wings and the wings overlap the keel petals.

12. Arrange the differentiated layers of a thick fleshy pericarp from the fruit surface toward the seed.
P. Endocarp
Q. Epicarp
R. Mesocarp

13. Assertion: The rachis of a pinnately compound leaf corresponds to the midrib of an undivided leaf.
Reason: The leaflets of a pinnately compound leaf are attached at different positions along this common axis.

14. A plant possesses a persistent primary root with numerous nodules. Its leaves are compound, stipulate and attached through swollen pulvini. Which additional observation would most strongly support Fabaceae identification?

15. Which interpretation of is correct?

16. Five petals in a flower bud are united at their bases to form a short corolla tube. Their free lobes meet edge to edge without overlapping. Which paired description is correct?

17. The filament relationships in four flowers are shown below.

The correct classification is:

18. Match each plant with the most characteristic root-system evidence. A Column II entry is used once.

19. 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?

20. Assess the following statements about root modifications.
I. A modification may make storage, support or respiration especially prominent.
II. Modification does not remove the developmental identity of the organ as a root.
III. Roots with similar functions may differ in whether they arise from the radicle or another plant part.
IV. Every modified root must occur completely below the soil surface.

21. Three treatments are applied under otherwise suitable conditions.
P. The exposed portions of mangrove pneumatophores are sealed.
Q. Chlorophyll formation is blocked only in a cactus phylloclade, while the leaf spines remain intact.
R. An insectivorous plant in nitrogen-poor soil receives light and water but is prevented from capturing insects.
Which prediction set is correct?

22. Four flowers are examined after careful dissection.

Which interpretation is accurate?

23. Seedlings are divided into two groups before extensive root branching begins. In Group P, the radicle remains intact and produces a dominant descending axis with smaller lateral branches. In Group Q, the radicle is removed early and numerous roots later arise near the stem base. Which interpretation is correct?

24. The defining differences between racemose and cymose inflorescences are summarised below.

The correct completion of P, Q and R is:

25. 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

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

27. An organ displays the following arrangement. One large posterior petal lies outside two lateral petals. These lateral petals, in turn, overlap two smaller anterior petals that together form a keel. The aestivation is:

28. A female ray floret of Asteraceae is recorded with the actinomorphic symbol and a functional , while its pappus, ligulate corolla and inferior bicarpellary gynoecium are shown correctly. Which correction is required?

29. Which combination is most characteristic of the vegetative morphology and inflorescence of Brassicaceae?

30. 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:

31. Which combination is most characteristic of the vegetative morphology of Malvaceae?

32. A grass floret has one superior unilocular ovary, but two feathery stigma branches arise from its apex. Which inference about the gynoecium is best supported?

33. Which floral formula correctly represents the standard mustard flower?

34. Flower P can be divided into two equal halves through any vertical plane passing through its centre. Flower Q permits equal halves through only one particular vertical plane. Flower R cannot be divided into equal halves through any vertical plane. P, Q and R are respectively:

35. Match each modified structure with its developmental origin and function. Each Column II entry is used once.

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

37. A flower has an undifferentiated floral envelope in which sepals cannot be distinguished from petals. Which symbol should replace separate and entries in its floral formula?

38. In a flower, the gynoecium occupies the highest position on the thalamus, while the calyx, corolla and androecium arise below the ovary. This flower is:

39. 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.

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

41. Assertion: A root modified for storage can no longer participate in anchorage or absorption.
Reason: A root system may perform more than one function at the same time.

42. A flower has a cup-shaped thalamus. The gynoecium lies in the centre, while the calyx, corolla and androecium arise from the rim at approximately the same level as the ovary. The flower is:

43. The middle layer of the developing ovary wall is permanently marked in mango and coconut. At maturity, the marker occurs in mango pulp and in the fibrous coconut husk. Which conclusion follows?

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

45. An unknown plant has fibrous roots, a culm with solid nodes and hollow internodes, narrow sheathing leaves with ligules, and spikelets enclosed by basal glumes. Each floret has lemma, palea, two lodicules, three versatile anthers and a superior one-ovulate ovary. It belongs to:

46. Four spreading structures are described below.

The correct sequence of identities is:

47. A potato plant bears an underground swollen organ with distinct eyes arranged at nodes. The aerial shoot has alternate exstipulate leaves with reticulate venation. The strongest interpretation is:

48. Cell division remains normal in the meristematic region of a root, but enlargement of newly produced cells is strongly inhibited. Differentiation of older cells can still occur. Which outcome is most likely?

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

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