Morphology of Flowering Plants Mock Test – Class 11 Biology

1. A small reduced leaf occurs at the base of the pedicel, below the floral whorls. The flower bearing this structure is described as:

2. The terminal apex of an inflorescence remains vegetative during observation and continues adding new axis tissue. Flowers at lower nodes open before those at higher nodes. The strongest inference is:

3. An unknown mature seed has one cotyledon but lacks persistent endosperm. No maize-like fused fruit wall is present. Which inference is most justified?

4. A pinnately compound leaf has an axillary bud only at the base of its entire rachis. After the terminal leaflet is removed, no branch develops from the leaflet base, but the bud at the rachis base later produces a shoot. Which inference is justified?

5. An unknown one-seeded fruit develops from a monocarpellary superior ovary. Its outer layer is thin, its middle layer is thick, and its innermost fruit-wall layer forms a hard covering around the seed. The fruit is best classified as:

6. A plant has a bisexual actinomorphic flower with five united petals, five epipetalous stamens and a superior bicarpellary ovary with axile placentation. Its leaves are commercially processed as a fumigatory source. The plant is most likely:

7. Five adjacent petals P, Q, R, S and T have these margin relations: P overlaps both Q and T; Q overlaps R; S overlaps R; and T overlaps S. Which interpretation is correct?

8. A carrot plant develops normally from the radicle, but a mutation prevents the primary root from becoming swollen and food-rich. Which interpretation is best?

9. Three flowers are described below.

The hypogynous flower is:

10. A compact, vertical, swollen underground axis bears buds and survives after the aerial parts die. Under favourable conditions, a bud produces a new shoot. This behaviour is most consistent with:

11. A mustard ovary initially has ovules attached to the inner wall and one main chamber. During development, inward growths form a false septum, making the ovary appear bilocular. Which conclusion is justified?

12. The following statements concern the calyx and corolla.
I. Both are commonly regarded as accessory floral whorls.
II. Calyx members are sepals, while corolla members are petals.
III. Calyx usually lies outside the corolla.
IV. Fusion within either whorl is described using the same complete technical term.

13. Flowers on two similar plants are treated differently. In Plant P, fertilisation occurs and fruits containing seeds develop. In Plant Q, fertilisation is prevented, yet the ovaries enlarge into fruits and the ovules do not become seeds. The fruits of Q are:

14. Four plant organs show the following observations.

The most accurate interpretation of the complete dataset is:

15. The following statements concern modified stems.
I. They may aid storage, perennation, vegetative spread, climbing, defence or photosynthesis.
II. Diagnostic stem features can persist even when the organ grows underground.
III. A specialised function does not by itself convert a stem into a root or leaf.
IV. Every modified stem must bear fully expanded green foliage leaves.

16. Which term completes the relation ?

17. Two developing storage organs receive permanent lineage labels. Label P is placed on the radicle and later occurs in a swollen organ without nodes or buds. Label Q is placed on a plumule-derived branch and later occurs in an underground swollen organ bearing eyes. Which conclusion is correct?

18. A flower is examined in longitudinal and transverse sections. The calyx, corolla and stamens arise below the ovary. Ovules are attached to the inner ovary wall, and a false septum makes the cavity appear divided. Which interpretation is correct?

19. In a compound leaf, leaflets occur successively along a common axis. A narrow cut removes the distal portion of this axis, detaching only the leaflets beyond the cut while the basal leaflets remain attached. The observation supports identification of the leaf as:

20. Roots arising from lower stem nodes of a maize plant normally provide additional support. A mutation prevents them from becoming thick and mechanically effective, but they still originate from the same stem nodes. They should be described as:

21. Assertion: Two flowers may contain the same number of carpels but differ as apocarpous and syncarpous.
Reason: Carpel number and the state of fusion among carpels are separate morphological characters.

22. 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:

23. An unknown grain has an outer covering in which the fruit wall cannot be separated from the seed coat. Most of its interior is endosperm, while a lateral embryo contains a scutellum, coleoptile and coleorhiza. It is:

24. Use the two arrangements described below. In Flower P, the sepals are united along part of their margins. In Flower Q, each sepal remains separate from the others. P and Q are respectively:

25. In a flower, four free petals are arranged at right angles so that the corolla resembles a cross. This corolla is described as:

26. A mutation in an Asteraceae disc floret prevents anther fusion, but the five filaments remain free and all anthers continue producing pollen. Which character is specifically lost?

27. After leaves fall, Stem P shows one leaf scar at each node, Stem Q shows two scars directly opposite each other at every node, and Stem R shows four scars at the same level around each node. Their former phyllotaxy was:

28. A normal Brassicaceae flower has four long and two short fertile stamens. A mutation equalises all filament lengths without changing the number, fertility or freedom of the stamens. Which character is specifically lost?

29. Four ovary sections show the following features.

Which classification is accurate?

30. Two flowers share actinomorphy and a superior bicarpellary syncarpous ovary.

The correct family assignment is:

31. 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:

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

33. A piece of ginger containing a bud remains underground after the aerial shoot dies. Later, the stored reserves support the development of a new shoot from that bud. The observations demonstrate that a rhizome contributes to:

34. Review the statements concerning stem tendrils and thorns.
I. A stem tendril may develop from an axillary bud and assist climbing.
II. An axillary stem thorn provides mechanical protection.
III. Similar stem origin does not require the two structures to perform the same function.
IV. A stem tendril and a leaf tendril are identical in developmental origin.

35. Review the statements concerning a cymose inflorescence.
I. The main axis terminates in a flower.
II. Growth of that main axis becomes limited.
III. The terminal flower is generally older than flowers formed below it.
IV. Younger flowers are added progressively toward the apex of an indefinitely growing axis.

36. 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.

37. A transverse section of an ovary shows ovules attached to the inner peripheral wall. The centre of the ovary is empty, and no true septa connect the wall with a central axis. This arrangement is:

38. 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?

39. Eight fertile stamens occur in a flower, and every filament remains completely separate from all the others. The androecium is best described as:

40. Review the statements concerning monocot seeds.
I. Monocot seeds are generally endospermic at maturity.
II. Orchids provide a non-endospermic monocot exception.
III. A monocot embryo possesses one cotyledon.
IV. Presence of one cotyledon proves that mature endosperm must always persist.

41. 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:

42. A storage organ is excavated from below the soil. It bears regularly spaced nodes, scale leaves and buds but lacks a root cap and root hairs. It should be classified as:

43. A unilocular ovary contains ovules on a free central column and lacks septa. If the ovules become attached to the inner ovary wall while the ovary remains unilocular, which placentation would result?

44. Four underground structures are described.

The most accurate classification is:

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

The correct completion of P, Q and R is:

46. Flower P has distinct petals, and the stamens arise attached to their inner surfaces. Flower Q has an undifferentiated perianth, and the stamens are attached to its members. P and Q are respectively:

47. A longitudinal section of an onion bulb shows a short compressed stem bearing numerous thick, fleshy scale leaves. Most reserve food is concentrated in these surrounding scales. The principal storage structures are:

48. Review the following statements.
I. A fibrous-root system commonly develops after the primary root becomes short-lived.
II. Every group of adventitious roots necessarily forms a fibrous-root system.
III. Roots descending from banyan branches are adventitious in origin.
IV. Adventitious roots are defined by their origin rather than by their function.

49. Three climbing structures perform the same broad function. P is continuous with a stem node and bears a bud in its developmental series. Q replaces the terminal leaflet of a compound leaf and has no axillary bud at its own base. R arises from a stem and attaches to a support but has root organisation. P, Q and R are respectively:

50. Morphology of flowering plants primarily deals with: