Plant Kingdom Mock Test – Class 11 Biology

1. Two plant populations have nearly identical vegetative morphology. One population nevertheless has a distinct chromosome complement and a consistently different profile of chemical constituents. The strongest classification decision is to:

2. All four megaspores form normally inside an ovule, but none remains capable of further mitotic development. The ovule will most directly fail to form:

3. Consider the following statements about limitations of artificial classification.
I. Reliance on a few characters may separate closely related organisms.
II. Vegetative characters are generally more readily influenced by environment than sexual characters.
III. Equal weighting of vegetative and sexual characters is always reliable.
IV. A change in habitat may alter the placement of the same lineage in a morphology-heavy system.

4. The roots of Pinus commonly form a mutually beneficial association with:

5. Assertion: Bryophytes are called amphibians of the plant kingdom because xylem and phloem carry water between aquatic and terrestrial phases.
Reason: Their plant bodies live on land, but external water is needed for fertilisation.

6. Examine the generation profiles.

P, Q and R represent:

7. Arrange the structures from the larger supporting unit to the reproductive cells produced within it.
P. Spore mother cell
Q. Sporophyll
R. Haploid spores
S. Sporangium

8. In an algal sample, two fusing gametes are unequal in size, but the larger one has not been identified as a non-motile female gamete. On the available evidence, the safest classification is:

9. Examine the recorded relations.

The final record should be replaced by:

10. Two bryophytes are described.
Plant P has a dorsiventral thallus bearing gemma cups.
Plant Q develops a protonema, an upright leafy gametophyte and an attached capsule-bearing sporophyte.
The correct identification is:

11. From the protoplast outward, the most appropriate description of a brown-algal cell boundary is:

12. Plant P bears exposed ovules that later form uncovered seeds. Plant Q forms seeds enclosed within fruits. P and Q are respectively:

13. Match each Marchantia structure with its relation. A Column II entry is used once.

14. Bryophytes are especially common in:

15. Aquatic animals may depend indirectly on algae even when they do not consume algae themselves, since algae:

16. Prothalli bear normal antheridia and archegonia, but the surface remains completely dry throughout the reproductive period. The most likely result is:

17. Study the comparison below.

Which row requires correction?

18. A learner states, “Selaginella is a seed plant because its embryo develops within a retained female gametophyte.” The best correction is:

19. Sphagnum is economically important because it forms peat that may be used as:

20. A figure labels Plant P as a representative dicotyledon and Plant Q as a representative monocotyledon but supplies no other structural information. The safest conclusion is:

21. The complete symbolic transition from one diploid sporophyte to the next diploid sporophyte is:

22. An alga contains abundant r-phycoerythrin and is collected from warm marine water. It most likely belongs to:

23. Assertion: A female gymnosperm strobilus belongs to the sporophytic generation.
Reason: It is composed of megasporophylls borne on the diploid plant body.

24. An unknown plant has true roots, stem and leaves with xylem and phloem. Its dominant body is diploid, it bears sporangia on sporophylls, and its spores form small free-living prothalli. It is a:

25. A leaf-like structure bears one or more sporangia on a pteridophyte sporophyte. It is called a:

26. A student claims that recording many superficial vegetative characters automatically converts an artificial system into a natural one. The best evaluation is:

27. Four brown-algal specimens range from a small branched filament to kelps measuring , and . The data best illustrate:

28. The structural innovation that separates pteridophytes from bryophytes most directly is:

29. Leaf arrangement helps distinguish leafy liverworts from mosses because liverwort appendages commonly occur:

30. The internally consistent algal profile is:

31. In a bryophyte, the archegonium is located on the:

32. A learner defines algae as “only microscopic unicellular organisms.” The definition is inadequate since algae also include:

33. Early artificial systems commonly grouped plants by readily visible features. A character set most typical of such a system is:

34. A learner states, “Every heterosporous plant is automatically a seed plant.” The statement is incorrect because:

35. Equal-sized pieces are cut from a viable filamentous algal thallus and placed separately in suitable culture medium. Each piece grows into a complete filament without producing or fusing gametes. The observation demonstrates:

36. The relationship between reserve food and pyrenoids in Chlorophyceae is best stated as:

37. Match each gymnosperm structure with its immediate relation. A Column II entry is used once.

38. Clonal plants are grown under two conditions and scored as shown.

A system gives all four records equal taxonomic importance. The most justified concern is that:

39. A current removes the holdfast from a kelp while leaving much of the stipe and frond undamaged. The earliest likely consequence is:

40. Examine the reproductive records below.

The categories represented by P, Q and R are, respectively:

41. Three gymnosperm figures are described.
P. A largely unbranched stem bears a crown of pinnate leaves.
Q. A branched coniferous tree bears male and female cones on the same plant.
R. Long shoots bear dwarf shoots associated with seeds.
The correct identification of P, Q and R is:

42. A primarily marine brown alga may range in organisation from a branched filament such as Ectocarpus to a profusely branched kelp. This range characterises:

43. An algal specimen is unicellular and protein-rich but does not supply agar. It is marketed directly as a dietary supplement. This profile most closely matches:

44. A study codes observable plant characters as numerical values, gives each character equal importance and analyses the data by computer. The method is:

45. Two closely related plants are grown under different light and water conditions. Their leaf size, colour and growth habit become markedly different, but their floral structures remain stable. A system based mainly on vegetative appearance would be unreliable because:

46. The most accurate bryophyte-pteridophyte comparison is:

47. In Spirogyra, the fusing gametes are similar in size but non-motile. Their fusion is classified as:

48. The following matrix records the absence or presence of four observable characters in three plants, using for absence and for presence.

Computer-assisted comparison of this coded matrix is characteristic of:

49. The usual primary root system of a gymnosperm develops as:

50. A complete Chlorophyceae table profile is: