Plant Kingdom Mock Test – Class 11 Biology

1. A gymnosperm has a largely unbranched stem, persistent pinnate leaves and coralloid roots containing nitrogen-fixing cyanobacteria. Male and female reproductive structures occur on separate plants. It is:

2. A vascular plant forms flowers, and its mature seeds occur inside fruits. It is:

3. A gymnosperm drawing shows an elongated branch bearing short lateral shoots, with seeds associated with the short shoots. The plant is most appropriately identified as:

4. A classifier converts only leaf colour and growth habit into numerical codes and then claims that the analysis necessarily represents broad natural affinity. The most important criticism is that:

5. A hypothetical seed plant originally has exposed ovules. A mutation causes every ovule to develop permanently inside an ovary that later forms a fruit. This changed reproductive boundary would:

6. From the protoplast outward, the usual order of the two principal wall layers in Chlorophyceae is:

7. Coralloid roots of Cycas are associated with:

8. Examine the reproductive profiles.

P, Q and R most appropriately represent:

9. A table lists a Phaeophyceae specimen as freshwater, with chlorophyll a and c, mannitol and two unequal lateral flagella. The freshwater entry should be interpreted as:

10. Sunken stomata conserve water because they:

11. The incomplete comparative record is shown below.

The missing entry is:

12. An ovule is successfully fertilised and contains a developing embryo, but the entire ovule is experimentally removed from the parent before maturation. The process most directly interrupted is:

13. A laboratory receives four algal products with their labels accidentally exchanged. The sample that forms a firm microbial-culture gel should be relabelled as:

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

15. Gymnosperm growth habit includes:

16. Consider the following statements about gymnosperm roots.
I. A tap-root system commonly develops.
II. Pinus roots may form mycorrhiza with fungi.
III. Cycas coralloid roots contain nitrogen-fixing cyanobacteria.
IV. The root cells of Cycas alone carry out all atmospheric nitrogen fixation.

17. A treatment partially bleaches the visible pigments of three algal samples, but their reserve foods and motile-cell features remain measurable.
P. Starch; equal apical flagella
Q. Laminarin; two unequal lateral flagella
R. Floridean starch; flagella absent
The correct class sequence for P, Q and R is:

18. A freshwater alga has chlorophyll a and chlorophyll c, stores mannitol and produces motile cells with two unequal lateral flagella. The best interpretation is that it:

19. A chemical treatment prevents flagellar movement in Chlorophyceae zoospores without damaging their ability to germinate. The most direct consequence will be:

20. A classifier groups two look-alike plants together even though their anatomy, embryo development and chemical constituents differ consistently. From the standpoint of natural classification, the main error is:

21. An alga has chlorophyll a and chlorophyll c, stores mannitol, and possesses a cellulosic wall with an outer algin coating. The combined profile identifies:

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

23. Natural classification differs from a few-character artificial system mainly by assessing:

24. Assertion: Assigning extra weight to a few selected traits departs from the numerical-taxonomic procedure described here.
Reason: Numerical taxonomy ignores observable characters and uses fossil evidence alone.

25. A fungicide selectively destroys the mycorrhizal partner of young Pinus plants without directly damaging root cells. The earliest likely consequence is:

26. The ploidy sequence from pteridophyte spore to young sporophyte is:

27. A normal pteridophyte life cycle includes the relation:

28. Two relationship hypotheses are being tested for plants with a poor fossil record. Hypothesis P predicts similar chromosome organisation and chemical profiles, whereas Hypothesis Q predicts marked differences in both. Observations match Hypothesis P. The strongest inference is that:

29. The clearest body-form distinction between Marchantia and a typical moss leafy stage is that:

30. Examine the reproductive records below.

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

31. Four algal samples show the following gamete profiles.

The samples that clearly represent isogamy are:

32. Consider the following statements about gymnosperms.
I. They are vascular seed plants.
II. Their ovules are not enclosed within ovaries.
III. Their seeds are enclosed within fruits.
IV. Their dominant plant body is the sporophyte.

33. Three algal samples show the following features.

The most appropriate interpretation is that:

34. Marchantia gemma cups and a moss protonema differ most directly in that:

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

36. Spores of the same fern are placed on four substrates.

The strongest conclusion is that:

37. An alga appears brown, but no other information is available. The best classification decision is to:

38. The reproductive progression from heterosporous pteridophytes to gymnosperms is most accurately represented by:

39. The gymnosperm cited as one of the tallest tree forms is:

40. A gymnosperm female gametophyte bears three archegonia. The most appropriate interpretation is that it:

41. Examine the three unidentified algal records.

The correct class assignment is:

42. A hypothetical plant has a bryophyte-like dominant gametophyte but also bears true vascular roots and naked seeds on that gametophyte. The profile is biologically inconsistent because:

43. Assertion: Bryophytes and pteridophytes require external water for fertilisation, whereas gymnosperms do not require an external film of water for male-gamete transfer.
Reason: In gymnosperms, pollen reaches the ovule opening and a pollen tube delivers the male gametes.

44. During pteridophyte fertilisation, external water functions primarily as:

45. In a typical fern, archegonia are borne by the:

46. Match each record with the type of information it represents. A Column II entry is used once.

47. Consider the following statements about pteridophyte fertilisation.
I. Antheridia and archegonia occur on the prothallus.
II. Water carries antherozoids toward the archegonium.
III. Fusion produces a diploid zygote.
IV. The zygote develops into the dominant gametophyte.

48. Bentham and Hooker are associated with a natural system of classification developed for:

49. A hypothetical gymnosperm retains heterospory but loses ovule formation, pollen production and pollen-tube delivery. Its reproductive condition would most closely approach:

50. A thick cuticle on a conifer needle most directly: