Biological Classification Mock Test – Class 11 Biology

1. A multicellular eukaryote has branched hyphae, chitin-rich walls, and obtains soluble nutrients by absorption. Its kingdom identity is most consistent with:

2. Conidia and ascospores of an ascomycete differ most directly in that:

3. The basic symbolic relation for alternation of generations is:

4. Beijerinck applied an extract from diseased tobacco plants to healthy plants and observed transmission of mosaic disease. He interpreted the agent as:

5. A chemical treatment blocks pseudopodium formation in an amoeboid protozoan without damaging its nucleus. The most immediate combined effect is:

6. In an amoeboid protozoan, pseudopodia contribute directly to:

7. The statement that bacteriophages usually contain double-stranded DNA should be interpreted as:

8. A lake becomes covered by a dense growth of blue-green photosynthetic prokaryotes after nutrient pollution increases. The event is best identified as:

9. Fusion of gametes in phycomycetes produces a:

10. When a fungal network surrounds or enters the roots of a higher plant and both partners benefit, the association is called:

11. Match each bacterial form with its characteristic shape. A Column II entry is used once.

12. Variation in the visible colour of dinoflagellates is explained mainly by differences in:

13. Bacteria possess comparatively simple cellular organisation but display considerable biochemical diversity. This combination means that:

14. Which component is absent from a prion?

15. A specimen produces asexual spores inside an enclosing sporangium rather than externally on conidiophores. Compared with a typical ascomycete, this observation supports:

16. Two compatible basidiomycete hyphae meet, and their cytoplasms fuse while their nuclei remain separate. The event is:

17. Milk is inoculated with a suitable bacterial culture and kept under favourable conditions. The observed conversion into curd demonstrates a bacterial role in:

18. Diener identified the agent of potato spindle tuber disease as low-molecular-weight infectious RNA without a protein coat. This finding established the category of:

19. The observations for four prokaryotic samples are shown below.

The sample most consistent with Mycoplasma is:

20. A filter retains all ordinary bacterial cells from diseased plant sap, but the filtrate remains infectious. This result most directly weakens the hypothesis that:

21. Assertion: Formation of a resistant bacterial spore should not automatically be described as bacterial reproduction.
Reason: Its principal role under unfavourable conditions is survival rather than immediate increase in cell number.

22. The most accurate contrast between a viroid and a prion is:

23. A Mycoplasma culture continues to survive in an environment lacking oxygen. This observation is consistent with the fact that Mycoplasma:

24. A gelatinous covering surrounds a cyanobacterial colony. Its most accurate description is:

25. A section of a mushroom fruiting body contains numerous microscopic spore-producing cells, each bearing sexual spores externally. Which relation among basidiospore, basidium and basidiocarp is correct?

26. Assertion: A lichen represents a mutually useful association.
Reason: The phycobiont prepares food, while the mycobiont supplies shelter, water and mineral support.

27. In phycomycetes, the distinction between zoospores and aplanospores is that:

28. A section through a fungal fruiting body reveals many sac-like structures, each containing sexual spores. The entire fruiting body is the:

29. A fungus collected from a tree stump has branched septate mycelium, forms a conspicuous mushroom-like body, and shows no ordinary asexual spores. The profile most strongly indicates:

30. Mushrooms, bracket fungi, and puffballs are commonly encountered:

31. Tobacco mosaic virus is structurally represented as:

32. The diploid plant phase that alternates with the gametophyte is the:

33. A fungal filament normally has partitions at repeated intervals. If these septa fail to form while nuclear division continues, the filament would tend toward:

34. Viral multiplication inside a host cell may damage the host most directly when:

35. Sac fungi are generally multicellular, but the important unicellular exception is:

36. A figure shows a chain of cyanobacterial cells enclosed by a common sheath. One cell is larger and structurally distinct from its neighbours. The most accurate interpretation is that:

37. Assertion: Unfavourable conditions promote formation of fruiting bodies in slime moulds.
Reason: Fruiting bodies produce resistant spores that can survive adversity and disperse through air.

38. Aspergillus, Claviceps, and Neurospora are classified as:

39. An unknown fungus has branched septate hyphae, produces conidia externally on conidiophores, and forms ascospores inside sac-like structures. Its classification is:

40. Examine the profiles below.

Which profile combines eukaryotic internal organisation with a single-cell body, the defining organisational combination used for Protista?

41. Which conclusion cannot be drawn from the stated three-domain relation alone?

42. An organism has a chitin-containing wall and obtains organic nutrients by absorption. The wall character and nutritional mode together support placement in:

43. Three bacterial cultures are compared below.

The most accurate classification is:

44. Consider the following statements about reclassification under the five-kingdom system.
I. Chlamydomonas and Chlorella had earlier plant-like placements.
II. Amoeba and Paramoecium had earlier animal-like placements.
III. All four are accommodated in Protista as unicellular eukaryotes.
IV. Their common placement means that all four obtain food identically.

45. A multicellular eukaryote with a wall digests food outside its body and absorbs the products. It differs from a typical animal chiefly in:

46. Four disease records are summarised below.

The strongest inference from the records is that:

47. A fungus spreads a branching mycelium through a dead substrate and absorbs soluble products released around the hyphae. Which relation best explains how its body plan supports nutrition?

48. Kingdom Plantae includes:

49. Outside a suitable living cell, many viruses may exist in an inert or crystalline state. This condition shows that extracellular viruses:

50. A prokaryote is collected from a hot, acidic spring. Among the archaebacterial groups, the profile is most consistent with: