Biological Classification Mock Test – Class 11 Biology

1. Two classification systems are compared below.

The stronger inference from the comparison is that:

2. A learner argues that Protista should contain only heterotrophic organisms since Amoeba and Paramoecium are placed there. The most accurate correction is that:

3. The photosynthetic partner in a lichen is called the:

4. Chrysophytes include:

5. A bacteriophage figure is described from top to bottom. Label P marks the protein head, Q marks the short region immediately below the head, R marks the elongated tail sheath, and S marks the thin projections extending from the lower end. Which label represents the collar?

6. Which host-linked viral nucleic-acid relation is correctly stated?

7. Match each fungal spore with the feature that most specifically distinguishes its formation. A Column II entry is used once.

8. Green algae and fungi were once placed together under Plantae. The strongest biological objection to this arrangement is that:

9. A mutation prevents a slime mould from forming true walls around its spores, while fruiting bodies still develop normally. The most likely consequence is:

10. A photosynthetic bacterium and a green plant may both appear plant-like, yet the two-kingdom system fails to distinguish their fundamental difference in:

11. In the bacteriophage figure, the nucleic acid is located primarily within the:

12. Future discoveries are most likely to change a biological classification when they:

13. If a viral capsid is severely damaged while the nucleic acid remains initially intact, the function most directly lost is:

14. The wall of a diatom consists of:

15. Among different plant groups, the gametophyte and sporophyte may differ in:

16. A fungus has an aseptate coenocytic mycelium, produces motile or non-motile spores inside sporangia, and forms a zygospore after gamete fusion. It belongs to:

17. A microscopic view shows numerous branching threads interwoven across a decaying fruit. The complete interwoven structure should be labelled:

18. A learner groups cholera, typhoid, tetanus, and citrus canker as four human bacterial diseases. The required correction is that:

19. An archaebacterium survives in an extreme habitat partly through its distinctive wall organisation. If that wall adaptation is severely disrupted while the cell remains prokaryotic, the most direct prediction is:

20. In a filament of Nostoc, a specialised enlarged cell is labelled among ordinary photosynthetic cells. Its principal function is:

21. A learner adds Viruses as a sixth member of Whittaker's original kingdom list. The most accurate correction is:

22. In some protists, a sexual process involves cell fusion followed by formation of a zygote. This differs from asexual reproduction because it:

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

24. In a lichen, the fungal mode of obtaining organic food is best described as:

25. A plant bears modified leaves that close rapidly around an insect and later obtains nutrients from the captured organism. The plant is most closely represented by:

26. 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.

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

28. Arrange the following events in chemosynthetic autotrophy.
P. An inorganic substance is oxidised.
Q. Energy is released.
R. ATP becomes available for cellular work.
S. Organic food is synthesised from inorganic raw materials.

29. The correct chronological order of three major observations concerning the tobacco mosaic agent is:

30. Match each scientist with the observation or interpretation most closely associated with the tobacco mosaic agent.

31. Four organisms have the following profiles.

The pair that shares photosynthetic nutrition and a cell wall but differs in prokaryotic versus eukaryotic organisation is:

32. Bacteria are recovered from soil, freshwater, ocean water, air-borne particles, and the surfaces of living organisms. This observation most strongly supports the conclusion that bacteria:

33. A fungal specimen has a branched mycelium divided repeatedly by cross walls. This vegetative organisation is characteristic of an ascomycete because it is:

34. The set containing only asexual fungal spores is:

35. A proposed sixth kingdom contains only viruses. The main reason this does not match Whittaker's normal five-kingdom placement is that viruses are:

36. Which set contains only human diseases caused by viruses?

37. Basidiospores differ from ascospores most directly in their position of formation because basidiospores are:

38. Consider the following statements about Kingdom Animalia.
I. Members are multicellular eukaryotes.
II. Cell walls are absent.
III. Food is generally ingested and digested internally.
IV. Starch is the principal reserve carbohydrate.

39. A bacterial species improves soil nitrogen availability in legume fields but does not directly decompose dead leaves. This observation shows that beneficial bacteria:

40. After nuclear organisation is added as a classification criterion, photosynthetic bacteria can be separated from green plants primarily by the:

41. Bacterial abundance across ordinary and extreme habitats is best related to their:

42. A newly observed prokaryote has a rigid wall but no visible flagellum. The most defensible interpretation is that it:

43. Eubacteria are commonly described as true bacteria possessing:

44. In a typical ascomycete, conidia are produced:

45. Basidia are normally arranged within the larger reproductive structure called a:

46. The feature that most directly separates a viroid from an RNA virus is that the viroid:

47. The set consisting entirely of named deuteromycete examples is:

48. A multicellular eukaryote has cellulose-rich cell walls, photosynthetic nutrition, and specialised tissues and organs. This profile is most consistent with:

49. Examine the profiles below.

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

50. The insectivorous plant commonly known for possessing bladder-like traps is: