Biological Classification Mock Test – Class 11 Biology

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

2. A student describes all archaebacteria as organisms restricted to hot springs. The description should be revised since archaebacteria also include:

3. A many-sided viral capsid built from repeating protein subunits is best described as:

4. A labelled bacteriophage structure has several thin projections extending from the lower end of the particle. These projections are the:

5. The two nuclear events occurring successively within a basidium are:

6. A mutation allows normal karyogamy and meiosis inside a basidium but prevents formation of external spore-bearing projections. The most direct consequence is failure to:

7. T.O. Diener is associated with the discovery of:

8. Four fungal observations are summarised below.

The data best support the conclusion that fungi:

9. Animals commonly differ from continuously growing plant bodies in that adult animals tend to:

10. Eubacteria are commonly described as true bacteria possessing:

11. A bacterium appears as a short curved rod resembling a comma rather than a complete spiral. Its morphological category is:

12. A fungus originally placed in Deuteromycetes is later observed producing basidia and basidiospores. Its classification should be:

13. The most important exception to the statement that fungi are generally filamentous is:

14. Match each bacterial disease with its affected host category. Column II entries may be reused.

15. Puccinia is placed among Basidiomycetes as a representative of:

16. Viral structures are compared below.

The correct interpretation is:

17. Assertion: Capsomere arrangement contributes to the external geometry of a virus.
Reason: Capsomeres are protein subunits that assemble into the capsid.

18. An autotrophic bacterium is defined by its ability to:

19. A treatment blocks both pseudopodium formation and ciliary beating but leaves flagella and infectious spore-like stages unaffected. Which pair of protozoan groups would lose their principal locomotory structures most directly?

20. A plant species supplies both edible seeds and fibres for clothing. What does this example show about classification based only on human use?

21. 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?

22. Two forest plots receive equal amounts of leaf litter. Active decomposer deuteromycetes are removed from Plot Q but remain abundant in Plot P. If other conditions are similar, the most likely result is:

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

24. A prolonged dikaryotic phase is especially characteristic of:

25. Assertion: Basidiomycetes can reproduce sexually even though distinct sex organs are absent.
Reason: Compatible vegetative cells of different strains can fuse and initiate a dikaryotic phase.

26. If karyogamy occurs normally in a basidium but meiosis is experimentally blocked, the immediate result is:

27. A laboratory record notes that one organism lacks a membrane-bound nucleus, while another has a definite nucleus and membrane-bound organelles. The classification criterion being applied most directly is:

28. In basidiomycetes, asexual spores are generally absent, while a common vegetative method is:

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

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

31. 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:

32. The central difference between photosynthetic and chemosynthetic autotrophic bacteria lies in the source of:

33. A multicellular eukaryote lacks a cell wall, ingests food, and shows organ-system organisation. Even before its reproductive details are known, the combined evidence most strongly indicates:

34. The external covering of a typical dinoflagellate is strengthened by:

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

36. Under suitable environmental conditions, separate slime-mould cells may aggregate and form:

37. A marine unicellular heterotroph is enclosed by a silica shell, but extensions of the cell project through openings and surround prey. It is best classified as:

38. An aquatic microorganism possesses a definite nucleus, flagella, and a flexible pellicle instead of a cell wall. It photosynthesises in light but becomes heterotrophic when light is unavailable. Its most appropriate kingdom-level placement is:

39. Animals depend directly or indirectly on plants mainly because plants:

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

41. An infectious sample contains no detectable RNA or DNA, but abnormal protein is present. The most defensible identification is:

42. An unknown organism is first placed with plants because it possesses a wall. Later observations reveal that it is unicellular, lacks a membrane-bound nucleus, and may obtain food heterotrophically. The revised evidence most strongly supports placement in:

43. The wall character that most directly supports placement of a multicellular photosynthetic eukaryote in Plantae is:

44. The set containing only sexual fungal spore categories is:

45. The flexibility of a euglenoid cell is mainly due to the presence of:

46. The appropriate description of animal viruses allows their genetic material to be:

47. Transfer of DNA from one bacterium to another is described as a primitive sexual process mainly since it:

48. Three bacterial cultures are compared below.

The most accurate classification is:

49. A heterotrophic bacterium produces a substance that suppresses the growth of certain competing microbes. The substance is classified as:

50. A cyanobacterial population may occur as single cells, colonies, or filaments. This observation demonstrates variation in: