Biological Classification Mock Test – Class 11 Biology

1. A fungus has a repeatedly branching mycelium with cross walls dividing its hyphae into compartments. This vegetative structure matches the general deuteromycete condition of:

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

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

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

5. An organism is unicellular, motile, photosynthetic in light, and heterotrophic when light is absent. In relation to the two-kingdom system, this combination:

6. Assertion: Alternation of generations does not require the gametophyte and sporophyte to be equally long-lived.
Reason: The duration and independence of the two phases vary among plant groups.

7. Four organisms have the following profiles.

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

8. Assertion: An ascus and an ascocarp should not be treated as interchangeable structures.
Reason: An ascus contains ascospores, whereas an ascocarp contains or organises many asci.

9. A claim states that walls of archaebacteria and eubacteria are structurally identical, so habitat tolerance cannot differ between them. This claim conflicts with the observation that:

10. Sexual reproduction in Basidiomycetes can begin even though distinct sex organs are absent because:

11. The names of major kingdoms may remain familiar while the membership of particular groups changes. This situation indicates that:

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

13. The genetic material most characteristically associated with bacteriophages in the stated comparison is:

14. A plant cell and a fungal cell both possess walls. Their wall compositions differ most characteristically as:

15. Consider the following statements about bacterial organisation.
I. Prokaryotic organisation is relatively simple.
II. All bacteria obtain energy through the same pathway.
III. Bacterial groups display considerable metabolic diversity.
IV. Similar bacterial shape guarantees an identical ecological role.

16. Assertion: Prions are not classified as viruses.
Reason: Prions consist of infectious abnormal protein and contain no viral nucleic-acid genome.

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

18. A lichen is best described as:

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

20. Match each fungal nutritional association with the most appropriate description. A Column II entry is used once.

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

22. Two autotrophic bacteria use carbon dioxide as a raw material. One depends on sunlight, while the other oxidises inorganic compounds. Their common feature is:

23. Tobacco mosaic virus and a typical bacteriophage differ most clearly in that:

24. A labelled protistan figure shows numerous cilia over the surface and a depression leading into a gullet. The organism is most likely:

25. Fish deaths during some red tides are most directly associated with:

26. If the mycobiont is removed while the photosynthetic partner remains alive, the most immediate loss to the association is:

27. Protista is regarded as having an indistinct boundary partly because its members include:

28. Dead leaves accumulate in two identical containers. Container P contains an active community of decomposer bacteria, whereas Container Q has had those bacteria removed. Over time, the most likely difference is that:

29. A chlorophyll-deficient plant twines around another plant and draws nutrients from the host. It is most appropriately identified as:

30. The distinction between plasmogamy and karyogamy is that plasmogamy involves fusion of:

31. Four disease records are summarised below.

The strongest inference from the records is that:

32. The repeating protein subunits that collectively construct a viral capsid are:

33. Fusion of the protoplasm of two compatible fungal cells is called:

34. Damage to sensory receptors while motor structures remain intact would most directly reduce an animal's ability to:

35. Compare the infectious agents below.

The correct identification of P, Q and R is:

36. Assertion: Methanogens contribute to biogas production from cattle dung.
Reason: These archaebacteria produce methane under suitable anaerobic conditions.

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

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

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

40. A euglenoid is observed with two flagella of different lengths. The most accurate description is:

41. The principal reserve foods associated with animals are:

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

43. Consider the following statements about Beijerinck’s work.
I. Extract from diseased plants could infect healthy tobacco plants.
II. The agent was interpreted as a new transmissible infectious entity.
III. The work established the complete molecular structure of the virus.
IV. The term virus became associated with the filterable agent.

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

45. Two organisms are both non-motile and possess cell walls. One is photosynthetic with a cellulose wall, while the other absorbs nutrients and has a chitinous wall. The most justified conclusion is that:

46. In a basidiomycete, the structure formed from the dikaryotic phase and serving as the site of nuclear fusion is the:

47. Consider the following statements.
I. Fission directly increases bacterial cell number.
II. Resistant spores help some bacteria survive unfavourable conditions.
III. DNA transfer may produce genetic exchange.
IV. DNA transfer and fission always have the same immediate outcome.

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

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

50. Which inference would be scientifically unjustified from Beijerinck’s disease-transmission experiment alone?