Biological Classification Mock Test – Class 11 Biology

1. Four disease records are summarised below.

The strongest inference from the records is that:

2. Microscopic examination reveals elongated bacterial cells with approximately cylindrical, rod-like bodies. They are classified morphologically as:

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

4. Eubacteria are commonly described as true bacteria possessing:

5. Equal fragments are cut from a basidiomycete mycelium and placed on separate suitable substrates. Each fragment forms a new colony without producing spores. The result demonstrates:

6. Air currents increase around mature slime-mould fruiting bodies without changing spore production. The most direct predicted effect is:

7. The reciprocal functions of lichen partners are summarised below.

The correct identification is:

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

9. Sunlight is removed from a culture of Euglena, but suitable small organisms remain available as food. The most likely response is that Euglena:

10. Bacteria have been recorded in ordinary soil as well as hot springs and highly saline environments. The most appropriate interpretation is that:

11. A continuous fungal tube contains many nuclei but lacks cross walls. This organisation is:

12. 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:

13. Assertion: Meiosis follows karyogamy in the core fungal sexual cycle.
Reason: Karyogamy creates a diploid nucleus that must undergo reduction to restore haploid spores.

14. Match each protozoan group with its principal identifying character. A Column II entry is used once.

15. The statement that asexual spores are generally absent in Basidiomycetes should be interpreted to mean that:

16. The gametophyte phase of a plant life cycle is characterised by the nuclear condition:

17. A cellulose-rich cell wall is most consistently associated with the general kingdom profile of:

18. A unicellular organism is motile, possesses a definite nucleus, and can photosynthesise under suitable conditions. Its difficult placement in a strict two-kingdom system arises from:

19. Four fungal isolates are compared below.

Among isolates with branched and septate mycelia, which comparison most clearly shows that a shared saprophytic role does not by itself establish the same fungal class?

20. Assertion: A widely branching mycelium is well suited to absorptive nutrition.
Reason: Its numerous hyphae increase contact with the substrate from which soluble nutrients are taken up.

21. Assertion: A viroid should not be described as a protein-coated RNA virus.
Reason: Its infectious agent is low-molecular-weight free RNA lacking a capsid.

22. Assertion: Presence of a cell wall is sufficient to place any organism in Plantae.
Reason: Fungal nutrition and wall composition differ from those of green plants.

23. Assertion: Most plant viruses are described as having single-stranded RNA.
Reason: A virus contains either RNA or DNA as its genetic material, not both.

24. A fungal mutation allows normal ascus formation but prevents asci from being organised into a fruiting body. The structure specifically missing is:

25. Pigments in euglenoids are described as being identical to those in:

26. Two bacterial populations begin with equal cell numbers. Population P undergoes repeated fission, while Population Q forms resistant spores without additional cell divisions. After the same interval, the most likely difference is:

27. The fungal cell wall is composed mainly of:

28. A heterotrophic bacterium is found on dead wood rather than living tissue. The evidence most strongly supports a role as:

29. 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?

30. A filamentous fungus forms conidia normally, but fragments of its mycelium fail to establish new colonies. Which reproductive route remains directly demonstrated?

31. Match each archaebacterial group with its characteristic habitat or association. A Column II entry is used once.

32. Four organisms have the following profiles.

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

33. An organism absorbs dissolved organic matter from a dead substrate, whereas another ingests solid food. This contrast is classified most directly under:

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

35. Fungus P obtains nutrients from fallen leaves, whereas Fungus Q draws nutrients from living crop tissue and damages the host. P and Q are respectively:

36. Two bacterial cultures have the same spherical shape and both lack a nuclear membrane. Culture P makes food using light, whereas Culture Q absorbs organic substances. The observations support the conclusion that:

37. A prion is best defined as:

38. Assertion: Euglena is not placed in Plantae merely because it contains plant-like photosynthetic pigments.
Reason: It is a unicellular eukaryote with a pellicle and can become heterotrophic when sunlight is absent.

39. A bacterial diagram labels P on a spherical cell and Q on a resistant structure formed within a different bacterial cell. Which interpretation respects the information supplied by both labels?

40. A unicellular fungus divides into two daughter cells of nearly comparable size without forming a specialised spore. This represents:

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

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

The sample most consistent with Mycoplasma is:

43. The set containing only asexual fungal spores is:

44. A prolonged dikaryotic phase is especially characteristic of:

45. Four fungal observations are summarised below.

The data best support the conclusion that fungi:

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

47. Two fungi produce asexual spores as shown below.

The most accurate interpretation is:

48. Formation of a fungal spore occurs without fusion of compatible cells or nuclei. The spore should be classified primarily as:

49. Calling a virus a nucleoprotein should not be interpreted to mean that the particle possesses:

50. Samples from three sites give the following observations.

The strongest conclusion is that: