Biological Classification Mock Test – Class 11 Biology

1. 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?

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

3. A virus enters a suitable host cell but is prevented from using the host's ribosomes and enzymes. The most likely outcome is:

4. A higher animal has functioning muscles but defective neuromotor coordination. The most likely result is:

5. The statement that most animals are capable of locomotion should be interpreted to mean that:

6. 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:

7. Three bacterial cultures are compared below.

The most accurate classification is:

8. A mushroom, a spreading bread mould, and a single yeast cell differ visibly, yet all can be placed in Fungi. This placement shows that:

9. An acellular infectious particle contains double-stranded RNA and multiplies only inside animal cells. Under the appropriate comparison, it is most consistent with:

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

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

12. A spherical bacterium bears a flagellum and moves actively. Its most accurate morphological description remains:

13. 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:

14. Consider the following statements about Whittaker's classification criteria.
I. Cell structure helps distinguish prokaryotic from eukaryotic organisms.
II. Mode of nutrition helps separate absorptive fungi from ingestive animals.
III. Body organisation is irrelevant once a cell wall is identified.
IV. Phylogenetic relationship contributes to a natural classification.

15. The reproductive structures of a basidiomycete are summarised below.

The correct interpretation of P, Q and R is:

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

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

18. A cellulose-walled photosynthetic organism must be distinguished from a chitin-walled absorptive organism. The additional criterion that most directly uses the wall evidence is:

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

20. Most euglenoids are commonly found in:

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

22. 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:

23. An unknown organism is multicellular, eukaryotic, photosynthetic, and possesses cellulose-rich walls. Which evidence most clearly separates it from a photosynthetic cyanobacterium?

24. 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:

25. Bacteria living in association with the roots of leguminous plants may benefit the plant most directly by:

26. When two organisms resemble each other externally but evidence indicates different evolutionary histories, a modern classification gives special importance to:

27. 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:

28. Three infectious samples are analysed. In P, an infective nucleic acid is normally enclosed by a protein coat. Q remains infectious as free low-molecular-weight RNA without a protein coat. R contains no nucleic acid, and its infectivity is associated with an abnormal protein. Which identification is correct?

29. A unicellular eukaryote photosynthesises in light but obtains organic food heterotrophically in darkness. This nutritional flexibility is compatible with:

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

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

32. 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:

33. Which conclusion goes beyond what Ivanowsky’s filtration experiment alone could establish?

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

35. A lichen is best described as:

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

37. Equal pieces of moist bread are kept under four conditions for several days. Visible fungal growth is expected to develop most rapidly in:

38. An ascomycete is isolated from animal dung and obtains nutrients from that substrate. Its nutritional description is:

39. If the phycobiont is removed from an otherwise intact lichen association, the function most directly lost is:

40. Compare the two viral profiles.

The correct identification is:

41. Study the changes shown below.

The table most strongly demonstrates that improved criteria can:

42. In higher animals, sensory and neuromotor mechanisms work together mainly to:

43. A fungal culture releases a substance that inhibits the growth of certain bacteria. Among the familiar examples, the culture is most likely related to:

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

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

46. Consider the following fungal reproductive events.
I. A hyphal fragment develops into a new mycelium.
II. A small outgrowth separates from a yeast cell.
III. Two compatible nuclei fuse.
IV. A unicellular fungus divides into daughter cells.
The vegetative events are:

47. A unicellular fungal culture is used in both bread and beer preparation. Which named fungus best fits this description?

48. Two genetically compatible but unfused haploid nuclei share one fungal cell. This nuclear condition is called a:

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

50. In the general animal life pattern, sexual reproduction is followed by: