Biological Classification Mock Test – Class 11 Biology

1. The year associated with Diener’s identification of the potato spindle tuber viroid is:

2. Consider the following statements about Kingdom Monera.
I. Bacteria are its sole members.
II. Bacteria occur in ordinary as well as extreme environments.
III. All bacteria are obligate parasites.
IV. Some bacteria live in or on other organisms.

3. Assertion: Diatom walls can accumulate extensively on the floors of water bodies.
Reason: Their silica-containing walls are highly resistant and persist after death.

4. A diagram shows a rod-shaped viral particle with a central RNA strand and repeated protein units arranged around it. The repeated units are:

5. Plant symptoms are summarised below.

The correct symptom sequence for P, Q, R and S is:

6. Consider the following statements about protistan organisation.
I. Protists possess a defined nucleus.
II. Membrane-bound organelles occur in their cells.
III. Every protist possesses both cilia and flagella.
IV. Their eukaryotic organisation separates them from Monera.

7. Four conclusions are proposed after archaebacteria are observed in an extreme habitat.
I. Their wall differs from that of other bacteria.
II. The wall difference is associated with survival in harsh conditions.
III. Every archaebacterium must inhabit the same extreme environment.
IV. Detailed wall chemistry can be inferred without further evidence.

8. A lichen is best described as:

9. A bacterium that manufactures organic food using energy obtained from inorganic substances demonstrates that Monera includes:

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

11. A student claims that all unicellular organisms must lack a nuclear membrane. The strongest evidence against this claim is the existence of:

12. 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?

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

14. A wall-bearing unicellular eukaryote cannot be assigned confidently to Plantae merely from that observation because:

15. Chlamydomonas, Chlorella, Amoeba and Paramoecium differ greatly in nutrition and movement, yet the five-kingdom system places them together mainly on the basis of their:

16. 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?

17. 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:

18. For an individual virus, the genetic material is:

19. A bacterium grows in complete darkness using carbon dioxide and energy released by oxidation of nitrites. It is best classified nutritionally as:

20. Lichens are generally absent from heavily polluted areas. The most defensible use of this observation is that lichens:

21. Archaebacteria can survive in harsh habitats partly due to:

22. In a cyanobacterial filament, ordinary cells perform photosynthesis while selected cells specialise in nitrogen fixation. This arrangement demonstrates:

23. Conidia and ascospores of an ascomycete differ most directly in that:

24. A tiny organism lacks a cell wall and a membrane-bound nucleus, yet it has a plasma membrane, cytoplasm, and independent cellular organisation. Which conclusion avoids confusing it with an acellular infectious agent?

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

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

27. Consider the following statements about viroids.
I. They consist of low-molecular-weight RNA.
II. They lack a protein coat.
III. Potato spindle tuber disease is a named example.
IV. They are smaller than ordinary viruses.

28. A mutation alters the shape of viral capsomeres so that they can no longer fit together correctly. The most direct structural consequence is:

29. Most euglenoids are commonly found in:

30. A coastal event discolours seawater red and is caused by rapid multiplication of toxin-producing eukaryotic cells. It should not be called a cyanobacterial bloom because the causative organisms are:

31. An unknown eukaryotic organism lacks a cell wall and obtains food by ingestion. This combination most strongly separates it from:

32. Assertion: A bacterium oxidising ammonia can remain autotrophic in darkness.
Reason: Energy released from oxidation of an inorganic substance can support synthesis of organic food.

33. A phycomycete and an ascomycete are compared. The most accurate contrast is:

34. Compare the infectious agents below.

The correct identification of P, Q and R is:

35. Some marine amoeboid protozoans differ from freshwater Amoeba by possessing:

36. 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:

37. Diatoms are regarded as chief producers in oceans because they:

38. A prolonged dikaryotic phase is especially characteristic of:

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

40. A microorganism has a membrane-bound nucleus, forms pseudopodia, and engulfs food particles. It lacks a chitinous cell wall and does not form a filamentous mycelium. In the five-kingdom system, it is most appropriately placed in:

41. The presence of insectivory or parasitism in certain plants supports which classification principle?

42. A mushroom on a stump and a rust fungus on a living crop differ greatly in habitat and nutrition, yet both may belong to Basidiomycetes. Their common placement depends mainly on:

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

44. 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?

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

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

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

48. Healthy plants receive sap from diseased plants and later develop leaf curling and mosaic patterns. A control group receiving healthy sap remains normal. The strongest conclusion is:

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

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