biology mcqs
An extensive multiple-choice question test covering the diversity of the living world, biological classification systems, and detailed characteristics of the five kingdoms (Monera, Protista, Fungi, Plantae, and Animalia) including viruses, viroids, prions, and lichens, designed for competitive exam preparation.
Showing questions 41 - 60 of 168
41. Which eubacteria have chlorophyll 'a' similar to green plants and are photosynthetic autotrophs?
42. Some cyanobacteria can fix atmospheric nitrogen in specialised cells called:
43. Heterotrophic bacteria are mostly abundant in nature and are important as:
44. Which of the following diseases are caused by different bacteria?
45. Which organisms completely lack a cell wall and are the smallest living cells known, capable of surviving without oxygen?
46. All single-celled eukaryotes are placed under which kingdom?
47. Members of Protista are primarily:
48. Which group within Protista includes diatoms and golden algae (desmids)?
49. The cell walls of diatoms form two thin overlapping shells embedded with:
50. What is 'diatomaceous earth' primarily used for?
51. Which organisms are considered the chief ‘producers’ in the oceans?
52. The phenomenon where red dinoflagellates (e.g., *Gonyaulax*) undergo rapid multiplication, making the sea appear red, is known as:
53. Instead of a cell wall, Euglenoids have a protein-rich layer called:
54. Which of the following protists are saprophytic and form an aggregation called plasmodium under suitable conditions?
55. Which group of protozoans moves and captures prey by putting out pseudopodia?
56. *Trypanosoma*, a flagellated protozoan, causes which disease?
57. Which group of protozoans is known for having thousands of cilia and a gullet to steer food into the cell?
58. *Plasmodium*, the malarial parasite, belongs to which group of protozoans?
59. The unique kingdom of heterotrophic organisms that are cosmopolitan and prefer to grow in warm and humid places is:
60. With the exception of yeasts, fungi are filamentous, and their bodies consist of long, slender thread-like structures called: