Selected Qs - Biological Classification - NCERT Exemplar Converted to MCQs

1. The role of cyanobacteria in agricultural fields for crop improvement is primarily due to their ability to:

1.	Produce oxygen through photosynthesis
2.	Fix atmospheric nitrogen
3.	Control pest populations
4.	Increase soil acidity

2. A microscopic specimen showing unicellular organization, well-defined nucleus, and two flagella - one longitudinal and one transverse, most likely belongs to:

1.	Chrysophytes	2.	Dinoflagellates
3.	Euglenoids	4.	Protozoans

3. The five-kingdom classification system is superior to the two-kingdom system because it:

1.	Only includes plants and animals
2.	Classifies viruses also
3.	Considers cell structure, nutrition, and body organization
4.	Classifies organisms based only on morphology

4. High abundance of Nostoc and Oscillatoria in polluted water bodies is due to:

1.	Their ability to perform photosynthesis
2.	Their resistance to high temperatures
3.	Their ability to fix atmospheric nitrogen
4.	Their tolerance to high nutrient content

5. Chemosynthetic bacteria are classified as:
1. Heterotrophs
2. Photoautotrophs
3. Chemoautotrophs
4. Parasites

6. Which of the following characteristics of viruses makes them different from living organisms?

1.	Presence of protein coat
2.	Ability to reproduce
3.	Lack of cellular organization
4.	Presence of genetic material

7. In Whittaker's five-kingdom classification, the number of kingdoms showing eukaryotic cell organization is:
1. Two
2. Three
3. Four
4. Five

8. Which of these is NOT a criterion used in the five-kingdom classification system?

1.	Cell structure
2.	Mode of nutrition
3.	Geographical distribution
4.	Body organization

9. The cell wall of fungi is primarily composed of:
1. Cellulose
2. Chitin
3. Peptidoglycan
4. Protein

10. Why are diatoms referred to as 'pearls of the ocean'?

1.	They produce actual pearls
2.	They have silica-rich indestructible cell walls
3.	They are chief producers in oceans and reflect light like a pearl
4.	They appear like pearls under a microscope.

11. Which feature of Neurospora makes it an excellent model organism for genetic studies?

1.	Its rapid life cycle and easily observable traits
2.	Its ability to produce antibiotics
3.	Its symbiotic relationship with plants
4.	Its pathogenic nature

12. What justifies grouping cyanobacteria and heterotrophic bacteria together in Kingdom Monera?

1.	Both are photosynthetic
2.	Both are prokaryotic organisms
3.	Both have same mode of nutrition
4.	Both have identical cell wall composition

13. The diatomaceous earth is used in:
1. Agriculture as fertilizer
2. Medicine as antibiotics
3. Polishing and filtration
4. Food preservation

14. Which characteristic of Trypanosoma places it in Kingdom Protista?

1.	Presence of cell wall
2.	Prokaryotic cell structure
3.	Eukaryotic unicellular organization
4.	Photosynthetic ability

15. The 'fairy rings' formed by mushrooms are a result of:

1.	Supernatural activity
2.	Radial growth of underground mycelium
3.	Random spore dispersal
4.	Lightning strikes

16. What is the primary difference between coenocytic and septate hyphae?

1.	Presence vs absence of cell wall
2.	Presence vs absence of cross walls
3.	Branched vs unbranched structure
4.	Living vs dead cells

17. Which of these is NOT a characteristic of Kingdom Fungi?
1. Heterotrophic nutrition
2. Presence of chlorophyll
3. Cell wall made of chitin
4. Formation of mycelium

18. The most distinctive feature of dinoflagellates is:

1.	Silica-rich cell wall
2.	Presence of pellicle
3.	Two flagella in specific orientation
4.	Ability to fix nitrogen

19. Which group of protozoans causes malaria?
1. Amoeboid protozoans
2. Flagellated protozoans
3. Ciliated protozoans
4. Sporozoans

20. What feature distinguishes archaebacteria from eubacteria?

1.	Presence of cell wall
2.	Different cell wall structure
3.	Presence of flagella
4.	Method of reproduction

21. Which of these represents the correct sequence in classification systems?

1.	Two kingdom → Three kingdom → Five kingdom
2.	Three kingdom → Two kingdom → Five kingdom
3.	Two kingdom → Three domain→ Five kingdom
4.	Five kingdom → Two kingdom → Three domain

22. The most primitive form of nutrition in fungi is:
1. Parasitic
2. Symbiotic
3. Saprophytic
4. Autotrophic

23. Dinoflagellates are responsible for:
1. Green tides
2. Red tides
3. Brown tides
4. Blue tides

24. Which kingdom shows the most extensive metabolic diversity?
1. Monera
2. Protista
3. Fungi
4. Plantae

25. The cell wall of diatoms is made up of:
1. Cellulose
2. Chitin
3. Silica
4. Peptidoglycan

26. Which organism can switch between autotrophic and heterotrophic modes of nutrition?

1.	Amoeba	2.	Euglena
3.	Paramoecium	4.	Plasmodium

27. Mycoplasma differs from other bacteria in:
1. Having a rigid cell wall
2. Lacking a cell wall
3. Being multicellular
4. Being photosynthetic

28. The kingdom that forms an evolutionary link between plants, animals and fungi is:
1. Monera
2. Protista
3. Plantae
4. Fungi

29. The main criterion NOT used by Whittaker in his five kingdom classification was:
1. Cell structure
2. Body organization
3. Mode of nutrition
4. Habitat preference

30. In a lichen association, the fungal partner provides:

1.	Food through photosynthesis
2.	Protection and water absorption
3.	Oxygen for respiration
4.	Carbon dioxide for photosynthesis

31. Diatoms are called 'pearls of ocean' because:

1.	They have pearl-like appearance
2.	They have siliceous cell walls that sparkle like pearls
3.	They are found in deep ocean like pearls
4.	They produce pearl-like structures

32. What is diatomaceous earth?

1.	Soil rich in diatom fossils used as filtration medium
2.	A type of marine sediment
3.	Fossilized remains of marine animals
4.	A type of clay soil

33. Which fruiting body in ascomycetes is completely closed?
1. Apothecium
2. Perithecium
3. Cleistothecium
4. Basidium

34. Which fruiting body in ascomycetes is completely open?
1. Apothecium
2. Perithecium
3. Cleistothecium
4. Sporangium

35. The role of fungi in daily life includes all of the following EXCEPT:

1.	Bread making (yeast)
2.	Antibiotic production
3.	Decomposition of organic matter
4.	Photosynthesis

36. In lichen symbiosis, if the algal and fungal partners are separated:

1.	Both will survive and grow normally
2.	Both will die
3.	Algal component will survive while fungal component will die
4.	Fungal component will survive while algal partner will die

37. The relationship in lichen is called symbiosis because:

1.	Both partners benefit from the association
2.	One partner benefits while other is harmed
3.	One partner benefits while other is unaffected
4.	Both partners are harmed

38. In lichen, the fungal partner (mycobiont) provides:

1.	Carbohydrates through photosynthesis
2.	Shelter and absorbs water and minerals
3.	Oxygen for respiration
4.	Protection from herbivores only

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