Biology chapter 20 Man and biology mcqs with answer

21. Malaria is caused by:

(a) Mosquito

(b) Protozoa✅

(c) Virus

(d) Bacteria

22. Roundworm causes:

(a) Aseariasis✅

(b) Trichomonas vaginitis

(c) (a) and (b)

(d) None

23. Which of the following kills micro-organisms:

(a) Radiation

(b) Heat

(c) Chemicals

(d) All above✅

24. Which of the following is an antibiotic:

(a) Penicillins

(b) Tetracyclines

(c) Erythromycin

(d) All above✅

25. Which of the following are pathogens:

(a) Bacteria    

(b) Virus

(c) Fungi    

(d) All above✅

26. Rain containing______is called acid rain  

(a) Sulfuric acid

(b) Nitric acid

(c) Both (a) and (b)✅   

(d) None  

27. Ozone filters which rays:

(a) V-rays    

(b) Beta-rays  

(c) Gamma rays✅

(d) IR rays  

28. Keeping of Honey bees is called:  

   

(a) Sericulture    

(b) Culture

(c) Poultry culture✅   

(d) None  

29. Rearing silkworms is know as:  

   

(a) Apiculture    

(b) Sericulture✅

(c) Poultry culture    

(d) None  

30. T.B. is common in:  

   

(a) Rainy areas✅    

(b) Subtropical area

(c) Tropical area    

(d) None of them  

31. Which Bacteria causes T.B.  

(a) Mycobacterium✅    

(b) Mycoplasm  

(c) Borderella    

(d) Conynibacterium  

32. BDG is used for:  

(a) T.B. vaccination✅    

(b) Polio vaccination  

(c) Diphtheria vaccination  

(d) None  

33. Cholera is caused by:  

   

(a) Mycobacterium    

(b) Vibrio✅

(c) B. anthraus    

(d) Borderella  

34. Rains containing acid, dissolve ______ salts in the soil and washes them into lakes and rivers:  

   

(a) Cromium    

(b) Aluminium✅

(c) Carbon    

(d) Chlorids  

35. The removal of top soil from one place to another due to wind, flood and heavy rain is called:

(a) Soil replacement 

(b) Soil loss  

(c) Soil erosion✅

(d) all above  

36. Micro-organisms causing diseases are called:  

(a) Pathogens✅

(b) Harmful  

(c) Useful

(d) Microgens  

37. The smallest disease causing particles, known to us are:  

   

(a) Bacteria 

(b) Protozone

(c) Fungi 

(d) Viruses✅

38. Largest organism to parasitize human beings is:  

   

(a) Tap worms✅

(b) Flat worms

(c) Round worms 

(d) None of them  

39. Body of tap worm is segmented and each segment is called:  

   

(a) Siolex 

(b) Rostellium

(c) Strobilis 

(d) Proglottide✅

40. House fly is a ______ vector:  

   

(a) Biological 

(b) Physical

(c) Mechanical✅

(d) Trangenic

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Biology chapter 20 Man and biology

1. A phenomenon, which is used for the transfer of genes from one organism to another, is called:

(a) Genetic Engineering✅

(b) Genetics

(c) (a) and (b)

(d) None

2. Vector used for the transfer of gene is usually:

(a) Plasmids✅

(b) Viral DNA

(c) Bacterial DNA

(d) All

3. Diseases caused by bacteria are:

(a) Polio and T.B

(b) Cholera and measles

(c) AIDS and Dysentery

(d) T.B and Cholera✅

4. Recycling of material is great advantage because it:

(a) Reduces waste disposal

(b) Reduces pollution

(c) Saves energy and money

(d) All above✅

5. Man brings undesirable changes in the environment and pollutes:

(a) The air

(b) The water

(c) The soil

(d) All above✅

6. The use of micro-organisms to make useful substances for man is called:

(a) Biology

(b) Genetics

(c) Biotechnology✅

(d) Genetic engineering

7. Micro-organisms include:

(a) Bacteria

(b) Fungi

(c) Viruses

(d) All above✅

8. The materials that can be split into simpler compounds are called:

(a) Biodegradable✅

(b) Decomposed

(c) Non-biodegradable

(d) (a) and (b)

9. Which of the following is recycled in nature:

(a) Carbon

(b) Oxygen

(c) Water

(d) All above✅

10. Pests can be controlled:

(a) Biologically

(b) Chemically

(c) Mechanically

(d) All above✅

11. Bringing of undesirable changes in the environment is called:

(a) Harsh changes

(b) Bad changes

(c) Pollution✅

(d) All above

12. Which of the following do forests supply:

(a) Oxygen

(b) Fruits

(c) Timber and medicine

(d) All above✅

13. Yeast ferments sugar into:

(a) Glucose

(b) Alcohol✅

(c) Spirite

(d) None

14. Dough flour rises due to:

(a) CO₂✅

(b) O₂

(c) Nitrogen

(d) None

15. Which of the following is a decomposer:

(a) Fungi

(b) Bacteria

(c) Both (a) and (b)✅

(d) All above

16. Which of the following are viral diseases?

(a) T.B and cholera

(b) T.B. and polio

(c) Measles and polio✅

(d) AIDS and T.B

17. AIDS is transmitted through:

(a) Sexual contact

(b) Syringes

(c) Blood transfusion

(d) All above✅

18. AIDS is caused by:

(a) HIV virus✅

(b) HBV virus

(c) HCV virus

(d) Picorno virus

19. Athlete's foot disease is caused by:

(a) Fungi✅

(b) Algae

(c) Bacteria

(d) Virus

20. Ringworm is caused by:

(a) Virus

(b) Bacteria

(c) Fungi✅

(d) Algae

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