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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