12th Standard CBSE - Biology - Microbes in Human Welfare

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Question - 1

Which of the following is included in biopesticide?

  • A Viruses and bacteria
  • B Viruses, bacteria and fungi
  • C Viruses, bacteria, fungi, protozoa and mites
  • D Viruses, bacteria, fungi and protozoa

Question - 2

Which of the following can be controlled by using biopesticides?

  • A Insects
  • B Diseases
  • C Weeds
  • D All of them

Question - 3

Bacillus thuringiensis (Bt) strains have been used for designing novel

  • A Biofertilizers
  • B Bio-metallurgical techniques
  • C Bio-mineralization processes
  • D Bio-insecticidal plants

Question - 4

Bio fertilisers include:

  • A Blue-green algae, rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi
  • B Blue-green algae, rhizobia and other nitrogen fixings bacteria
  • C Rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi
  • D Blue green algae, rhizobia and mycorrhiza fungi

Question - 5

In which one of the following the BOD (Bio-chemical Oxygen Demand) of Sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order: 

  • A SE < PE < S < DE
  • B PE < S < SE < DE
  • C S < DE < PE < SE
  • D SE < S < PE < DE

Question - 6

Probiotics are

  • A Cancer inducing microbes
  • B New kind of food allergens
  • C Live microbial food supplement
  • D Safe antibiotics

Question - 7

Lactic acid is formed by the process of

  • A Actinomycetes fungi
  • B Rhizobium
  • C Azospirillum
  • D None of these

Question - 8

A good example of organic fertilizer which improves phosphorus uptake is

  • A Actinomycetes fungi
  • B Rhizobium
  • C Azospirillum
  • D None of these

Question - 9

What happened when we inoculated Rhizobium in wheat field?

  • A No increase in production (nitrogen content of soil remains same)
  • B A lot of increase in production (nitrogen content of soil increases)
  • C Fertility of soil decreases
  • D Fertility of soil increases.

Question - 10

Which of the following antibiotic is active against fungus?

  • A Streptomycin
  • B Polyenes
  • C Tetracycline
  • D Neomycin