NCERT - Microbes in Human Welfare Questions and Answers of Class 12 Biology | GkSeries

Questions
46 Which of the following is not used as a biopesticide?
1 Trichoderma harzianum
2 Bacillus thuringiensis
3 Xanthomonas campestris
4 Nuclear Polyhedrosis Virus (NPV)

Answer: Xanthomonas campestris
47 Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct?
1 Clostridium butylicum - lactic acid
2 Aspergillus niger - citric acid
3 Yeast – statins
4 Acetobacter aceti - acetic acid

Answer: Clostridium butylicum - lactic acid
48 Which one of the following plant is commonly used as green manure ?
1 Cassia fistula
2 Acacia nilotica
3 Dalbergia sissoo
4 Crotalaria juncea

Answer: Crotalaria juncea
49 Cyanobacteria serves as important biofertilizers in the fields of
1 Rice
2 Maize
3 Wheat
4 Sugar cane

Answer: Wheat
50 Which of the following is wrongly matched?
1 Aloe – Medicine
2 Petunia – Fumigatory
3 Sesbania – Fodder
4 Asparagus – Vegetable

Answer: Petunia – Fumigatory
51 Antibiotics mostly obtained from
1 algae
2 fungi
3 actinomycetes
4 both b and c

Answer: both b and c
52 Method of controlling pest that relies on natural predation rather than introduced chemical
1 Predation
2 Chemical control
3 Biological control
4 None of these

Answer: Biological control
53 . ----- serves as an important biofertlizer in paddy field
1 Cyanobacteria
2 Clostridium
3 Mycorrhiza
4 Frankia

Answer: Cyanobacteria
54 Biogas can be good substitute for
1 fuel wood
2 coal
3 charcol
4 oil and petrol

Answer: fuel wood
55 Which of the following is a gram-negative bacterium?
1 Escherichia coli
2 Bacillus subtilis
3 Streptomyces coelicolor
4 Amycolatopsis orientalis

Answer: Escherichia coli
56 Organism like Escherichia coli and Chlamydia trachomatis fall into which domain?
1 Eukarya
2 Archaea
3 Bacteria
4 Animalia

Answer: Bacteria
57 From which microorganism streptomycin is prepared?
1 Sterptomyces ramous
2 Sterptomyces antibiotics
3 Sterptomyces nodosus
4 Sterptomyces griseus

Answer: Sterptomyces griseus
58 The bacteria that grow on milk and convert it to curd
1 Clostridium
2 Lactobacillus
3 Nitosomonas
4 Acetobacter

Answer: Lactobacillus
59 The microbe that used in control of oil spills
1 Methanobacterium
2 Rhizobium
3 Pseudomonas putida
4 Bacillus thuringiensis

Answer: Pseudomonas putida
60 The free living fungus used as a biological control against several fungal pathogen of plants
1 Trichoderma
2 Pencillium
3 Frankia
4 Saccharomyces

Answer: Trichoderma

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