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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Microbes in Human Welfare of Biology.
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
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
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
54
Biogas can be good substitute for
[1]
fuel wood
[2]
coal
[3]
charcol
[4]
oil and petrol
55
Which of the following is a gram-negative bacterium?
[1]
Escherichia coli
[2]
Bacillus subtilis
[3]
Streptomyces coelicolor
[4]
Amycolatopsis orientalis
56
Organism like Escherichia coli and Chlamydia trachomatis fall into which domain?
[1]
Eukarya
[2]
Archaea
[3]
Bacteria
[4]
Animalia
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
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
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