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Microbes in Human Welfare Class 12 MCQs Questions with Answers
Multiple Choice Type Questions
Which of the following is a correct statement
(a) “Bt” in “Bt-cotton” indicates that it is a genetically modified organism produced through biotechnology.
(b) Somatic hybridization involves fusion of two complete plant cells carrying desired genes.
(c) The anticoagulant hirudin is being produced from transgenic Brassica napue seed.
(d) “Flavr savr” variety of tomato has enhanced the production of ethylene which improves its taste.
Answer: (c) The anticoagulant hirudin is being produced from transgenic Brassica napue seed.
Bacillus thuringiensis (Bt) strains have been used for designing novel
(b) Bio-metallurgical techniques
(c) Bio-mineralization processes
(d) Bio-insecticidal plants
Answer: (d) Bio-insecticidal plants
First biochemical to be produced commercially by microbial cloning and genetic engineering.
(a) Human insulin
(c) Pollen culture
(d) Fertility factor
Answer: (a) Human insulin
Cultivation of Bt-cotton has been much in the news. The prefix Bt means
(а) ‘Bariun treated’ cotton seeds
(b) ‘Bigger thread’ variety of cotton with better transgenic strength.
(c) Produced ‘by biotechnology’ using restriction enzymes and ligasses.
(d) Carrying an endotoxin gene from Bacillus thuringiensis.
Answer: (d) Carrying an endotoxin gene from Bacillus thuringiensis.
The first antibiotic was discovered by
(a) Louis Pasteur
(b) R. Koch
(d) A. Fleming
Answer: (d) A. Fleming
Integrated Pest Management (IPM) stands for
(a) Chemical control
(b) Biological control
(c) Host plant resistance
(d) Inegration of the above
Answer: (d) Inegration of the above
The micro-organism grown on molasses and sold as food flavouring substance is:
Answer: (a) Saccharomyces
Which one of the following is used in industrial preparation of ethanol?
Answer: (d) Saccharomyces
Yeast is an important source of
Answer: (b) Ribioflavin
Which one of the micro-organism is used for production of citric acid in industries?
(a) Lactobacillus bulgaricus
(b) Penicillum citrinum
(c) Aspergillus niger
(d) Rhizopus nigricans
Answer: (c) Aspergillus niger
Humulin is the term used for
(a) A new antibiotic
(b) A sex hormone
(c) Human insulin
(d) A vaccine
Answer: (c) Human insulin
Which of the following plants is used as biofertilizer?
Answer: (a) Nostoc
Drinking of mineral water with very low levels of pesticides (about 0.02ppm) for long period may
(a) produce immunity against mosquito
(b) cause leukemia in most people
(c) cause cancer of the intestine
(d) lead to accumulation of pesticide residues in body fat
Answer: (d) lead to accumulation of pesticide residues in body fat
One of the following is a biofertilizer
(d) Agent orange
Answer: (c) VAM
Biofertilisers give better yield when added along with
Answer: (a) Phosphate
Which one of the following plants are used as green manure in crop fields and in sandy soils?
(a) Crotalaria juncea and Alhagi camelorum
(b) Calotropis procera and Phyllanthus niruri
(c) Saccharum munja and Lantana camara
(d) Dichanthium annulatum and Azolla nilotica
Answer: (a) Crotalaria juncea and Alhagi camelorum
Cyanobacteria helps farmers by
(a) Reducing the alkalinity of the soil
(b) Reducing the acidity of the soil
(c) Neutralising the alkalinity of the soil
(d) Water logging
Answer: (b) Reducing the acidity of the soil
Due to which of the following organism, yield of rice is increased?
(b) Bacillus popilliae
(d) Bacillus polymena
Answer: (a) Anabaena
Which one of the following plant is commonly used as green manure
(a) Dalbergia sisso
(b) Acacia nilotica
(c) Cassia fistula
(d) Crotalarca juncea
Answer: (d) Crotalarca juncea
Crop rotation is used by farmers to increase
(a) Soil fertility
(b) Nitrogenous content of soil
(c) Organic content of soil
(d) All of these
Answer: (a) Soil fertility
Fill in the Blanks
Vam stands for ……………….
Answer: Vasicular Arbuscular Mycorrhizae
………………. is the association of fungi with root.
………………. produces ………………. in leguminous crops.
Answer: Rhizobium, nodules
………………. is the chemical substance that destroys weeds in cultivated patch.
……………… are examples of cyanobacteria.
Answer: Anabaena, Nostoc, Rivularia
The first organic acid to be produced industrially by fermentation was ……………….
Answer: Lactic acid
The micro-organism grown on molasses and sold as a food flavouring is ……………….
Answer: Baker’s yeast
Crops can also be protected from ………………. by the method of starvation.
It is estimated that green manures ………………. crop yield by 30 to 50 percent.
It takes about ………………. months to prepare the compost.
Answer: 6-8 months.
Write True or False
Legumes are fruits of plants of the pea family.
Mycorrhiza is the association of algae and fungi.
Biofertilizers are inorganic minerals which bring about enrichment of soil.
The bacterium Bacills th’uringensis produces protein toxins.
Indian soils are usually poor in organic matter and in nitrogen.
Anabaena is an excellent fertilizer for rice.
The residue of gobar gas plant is a kind of green manure.
Manures are partially decomposed organic materials added to the soil.
Azaadirachtin is an antifeedant compound present in neem extract.
Genetically produced human insulin is named Humulin.
One Word Questions
Name a biopesticide obtained from neem.
Name the organism that fixes nitrogen in association with Brazillian grass
Answer: Azospirillum Lipoferum.
Which bacterium contains insecticidal crystal protein- hurioside and kills a wide range of insects?
Answer: Bacillus thuringiensis.
Name the insecticides which are obtained from the roots of Derris elliptica.
Which symbiotic nitrogen-fixing cyanobacterium lives in association with Azolla?
Answer: Anabaena Azollae.
Name two types of fermentation processes.
Answer: Batch process and continuous process.
Formation of vinegar from alcohol is caused by what?
Answer: Acetobacter aceii.
Antibiotic terramycin is obtained from which organism?
Answer: Streptomyces ramosus.
Name an undistilled alcoholic beverage which is produced from fruit-juice fermentation.
Which enzyme is extracted from stomach of calf and used in cheese making.
Match the Following
|Column I||Column II|
|1. Azolla||A. Azospirillum|
|2. Maize||B. Mycorrbiza|
|3. Pea||C. Anabaena|
|4. Pine||D. Ashbya gossypii, Yeast|
|5. Citric acid||F. Rhizobium|
|6. Vitamin B12||G. Aspergillus niger|
|Column I||Column II|
|1. Azolla||C. Anabaena|
|2. Maize||A. Azospirillum|
|3. Pea||F. Rhizobium|
|4. Pine||B. Mycorrbiza|
|5. Citric acid||G. Aspergillus niger|
|6. Vitamin B12||D. Ashbya gossypii, Yeast|
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