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MCQ for Full Syllabus Biology Microbes In Human Welfare
Full Syllabus Biology students should refer to the following multiple-choice questions with answers for Microbes In Human Welfare in Full Syllabus. These MCQ questions with answers for Full Syllabus Biology will come in exams and help you to score good marks
Microbes In Human Welfare MCQ Questions Full Syllabus Biology with Answers
Question: Trichoderma polysporum is a source of
- a) Cyclosporin-A
- b) Streptokinase
- c) Statins
- d) Clot buster
Answer: Cyclosporin-A
Question: Select the incorrect match
- a) Citric acid – Aspergillus flavus
- b) Clot buster – Streptococcus
- c) Cyclosporin A – Trichoderma
- d) Butyric acid – Clostridium butylicum
Answer: Citric acid – Aspergillus flavus
Question: Which fungal extract was extensively used in treating wounded American soldiers in world war-II?
- a) Penicillin
- b) Streptomycin
- c) Aflatoxin
- d) Gluconic acid
Answer: Penicillin
Question: The greater BOD of waste water relates
- a) Decreases oxygen content of water
- b) All of these
- c) Decreases oxygen content of water
- d) The decrease of temperature of water
Answer: Decreases oxygen content of water
Question: Ganga Action Plan for controlling pollution in Ganges started in
- a) 1985
- b) 1981
- c) 1987
- d) 1989
Answer: 1985
Question:
- a) The greater the BOD of waste water, less is its polluting potential
- b) The BOD test is a measure of the organic matter present in the water
- c) It refers to the amount of oxygen that would be consumed if all the organic matter in one liter of water were oxidised by bacteria
- d) Waste water is treated till BOD is reduced significantly
Answer: The greater the BOD of waste water, less is its polluting potential
Question: The Ministry of Environment and Forest has initiated Ganga action plan and Yamuna action plan
(i) To save these major rivers of our country from pollution
(ii) It is proposed to build a large number of sewage treatment plants
(iii) Under these plans, only treated sewage may be discharged in the river
- a) All are correct
- b) (ii) and (iii) are correct
- c) (i) and (ii) are correct
- d) (i) and (iii) are correct
Answer: All are correct
Question: Secondary treatment of sewage
- a) Involves microbial digestion of organic matter
- b) Does not require aeration
- c) Involves shredding, churning, filtration and sedimentation
- d) Removes grit and large pieces of organic matter
Answer: Involves microbial digestion of organic matter
Question: The removal of floating and suspended solids from sewage through filtration and sedimentation is the part of
- a) Primary treatment
- b) Secondary treatment
- c) Tertiary treatment
- d) Biological treatment
Answer: Primary treatment
Question: Biogas contains
- a) 50% – 70% Methane
- b) 30% – 40% Methane
- c) 50% – 70% CO2
- d) 20% Methane
Answer: 50% – 70% Methane
Question: First step in biogas production is carried out with the help of
- a) Decomposers
- b) Obligate aerobes
- c) Methanogens
- d) Parasites
Answer: Decomposers
Question: Identify the incorrect statement w.r.t. biogas plant
- a) A floating cover is placed over the slurry, which keeps on rising as the gas is consumed in the tank
- b) It has an outlet, which is connected to pipe to supply biogas to nearby houses
- c) The spent slurry is removed and may be used as fertiliser
- d) It consists of a concrete tank, 10-15 feet deep in which bio-wastes are collected and a slurry of dung is fed
Answer: A floating cover is placed over the slurry, which keeps on rising as the gas is consumed in the tank
Question: Identify the incorrect statement w.r.t. biogas plant
- a) A floating cover is placed over the slurry, which keeps on rising as the gas is consumed in the tank
- b) It has an outlet, which is connected to pipe to supply biogas to nearby houses
- c) The spent slurry is removed and may be used as fertiliser
- d) It consists of a concrete tank, 10-15 feet deep in which bio-wastes are collected and a slurry of dung is fed
Answer: A floating cover is placed over the slurry, which keeps on rising as the gas is consumed in the tank
Question: Find the correct option (w.r.t. Bioherbicide)
- a) More than one option is correct
- b) Helianthus annus
- c) Cactoblastis cactorum
- d) Phytophthora palmivora
Answer: More than one option is correct
Question: Which of the following is included in biopesticide?
- a) Viruses, bacteria, fungi and protozoa
- b) Viruses and bacteria only
- c) Viruses, bacteria and fungi only
- d) Viruses, bacteria, fungi and protozoa only
Answer: Viruses, bacteria, fungi and protozoa
Question: Baculoviruses are/have
- a) Pathogens that attack insects and other arthropods
- b) Members of genus Nucleopolyhedrovirus that are never used as biocontrol
- c) Species-specific, broad spectrum insecticides
- d) Few negative impacts on plants, mammals, birds, fishes or even on non-target insects
Answer: Pathogens that attack insects and other arthropods
Question: Identify the incorrect statement
(i) Bacillus thuringiensis are available in sachets as dried spores which are mixed with kerosine and sprayed on to vulnerable plants
(ii) B. thuringiensis are used to control butterfly caterpillars, but leave other insects unharmed
(iii) The toxin of B. thuringiensis is released in the blood of larvae and the larvae get killed
(iv) By the development of methods of genetic engineering B. thuringiensis toxin genes have been introducedinto plants
- a) (i) and (iii)
- b) (ii) and (iv)
- c) (ii) and (iii)
- d) (i) and (ii)
Answer: (i) and (iii)
Question: Which of the following are natural insecticides?
(a) Rotenone (b) Pyrethrum
(c) Nicotine (d) Azadirachtin
- a) (a), (b), (c) & (d)
- b) (a) & (b) only
- c) (a), (c) & (d) only
- d) (a), (b) & (c) only
Answer: (a), (b), (c) & (d)
Question: Biofertilisers include
- a) Blue-green algae, Rhizobium, other nitrogen-fixing bacteria and mycorrhiza
- b) Blue-green algae, Trichoderma, Rhizobium and other nitrogen-fixing bacteria
- c) Rhizobium, other nitrogen-fixing bacteria, NPV and mycorrhiza
- d) Blue-green algae, Rhizobium, Bt and mycorrhiza
Answer: Blue-green algae, Rhizobium, other nitrogen-fixing bacteria and mycorrhiza
Question: Which of the following is not a symbiotic nitrogen fixing bacterium?
- a) Clostridium
- b) Frankia
- c) Rhizobium leguminosarum
- d) Mycobacterium
Answer: Clostridium
Question: Which of the following is not the belief of an organic farmer?
- a) For controlling plant diseases and pests, chemicals like insecticides and pesticides should be used extensively
- b) Eradication of the pests is undesirable because they act as food or hosts for beneficial predatory and parasitic insects
- c) The insects that are sometimes called pests are not eradicated, but instead are kept at manageable levels by a complex system of checks and balances within a living and vibrant ecosystem
- d) The more variety a landscape has, the more sustainable it is
Answer: For controlling plant diseases and pests, chemicals like insecticides and pesticides should be used extensively
More Questions.....................................
Question: Organisms called Methanogens are most abundant in a
- a) Cattle yard
- b) Polluted stream
- c) Sulphur rock
- d) Hot spring
Answer: Cattle yard
Question: Secondary sewage treatment is mainly a
- a) Biological process
- b) Physical process
- c) Mechanical process
- d) Chemical process
Answer: Biological process
Question: Which of the following is mainly produced by the activity of anaerobic bacteria on sewage ?
- a) Marsh gas
- b) Laughing gas
- c) Propane
- d) Mustard gas
Answer: Marsh gas
Question: Continuous addition of sugars in 'fed batch' fermentation is done to
- a) Purify enzymes
- b) Obtain antibiotics
- c) Produce methane
- d) Degrade sewage
Answer: Purify enzymes
Question: Ethanol is commercially produced through a particular species of
- a) Saccharomyces
- b) Clostridium
- c) Aspergillus
- d) Trichoderma
Answer: Saccharomyces
Question: The most common substrate used in distilleries for the production of ethanol is
- a) Molasses
- b) Corn meal
- c) Soya meal
- d) Ground gram
Answer: Molasses
Question: Which one of the following is not a biofertilizer ?
- a) Agrobacterium
- b) Rhizobium
- c) Nostoc
- d) Mycorrhiza
Answer: Agrobacterium
Question: An organism used as a biofertilizer for raising soyabean crop is
- a) Rhizobium
- b) Azospirillum
- c) Azotobacter
- d) Nostoc
Answer: Rhizobium
Question: Consider the following statements (A-D) about organic farming
A. Utilizes genetically modified crops like Bt cotton.
B. Uses only naturally produced inputs like compost.
C. Does not use pesticides and urea.
D. Produces vegetables rich in vitamins and minerals.
Which of the above statements are correct ?
- a) (B) and (C) only
- b) (A) and (B) only
- c) (B), (C) and (D)
- d) (C) and (D) only
Answer: (B) and (C) only
Question: Select the correct statement from the following
- a) Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria
- b) Biogas is produced by the activity of aerobic bacteria on animal waste
- c) Methanobacterium is an aerobic bacterium found in rumen of cattle
- d) Biogas, commonly called gobar gas, is pure methane
Answer: Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria
Question: An example of endomycorrhiza is
- a) Glomus
- b) Nostoc
- c) Agaricus
- d) Rhizobium
Answer: Glomus
Question: A common biocontrol agent for the control of plant diseases is
- a) Trichoderma
- b) Baculovirus
- c) Bacillus thuringiensis
- d) Glomus
Answer: Trichoderma
Question: Which one of the following is not used in organic farming?
- a) Snail
- b) Glomus
- c) Earthworm
- d) Oscillatoria
Answer: Snail
Question: Which of the following is not used as a biopesticide?
- a) Xanthomonas campestris
- b) Trichoderma harzianum
- c) Nuclear Polyhedrosis Virus (NPV)
- d) Bacillus thuringiensis
Answer: Xanthomonas campestris
Question: Which one of the following proved effective for biological control of nematodal disease in plants?
- a) Pseudomonas cepacia
- b) Pisolithus tinctorius
- c) Gliocladium virens
- d) Pseudomonas cepacia
Answer: Pseudomonas cepacia
Question: Modern detergents contain enzyme preparations of
- a) Acidophiles
- b) Thermophiles
- c) Alkaliphiles
- d) Thermoacidophiles
Answer: Acidophiles
Question: Trichoderma harzianum has proved a useful microorganism for
- a) Biological control of soil-borne plant pathogens
- b) Reclamation of wastelands
- c) Bioremediation of contaminated soils
- d) Gene transfer in higher plants
Answer: Biological control of soil-borne plant pathogens
Question: Probiotics are
- a) Live microbial food supplement
- b) Safe antibiotics
- c) New kind of food allergens
- d) Cancer inducing microbes
Answer: Live microbial food supplement
Question: Which one of the following pairs is wrongly matched?
- a) Coliforms – Vinegar
- b) Yeast – Ethanol
- c) Methanogens – Gobar gas
- d) Streptomycetes – Antibiotic
Answer: Coliforms – Vinegar
Question: Bacillus thuringiensis (Bt) strains have been used for designing novel
- a) Bio-insecticidal plants
- b) Bio-metallurgical technique
- c) Bio-mineralization processes
- d) Bio-fertilizers
Answer: Bio-insecticidal plants
Question: A good producer of citric acid is
- a) Aspergillus
- b) Saccharomyces
- c) Clostridium
- d) Pseudomonas
Answer: Aspergillus
Question: Which one of the following pairs is wrongly matched?
- a) Alcohol - nitrogenase
- b) Textile - amylase
- c) Detergents - lipase
- d) Fruit juice - pectinase
Answer: Alcohol - nitrogenase
Question: Gobar gas contains mainly
- a)
- b)
- c)
- d) None of these
Answer:
Question: Which bacteria is utilized in gober gas plant?
- a) Methanogens
- b) Nitrifying bacteria
- c) Denitrifying bacteria
- d) Ammonifying bacteria
Answer: Methanogens
Question: During anaerobic digestion of organic waste, such as in producing biogas, which one of the following is left undegraded ?
- a) Lignin
- b) Hemi-cellulose
- c) Cellulose
- d) Lipids
Answer: Lignin
Question: A major component of gobar gas is
- a) Methane
- b) Ethane
- c) Butane
- d) Ammonia
Answer: Methane
Question: Which one of the following is an example of carrying out biological control of pests/diseases using microbes?
- a) Bt-cotton to increase cotton yield
- b) Lady bird beetle against aphids in mustard
- c) Trichoderma sp. against certain plant pathogens
- d) Nucleopolyhedrovirus against white rust in Brassica
Answer: Bt-cotton to increase cotton yield
Question: One of the major difficulties in the biological control of insect/pest is that
- a) The predator does not always survive when transferred to a new environment
- b) The predator develops a preference to other diets and may itself become a pest
- c) The predator develops a preference to other diets and may itself become a pest
- d) None of these
Answer: The predator does not always survive when transferred to a new environment
Question: Cochineal insects have proved very useful for the control of
- a) Cactus
- b) Eicchornia
- c) Weeds
- d) Parthenium
Answer: Cactus
Question: When a natural predator (living being) is applied on the other pathogen organism to control them, this process is called
- a) Biological control
- b) Artificial control
- c) Confusion technique
- d) Genetic engineering
Answer: Biological control
Question: Which of the following is not used as a biopesticide?
- a) Xanthomonas campestris
- b) Trichoderma harzianum
- c) Bacillus thuringiensis
- d) Nuclear Polyhedrosis Virus (NPV)
Answer: Xanthomonas campestris
Question: A common biocontrol agent for the control of plant diseases is
- a) Trichoderma
- b) Bacillus thuringiensis
- c) Baculovirus
- d) Glomus
Answer: Trichoderma
Question: Farmers have reported over 50% higher yields of rice by using which of the following biofertilizer?
- a) Azolla pinnata
- b) Legume-Rhizobium symbiosis
- c) Cyanobacteria
- d) Mycorrhiza
Answer: Azolla pinnata
Question: Which one of the following helps in absorption of phosphorus from soil by plants?
- a) Glomus
- b) Anabaena
- c) Rhizobium
- d) Frankia
Answer: Glomus
Question: Which of the following fern is an excellent biofertilizer?
- a) Azolla
- b) Pteridium
- c) Marsilea
- d) Salvinia
Answer: Azolla
Question: Due to which of the following organism, yield of rice is increased?
- a) Anabaena
- b) Bacillus subtilis
- c) Bacillus popilliae
- d) Sesbania
Answer: Anabaena
Question: The biofertilizers are
- a) Anabaena and Azolla
- b) Quick growing crop ploughed under soil
- c) Cow dung, manure and farmyard waste
- d) None of these
Answer: Anabaena and Azolla
Question: Which of the following species does not have the ability to fix atmospheric nitrogen?
- a) Spirogyra
- b) Nostoc
- c) Anabaena
- d) Azotobactor
Answer: Spirogyra
Question: Due to which of the following organism, yield of rice is increased?
- a) Anabaena
- b) Bacillus subtilis
- c) Bacillus popilliae
- d) Sesbania
Answer: Anabaena
Question: Which of the following is a symbiotic nitrogen fixer?
- a) Frankia
- b) Azotobacter
- c) Glomus
- d) Azolla
Answer: Frankia
Question: An alga which can be employed as food for human being is
- a) Chlorella
- b) Ulothrix
- c) Spirogyra
- d) Polysiphonia
Answer: Chlorella
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