Microbes in Human Welfare — practice questions
70 curated practice questions from Microbes in Human Welfare (Biology Class 12, CBSE) — 70 easy. Every question includes the final answer free; step-by-step worked solutions with a free account.
- Farmers have reported over 50% higher yields of rice by using which of the following biofertilizers?
- The inoculum is added to the fresh milk in order to convert milk into curd, the term ‘inoculum’ here refers to
- Study the following flowchart depicting the formation of curd from milk. Identify the missing parts A and B.
- Identify the blank spaces A, B, C and D in the following table and select the correct answer. Type of microbe…
- The reason that the chemical/synthetic fertilizers should be replaced by biofertilizers is that the former
- The chemical substances produced by some microbes which can kill or retard the growth of other microbes are called
- Which of the following statements is/are incorrect? (i) Cyanobacteria are autotrophic microbes widely distributed in…
- Which of the following statements regarding antibiotics is not correct? (i) Antibiotics are the attenuated…
- Which one of the following pairs is correctly matched?
- Monascus purpureus is a yeast commercially used in the production of
- Which of the following food items is produced by the fermenting activity of microbes? A. Idli B. Dosa C. Toddy D. Cheese
- Which of the following statements is not correct regarding mycorrhiza?
- Integrated Pest Management (IPM) discourages the excessive use of
- The given figure represents a typical biogas plant. Select the correct option for A, B and C respectively.
- Study the following statements regarding lactic acid bacteria (LAB) which are used to convert milk into curd. (i) They…
- During the primary treatment of sewage, solid particles that settle down are called
- When a natural predator (living organism) is applied on the other pathogen organisms to control them, this process is…
- Which of the following bacteria is present in the rumen of cattle?
- Fill up the blanks by selecting the correct option. (i) Biogas is a mixture of gases which predominantly contains…
- ________ produced by bacterium Streptococcus and modified by genetic engineering is used as a clot buster for removing…
- Which of the following statements is correct with regard to biocontrol agents?
- Which one of the following is not used as bio-fertilizer?
- Which one single organism or the pair of organisms is correctly assigned to its taxonomic group?
- Which of the following is not used as a biopesticide?
- Which of the following pathogens causes whooping cough?
- Identify the blank spaces A, B, C and D in the following table and select the correct answer. Type of microbe…
- The masses of bacteria held together by slime and fungal filaments to form mesh like structures are called as
- Which one of the following microorganisms forms symbiotic association with plants and helps them in their nutrition?
- The symbiotic association between fungi and roots of higher plants is referred to as
- Which of the following is a non-symbiotic biofertilizer?
- Wine and beer are produced directly by fermentation whereas brandy and whisky require both fermentation and…
- Refer the given flowchart of sewage treatment, accordingly match Column - I with Column - II and select the correct…
- Read the following statements and select the correct option. Statement 1 : Besides curdling of milk, LAB also improve…
- Read the following statements and select the correct option. Statement 1 : Biocontrol refers to the use of biological…
- Select the correct option to fill up the blanks. (i) _________ are used in detergent formulations and are helpful in…
- Given below is the flowchart of sewage treatment. Identify A, B, C and D, and select the correct option.
- Biofertilizers are organisms that enrich the nutrient quality of the soil. Which of the following can be used as…
- Biogas generation is a three stage anaerobic digestion of animal and other organic wastes. Study the following…
- Methanogens, growing anaerobically on cellulosic material, produce
- Read the following statements and select the correct option. Statement 1 : BOD represents the amount of dissolved…
- Identify the blank spaces A, B, C and D in the table given below and select the correct answer. Type of microbe…
- Statins used for lowering blood-cholesterol level are extracted from
- The technology of biogas production in India has been developed by the efforts of
- Which of the following antibiotics was extensively used to treat American soldiers wounded in World War II?
- These bacteria grow anaerobically on cellulosic material, produce large amount of methane along with CO 2 and H 2 , and…
- Unicellular symbiotic organisms improve yield of legumes by
- Match different organisms in Column - I with their uses in Column - II and select the correct answer from codes given…
- The purpose of biological treatment of waste water is to
- What would happen if oxygen availability to activated sludge flocs is reduced?
- Which of the following organisms is used in the production of beverages?
- A drug used for patient A is obtained from the organism B. Identify A and B in the above statement and select the…
- Which of the following is a mismatch with respect to the organism and the acid produced by it?
- Which of the following statements regarding baculoviruses as biocontrol agents is/are correct?
- Baculoviruses ( Nucleopolyhedrovirus ) do not show
- Trichoderma harzianum has proved to be a useful microorganism for
- Read the given statements and select the correct option. Statement 1 : Alcohol is a biotechnology product. Statement 2…
- BOD is ____ in polluted water and ____ in potable water.
- Which of the following is widely used as a successful biofertilizer in Indian rice fields?
- A microbial biocontrol agent that can be used to control butterfly caterpillars is
- A nitrogen fixing microbe associated with the fern Azolla in rice fields is
- Which of the following antibiotics is not correctly matched with the source from which it is obtained?
- Which one of the following combinations of organisms are responsible for the formation and flavour of yoghurt?
- In the sewage treatment, bacterial flocs are allowed to sediment in a settling tank. This sediment is called as
- Nitrogen fixation in root nodules of Alnus is brought about by
- Living organisms used to enrich the nutrient quality of the soil are called as
- A sewage treatment process in which a part of decomposer bacteria present in the wastes is recycled into the starting…
- Which of the following microbes is a proteinacious infectious agent?
- Azolla pinnata has been found to be an important bio-fertilizer for paddy crops. This quality is due to the presence of
- Study the following statements and select the incorrect ones. (i) Physical removal of large and small particles through…
- Select the correct statement regarding activated sludge formed during secondary sewage treatment.