Recent questions tagged class 12

Write the full form of the terms: 'ESTs' and 'SA' concerning to human genome project.

asked Apr 17, 2019 by priyanka.clay6

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What is the difference between RNAs and RNase ?

asked Apr 17, 2019 by priyanka.clay6

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Write the scientific name of the free living non pathogenic nematode used in Genomic Project study.

asked Apr 17, 2019 by priyanka.clay6

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What are the hotspots of DNA?

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List 2 significant contribution of Kornberg in the field of Genetics.

asked Apr 17, 2019 by priyanka.clay6

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Why do RNA viruses have high evolution rate?

asked Apr 17, 2019 by priyanka.clay6

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Which property of base pair sequences is exploited and applied in genetic engineering and biotechnology?

asked Apr 17, 2019 by priyanka.clay6

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What is the latest interest in human genomics ?

asked Apr 17, 2019 by priyanka.clay6

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If a double stranded DNA has 40% guanine calculate the % of adenine in the DNA.

asked Apr 17, 2019 by priyanka.clay6

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What is the difference between bio fertilizers and chemical fertilizers?

asked Apr 17, 2019 by priyanka.clay6

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What is the difference between primary and secondary treatment of sewage.

asked Apr 17, 2019 by priyanka.clay6

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How does primary sludge differ from activated sludge? What type of changes in the sludge is carried out in anaerobic sludge digester? Give the composition of biogas produced in the sewage treatment plant.

asked Apr 17, 2019 by priyanka.clay6

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What are statins? Name the microorganism that produces this substance. How is it medically important?

asked Apr 17, 2019 by priyanka.clay6

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What are biofertilisers? A farmer is advised to add a culture of bacterium in the soil beforesowing the crop. Name the bacterium in the culture. How is this bacterium useful to the crop?

asked Apr 17, 2019 by priyanka.clay6

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What is biochemical oxygen demand (BOD) test? At what stage of Sewage treatment this test isperformed? BOD level of three samples of water labelled as A, B and C are 30 mg/ L, 10mg/L and 500 mg/L respectively. Which sample of water is most polluted?

asked Apr 17, 2019 by priyanka.clay6

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Which Ministry of Govt. of India had initiated Ganga Action Plan and Yamuna Action Plan? What are the objectives of these plans?

asked Apr 17, 2019 by priyanka.clay6

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Give one example and one use of the following : i) Free living fungi ii) Symbiotic fungi iii) Free living bacteria

asked Apr 17, 2019 by priyanka.clay6

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For what significant properties the Baculoviruses are considered as best Biological control agent?. Mention its importance in organic farming.

asked Apr 17, 2019 by priyanka.clay6

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What are methanogens? How do they help to generate biogas?

asked Apr 17, 2019 by priyanka.clay6

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Cow dung and water is mixed and the slurry is fed into the biogas plant for digestion by microbes. The person performing the process shares that there is no need to provide inoculum for it. Why? What is the role of microbes at the source? Under which condition will they be most active and effective?

asked Apr 17, 2019 by priyanka.clay6

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State the medicinal value and the bioactive molecule produced by Streptococcus, Monascus and Trichoderma.

asked Apr 17, 2019 by priyanka.clay6

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How are flocs produced in the secondary treatment of the sewage? Explain their role.

asked Apr 17, 2019 by priyanka.clay6

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a) Baculoviruses are excellent candidates for integrated pest management in an ecologically sensitive area. Explain giving two reasons. (b) What is organic farming? Why is it suggested to switch over to organic farming ?

asked Apr 17, 2019 by priyanka.clay6

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An organic farmer relies on natural predation for controlling plant pests and diseases. Justify giving reasons why this is considered to be a holistic approach.

asked Apr 17, 2019 by priyanka.clay6

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Identify a, b, c, d, e and f in the table given below :

asked Apr 17, 2019 by priyanka.clay6

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a) How is activated sludge formed during sewage treatment ? (b) This sludge can be used as an inoculum or as a source of biogas. Explain.

asked Apr 17, 2019 by priyanka.clay6

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Explain the different step involved in sewage treatment before it can be released into natural water bodies.

asked Apr 17, 2019 by priyanka.clay6

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Name the genus to which baculoviruses belong. Describe their role in integrated pest management programmes.

asked Apr 17, 2019 by priyanka.clay6

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(a) Why do farmers prefer biofertilisers to chemical fertilisers these days? Explain. (b) How do Anabaena and mycorrhiza act as biofertilisers?

asked Apr 17, 2019 by priyanka.clay6

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Name the two different categories of microbes naturally occurring in sewage water. Explain their role in cleaning sewage water into usable water.

asked Apr 17, 2019 by priyanka.clay6

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Describe how biogas is generated from activated sludge. List the components of biogas.

asked Apr 17, 2019 by priyanka.clay6

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What does BOD of a water body stand for? How is it related to water pollution ?

asked Apr 17, 2019 by priyanka.clay6

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“Microbes play a dual role when used for sewage treatment as they not only help to retrieve usable water but also generate fuel Explain.

asked Apr 17, 2019 by priyanka.clay6

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Lactic Acid Bacteria (LAB) is commonly used in the conversion of milk into curd. Mention any two other functions of LAB that are useful to humans.

asked Apr 17, 2019 by priyanka.clay6

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Name two alcoholic drinks produced in each of the following ways. (i) by distillation and (ii) without distillation.

asked Apr 17, 2019 by priyanka.clay6

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Bacteria that convert effluent into activated sludge play one more beneficial side. Mention the role.

asked Apr 17, 2019 by priyanka.clay6

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It was observed that certain plant roots are infected by fungus. in spite of this infection the plant showed increased growth and development. Give reason.

asked Apr 17, 2019 by priyanka.clay6

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A farmer was suggested to apply certain microbial culture in his field to increase the yield. Suggest the types of microbes he could use in his paddy field and how do they help in increasing the yield.

asked Apr 17, 2019 by priyanka.clay6

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(a) Patients who have undergone myocardial infarction are given clot buster. Mention the clot buster administered and its microbial source. (b) A person recuperating from illness is advised to have curd regularly. Why?

asked Apr 17, 2019 by priyanka.clay6

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Explain the significant role of the genus Nucleopolyhedrovirus in an ecological sensitive area.

asked Apr 17, 2019 by priyanka.clay6

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Explain the process of secondary treatment given to the primary effluent up to the point it shows significant change in the level of biological oxygen demand (BOD) in it.

asked Apr 17, 2019 by priyanka.clay6

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During the secondary treatment of primary effluents, how does a significant decrease in BOD occur?

asked Apr 17, 2019 by priyanka.clay6

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Name the enzyme produced by Streptococcus bacterium. Explain its importance in medical sciences.

asked Apr 17, 2019 by priyanka.clay6

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Why are some molecules called bioactive molecules? Give two examples of such molecules.

asked Apr 17, 2019 by priyanka.clay6

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Name the source of statin and state its action on the human body.

asked Apr 17, 2019 by priyanka.clay6

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Name the source of streptokinase. How does this bioactive molecule function in our body?

asked Apr 17, 2019 by priyanka.clay6

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Why is Rhizobium categorised as a 'symbiotic bacterium'. How does it act as a biofertiliser?

asked Apr 17, 2019 by priyanka.clay6

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List four advantages that a symbiotic mycorrhizal association provides to the host plant.

asked Apr 17, 2019 by priyanka.clay6

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How does 'starter' added to milk help it set into curd?

asked Apr 17, 2019 by priyanka.clay6

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Name the bacterium responsible for the large holes in 'Swiss cheese'. What are these holes due to?

asked Apr 17, 2019 by priyanka.clay6

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