CBSE 12th Standard Biology Subject Microbes in Human Welfare Value Based Questions 5 Marks Questions With Solution 2021
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CBSE 12th Standard Biology Subject Microbes in Human Welfare Value Based Questions 5 Marks Questions With Solution 2021
12th Standard CBSE
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Reg.No. :
Biology
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During morning walk one day, Hemant asked his uncle, who was a plant pathologist, that he wanted to control plant pests as these were destroying his garden.But, he did not want to use chemicals due to their long-term harmful effect on the environment.His uncle suggested him to go for biological control methods.
Read the above passage and answer the following questions:
(i) What are biopesticides?
(ii) Name any biological control agent that helps to control mosquito larvae.
(iii) What value is displayed by Hemant?(a) -
Rahul was not getting a good yield from the fields but his neighbours used to apply fertilizers to get higher yields of different crops.He consulted an agricultural scientist, living in the neighbouring town, to suggest some cheap and eco-friendly method to boost crop production.The scientist suggested him to use biofertilizers.
(i) What are bio fertilisers?
(ii) Name two examples of bio fertilisers.
(iii) Why did scientist advise Rahul to use bio fertilisers?(a) -
Mohan's neighbour suffered from kidney failure and his life was in danger.Doctors advised him to get kidney transplanted immediately.His wife was willing to donate one of her kidneys but she was in dilemma due to low success rate as a result of the immune reaction.She expressed her fear to a doctor who removed her doubts by telling her about the availability of immunosuppressive agents.Read the above passage and answer the following questions:
(i) What are immunosuppressive agents?
(ii) Name one immunosuppressive agent and its source.
(iii) What value is displayed by doctor?(a) -
Protein is an important constituent of our food and its deficiency leads to many health problems.A large population of developing countries can not afford pulses.Ramesh learnt that many so he thought of culturing these microorganisms to provide a cheap source of proteins.
Read the above passage and answer the following questions:
(i) What are single cell protein (SCP)?
(ii) Name two microorganisms which provide SCP.
(iii) Why did Ramesh want to culture microorganisms?(a) -
During recent years many disease resistant crops plants have been released and many chemical pesticides have also been used to control the pest and diseases, so as to improve the agricultural yield. But such methods of pest and disease management have led to the development of 'super pests and super weeds' which require more scientific methods to control them
Answer the following questions on the basis of above information:
(i) Should we continue such a practice of pest and disease management?
(ii) What other method should be adopted to keep the pest and diseases at managable level so as to enhance the agricultural yield?
(iii) What value have not been kept in mind in the above case.(a)
5 Marks
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CBSE 12th Standard Biology Subject Microbes in Human Welfare Value Based Questions 5 Marks Questions With Solution 2021 Answer Keys
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(i) Biopesticides are the pesticides of biological origin or the biological control agents which are used to control the pests.
(ii) Gambusia fish
(iii) Hemant was concerned about the environment -
(i) Biofertilisers are the microorganisms which bring about soil nutrient enrichment, maximise ecological benefits and minimise environmental hazards.
(ii) Nostoc, Anabaena.
(iii) The scientist was concerned about the clean environment and, therefore, he suggested Rahul to use the ecofriendly technique. -
(i) These are the substances used during transplant which suppress the immune system of the recipient so that the transplanted organ is not rejected due to incompatibility between donor and recipient.
(ii) Cyclosporin A; Trichoderma (fungus)
(iii) Doctor educated the patient's wife and removed her doubts. -
(i) SCP refers to the large-scale production of protein obtained from unicellular or filamentous microorganisms.
(ii) Spirulina, Chlorella.
(iii) He was concerned about the welfare of the society. -
(i) No doubt such practice helps in the management of pest and diseases but at the same time have some adverse side effects too. Therefore such practices should be used judiciously after proper scrutinisation so that harm to the environment is minimum and agricultural output is maximum.
(ii) Biocontrolmethods of pest and disease management should be preferred. It is a natural method of pest and pathogen control. It involves the use of microorganisms or other natural predaters or their product for controlling the plant diseases. e.g. the fungus Trichoderma exerts biocontrol over several plant pathogens. Their biocontrol agents are specific and unlike chemical pesticides do not harm the useful non target organisms and keep the pest and ecological balance managable.
(iii) Ethical values with regard to the safety of environment have been neglected in this case.
5 Marks
