A student as a part of his project visited a software company and was surprised to see a sewage treatment plant set up there. He wonders at the role of microbes in one of its steps and specifies it in his project.
(a)How would he ave described the role of microbes in sewage treat ent plants?
(b) What would he say was the intention of such a set up?
(c)What value would he have imbibed from there

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?

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?

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?

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?