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2022 questions

Biology · MICROBES IN HUMAN WELFARE

Consider the following statements regarding secondary sewage treatment and sludge processing: (A) The effluent is passed into aeration tanks where growth of aerobic microbes forms flocs. (B) The BOD of sewage is significantly reduced during the aeration tank process. (C) A small part of the activated sludge is pumped back into the aeration tank to serve as inoculum. (D) Anaerobic sludge digesters produce gases such as methane, hydrogen sulphide and carbon dioxide. How many of the above statements are correct?

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Biology · MICROBES IN HUMAN WELFARE

Consider the following statements about microbes and their characteristics: (A) Microbes include protozoa, bacteria, fungi and microscopic animal and plant viruses, viroids and prions. (B) Microbes like bacteria and fungi can be grown on nutritive media to form colonies that can be seen with the naked eyes. (C) Prions are proteinaceous infectious agents. (D) All microbes are pathogenic and cause harmful diseases in human beings. Which of the above statements are correct?

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