Sampling Microbes for Lab Observation — NEET Biology
📚 Practice ConceptBacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes with the help of a microscope, which sample would you carry and why?
Which of the following statements are correct regarding Biochemical Oxygen Demand (BOD) in the context of sewage treatment and water pollution? S1: BOD is a direct measure of the concentration of dissolved oxygen available for aquatic life in a given water sample. S2: The greater the BOD of waste water, the higher is its polluting potential due to excessive consumption of oxygen by microbes. S3: During secondary sewage treatment, aerobic microbes reduce the BOD by consuming the organic matter present in the primary effluent. S4: The BOD test essentially quantifies the amount of organic matter that can be oxidized by microorganisms in one liter of water. S5: Untreated sewage typically has a lower BOD value compared to secondary effluent because it contains less organic matter.
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