AIIMS Botany Microbes In Human Welfare Class 12 Questions

Match the following:

Which of the following is correct about biogas –

Assertion: The uptake of DNA during transformation is an active, energy requiring process. Reason: Transformation occurs only in those bacteria, which possess the enzymatic machinery involved in the active uptake and recombination.

Methanobacterium are methane-producing organisms that feed on carbon compounds like cellulose to produce methane gas. This process occurs in anaerobic conditions.

Match Column-I (microbes) to the Column-II (biological products) and select the option having correct matching.

Select the correct one –

Assertion: Besides curdling of milk, LAB also improve its nutritional quality, by increasing vitamin – B₁₂. Reason: LAB check disease causing microbes when it is present in human stomach.

The antibiotics have no effect on viruses because

Which of the following microbes is correctly paired with its function?

Which of the following statements is incorrect regarding fermentation?

Which of the following statements is correct?

Assertion : Amount of organic biodegradable compounds present in water is measured by the BOD of that water. Reason : During biodegradation of biodegradable organic compounds, oxygen is released by bacteria.

Select the correct statement.

Biological Oxygen Demand (BOD) is a measure of:

Azolla is used as a biofertilizer because it

Assertion : Yeasts such as Saccharomyces cerevisiae are used in baking industry. Reason : Carbon dioxide produced during fermentation causes bread dough to rise by thermal expansion.

Cyclosporine is used as

In 1929, a scientist discovered an antibiotic which was found very effective. The name of the scientist and the antibiotic, respectively are

Cyanobacteria helps farmers by

Assertion: Fruit juices taste bitter on being kept for some time. Reason: Microorganisms of the air spoil it quickly.