The chemical obtained from Trichoderma polysporum is generally given to a person who

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Trichoderma polysporum produces a bioactive molecule, cyclosporin A, which is used as an immunosupressant in organ transplant patients.

Pectinase is added to commercial fruit juices to

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Pectinase help in removing the cloudiness. It does not increase the sugar content or the nutritional value.

Which of the following can convert nitrogen of the air into nitrates?

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Some bacteria called nitrogen fixing bacteria (Example: Rhizobium) can change the nitrogen of the air into nitrates. These bacteria are present in the root nodules of leguminous plants.

Which of the following bacteria is known for symbiotic association with legumes?

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Rhizobia is known for symbiotic association with legumes.

BCG vaccine gives immunity against ____.

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BCG vaccine gives immunity against tuberculosis.

A chemical substance produced by a microorganism which can stop the growth of another microorganism is called ____.

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A chemical substance produced by a microorganism which can stop the growth of another microorganism is called antibiotic.

Antibiosis is a type of interaction in which

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Antibiosis is a kind of interaction where one organism produces a chemical substance called an antibiotic which inhibits the growth of another organism.

____ is not obtained from bacteria.

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Penicillin is not obtained from bacteria. It is obtained from a fungus.

Which one the following is a 'clot buster'?

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Streptokinase obtained from Streptococcus bacteria helps in removing clots from the blood vessels of patients who have undergone myocardial infarction.

Pseudomonas is a ____.

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Pseudomonas is a denitrifying bacterium. It helps in converting soil nitrates into atmospheric nitrogen.

The process of biological nitrogen fixation was discovered by Dutch microbiologist Martinus Beijerinck.

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The process of biological nitrogen fixation was discovered by Dutch microbiologist Martinus Beijerinck in 1905.

Nitrogen fixing enzyme in the root nodule is ____.

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Nitrogen fixing enzyme in the root nodule is nitrogenase.

TAB vaccine ____.

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TAB vaccine is prepared from killed bacteria and gives immunity against typhoid. Synonym for typhoid-paratyphoid A and B vaccine.

An undistilled alcoholic beverage produced from grain fermentation is

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Whisky and rum are distilled alcoholic beverages produced from grain fermentation. Wine is an undistilled alcoholic beverage produced by fermentation of fruit juices. Beer is a undistilled alcoholic beverage produced by fermentation of grains/cereals.

Which among the following do not help in adding nitrogen to the soil?

Correct! Wrong!

Addition of lime in soil does not play any role in adding nitrogen to the soil.

Statins inhibiit the synthesis of cholesterol because

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Statins produced from yeast Monascus purpureus is a blood cholesterol lowering agent. It acts by competitively inhibiting the enzyme responsible for synthesis of cholesterol.

Antibiotics can be used against

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Antibiotics are not effective against viruses as its genetic material mutate to a greater extent. They can stop the growth of both bacteria and fungi.

Which of the following nitrogen fixing microorganisms is free living in soil?

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Azatobacter is a free living nitrogen fixing organism present in soil.

In the nitrogen cycle, nitrite is converted to nitrate by ____.

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In the nitrogen cycle, nitrite is converted to nitrate by nitrobacter.

The bulk of nitrogen in nature is fixed by symbiotic bacteria.

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The bulk of nitrogen in nature is fixed by lightning in which atmospheric oxygen and nitrogen combine to form nitrate and nitrite.

Which of the following statements is true?

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The true statement is - Pencillium notatum produces a chemical which inhibits the growth of Staphylococci.

Organisms that fix nitrogen in aquatic habitats are ____.

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Blue-green algae or cyanobacteria are known for aquatic nitrogen fixation.

Putrefaction is ____.

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Putrefaction is incomplete breakdown of organic matter by bacteria followed by emission of a foul smell.

The antibiotic streptomycin was discovered by ____.

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The antibiotic streptomycin was discovered by Waksman.

Which of the following is not a correct pair?

Correct! Wrong!

Clostridium butylicum produces butyric acid, and not benzoic acid.

The process of conversion of organic matter into ammonia by soil bacteria is called ____.

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The process of conversion of organic matter into ammonia by soil bacteria is called ammonification.

Which of the following statements is true?

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The true statement is - Nitrosomonas helps in converting ammonium salts into nitrites and Nitrobacter helps in converting nitrites into nitrates.

Which one of the following bacteria converts proteins to ammonia?

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Bacteria that convert proteins to ammonia in the nitrogen cycle are ammonifying bacteria.

While using a lipase enriched detergent for washing clothes, we should use

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Enzymes are very sensitive to temperature and pH. Hence while using detergents which have lipases, it is better to use water at room temperature, which will show maximum activity of the enzyme. At low temperatures, the enzyme will be inactive and it will get denatured at high temperatures. Adding salt will change the pH and hence the activity of the enzyme will be less.

The main gas produced in biogas plants due to bacterial actions is ____.

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The main gas produced in biogas plants due to bacterial action is methane.

ICSE Class 9th Biology - Importance of bacteria MCQs
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