All Free Biology MCQs with Answers

2761. _ are very good bioindicators of air quality as they are very sensitive to pollution.

• A. Lichens
• B. Mycorrhizae
• C. Rhizopus
• D. Penicillium

Explanation: Answer is "Lichens"Explanation: They are sensitive to air pollution particularly to SO2 and start dieing immediately if air becomes polluted.Lichens are very good bioindicators of air quality as they are very sensitive to pollution. Lichens are organisms that are formed by a symbiotic relationship between a fungus and an alga. They are found in a variety of environments, but they are particularly sensitive to air pollution.

2762. Bioremediation means:

• A. Degrading pollutants
• B. Removing pollutants
• C. Degrading or removing environmental poisons
• D. Degrading or removing environmental poisons or pollutants by organisms

Explanation: Answer is "Degrading or removing environmental poisons/pollutants by organisms"Explanation: Degrading or removing environmental poisons/pollutants by organisms is called bioremediation.

2763. Give an example of edible fungi:

• A. Agaricus sp.
• B. Tuber sp.
• C. Morchella esculenta
• D. Agaricus sp., Morchella esculenta and Tuber sp.

Explanation: Answer is "Agaricus sp., Morchella esculenta and Tuber sp."Explanation: All of them are edible.

2764. Give an example of poisonous mushrooms:

• A. Death cap/death angel
• B. Saccharomyces cerevisiae
• C. Jack - O Lantern
• D. Death cap/death angel and Jack - O Lantern

Explanation: Answer is "Death cap / death angel and Jack O Lantern"Explanation: These are poisonous fungi having strong neurotoxins.

2765. Some species of _ are used for producing soya sauce and soya paste from soya beans.

• A. Penicillium
• B. Aspergillus
• C. Yeast
• D. Neurospora

Explanation: Answer is "Aspergillus"Explanation: It produces some highly proteolytic enzymes which breakdown the grain proteins

2766. Penicillin is dominated from:

• A. Saccharomyces cerevisiae
• B. Penicillium griseofulvum
• C. Penicillium notatum
• D. Neurospora crassa

Explanation: Answer is "Penicillium notatum"Explanation: Historically it happened so.

2767. It is used in organ transplantation to prevent transplant rejection:

• A. Lovastatin
• B. Cyclosporine
• C. Penicillium
• D. Griseofulvin

Explanation: Answer is "Cyclosporine"Explanation: It is an immunosupressent.

2768. Lovastatin is used for:

• A. Lowering blood cholesterol
• B. Relief in migraine
• C. Preventing transplant rejection
• D. Inhibiting fungal growth

Explanation: Answer is "Lowering blood cholesterol"Explanation: It is an inhibitor of that enzyme which is associated with cholesterol anabolism.

2769. Griseofulvin is used for:

• A. Lowering blood cholesterol
• B. Relief in migraine
• C. Preventing transplant rejection
• D. Inhibiting fungal growth

Explanation: Answer is "Inhibiting fungal growth"Explanation: It makes the cells resistant to fungal infections.

2770. Massive quantities of antibiotics are being prepared and used, which are followed by the widespread problems of:

• A. Drug resistance in microorganisms
• B. Drug addiction in microorganisms
• C. Drug sensitivity in microorganisms
• D. Intoxication in human being

Explanation: Answer is "Drug resistance in microorganisms"Explanation: Widespread use of antibiotics and easy availability are causes of increased microbial resistance against antibiotics.