biology : class12 Agricultural Waste Substrates : Definition, Sources, Nutritional Importance : Single Cell Protein MCQ Questions and Answers
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Agricultural Waste Substrates
MCQ questions and answers.
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MCQ Questions
1. Which of the following is an agricultural waste that can be used as a substrate for producing single-cell protein?
A.
Wheat straw
B.
Plastic bags
C.
Glass pieces
D.
Metal sheets
Correct Answer:
Wheat straw
Explanation:
Wheat straw is an agricultural waste rich in organic matter that can serve as a substrate for microbial growth during single-cell protein production.
2. Rice bran is used in single-cell protein production mainly because it is a useful source of:
A.
Organic nutrients for microbial growth
B.
Pure metallic elements
C.
Synthetic polymers
D.
Inorganic glass
Correct Answer:
Organic nutrients for microbial growth
Explanation:
Rice bran is an agricultural by-product containing nutrients that support the growth of microorganisms used to produce single-cell protein.
3. Which agricultural waste from sugar production can be used as a substrate for microbial biomass production?
A.
Sugarcane bagasse
B.
Aluminium foil
C.
Broken ceramic
D.
Rubber tubing
Correct Answer:
Sugarcane bagasse
Explanation:
Sugarcane bagasse is the fibrous residue left after extracting juice from sugarcane and can be used as an agricultural waste substrate for microbial growth.
4. Which of the following is an example of a crop-processing residue that may be used for single-cell protein production?
A.
Rice husk
B.
Coal dust
C.
Cement powder
D.
Plastic foam
Correct Answer:
Rice husk
Explanation:
Rice husk is a residue of rice processing and can be treated and used as an agricultural waste substrate for cultivating suitable microorganisms.
5. Agricultural wastes are used as substrates in single-cell protein production because they are generally:
A.
Abundant and rich in organic matter
B.
Made entirely of metals
C.
Unable to support microbial growth
D.
Composed only of water
Correct Answer:
Abundant and rich in organic matter
Explanation:
Agricultural wastes are widely available and contain organic materials that microorganisms can utilize for growth and biomass formation.
6. Which agricultural by-product can provide a suitable substrate for microorganisms used in single-cell protein production?
A.
Wheat bran
B.
Iron wire
C.
Glass powder
D.
Nylon fabric
Correct Answer:
Wheat bran
Explanation:
Wheat bran is a nutrient-containing agricultural by-product that can support microbial growth in single-cell protein production.
7. Fruit-processing waste may be used in single-cell protein production because it contains:
A.
Biodegradable organic substances
B.
Only metallic compounds
C.
Non-biodegradable plastic
D.
No usable nutrients
Correct Answer:
Biodegradable organic substances
Explanation:
Fruit-processing waste contains biodegradable organic compounds that can be utilized by microorganisms as a substrate for producing microbial biomass.
8. Which of the following is NOT an agricultural waste substrate for single-cell protein production?
A.
Sugarcane bagasse
B.
Rice bran
C.
Wheat straw
D.
Plastic bottle
Correct Answer:
Plastic bottle
Explanation:
Sugarcane bagasse, rice bran, and wheat straw are agricultural wastes, whereas a plastic bottle is not an agricultural waste substrate.
9. Before some agricultural wastes are used for microbial cultivation, they may require treatment mainly to:
A.
Make their nutrients more accessible
B.
Convert them into metal
C.
Remove all organic matter
D.
Make them completely non-biodegradable
Correct Answer:
Make their nutrients more accessible
Explanation:
Treatment can break down complex materials in agricultural wastes and make their nutrients more accessible to microorganisms used for single-cell protein production.
10. Using agricultural waste as a substrate for single-cell protein production helps to:
A.
Convert waste into useful microbial biomass
B.
Increase the amount of unused waste
C.
Prevent all microbial growth
D.
Produce only inorganic materials
Correct Answer:
Convert waste into useful microbial biomass
Explanation:
Microorganisms can grow on suitable agricultural wastes and convert their organic matter into microbial biomass, which is used as single-cell protein.
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