Science Practice Quiz 236

Q1.What is produced by yeast during respiration?

A. Oxygen B. Carbon dioxide C. Nitrogen D. Helium

Q2.What is the basis of the use of yeast in the baking industry?

A. Production of alcohol B. Production of carbon dioxide C. Production of oxygen D. Production of nitrogen

Q3.Who was working on a culture of disease-causing bacteria in 1929?

A. Louis Pasteur B. Alexander Fleming C. Streptomycin D. Tetracycline

Q4.What is the effect of the presence of mould on the growth of bacteria?

A. It promotes the growth of bacteria B. It has no effect on the growth of bacteria C. It prevents the growth of bacteria D. It kills all the bacteria

Q5.What is the commercial use of microorganisms for the large scale production of?

A. Alcohol, wine, and acetic acid B. Oxygen, nitrogen, and helium C. Carbon dioxide, oxygen, and nitrogen D. Penicillin, streptomycin, and tetracycline

Q6.What did Boojho and Paheli collect from nearby houses and gardens to make manure?

A. Wastes of plants, vegetables and fruits B. Polythene bags, empty glass bottles and broken plastic toys C. Dead animals and decaying plants D. Soil and microorganisms

Q7.What happened to the plant waste in pot A after 3-4 weeks?

A. It remained unchanged B. It was converted into polythene bags C. It was decomposed and converted into manure D. It was broken into glass bottles

Q8.What is the role of microorganisms in decomposing dead organic matter?

A. They convert dead organic matter into harmful substances B. They convert dead organic matter into simple substances that can be used by other plants and animals C. They have no role in decomposing dead organic matter D. They convert dead organic matter into polythene bags

Q9.What is the effect of microorganisms on polythene bags, empty glass bottles, and broken plastic toys?

A. They decompose them into manure B. They convert them into simple substances C. They have no effect on them D. They break them into smaller pieces

Q10.What is the outcome of the decomposition of dead organic matter by microorganisms?

A. The release of harmful substances B. The conversion of dead organic matter into simple substances that can be used by other plants and animals C. The formation of polythene bags D. The creation of empty glass bottles

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Science Practice Quiz 236