Science Practice Quiz 217

Q1.How do green plants primarily contribute to maintaining the oxygen content in the air?

A. By absorbing excess carbon dioxide from the atmosphere. B. By releasing oxygen during the process of photosynthesis. C. By converting nitrogen into oxygen in their roots. D. By preventing the depletion of oxygen through respiration.

Q2.What human activity is specifically mentioned as disturbing the constant oxygen content in the air?

A. Burning of fossil fuels B. Industrial pollution C. Cutting down trees D. Increased animal respiration

Q3.For what purpose do green plants primarily use carbon dioxide?

A. To release nitrogen into the atmosphere. B. To make their food. C. To facilitate the breathing process. D. To absorb excess water from the soil.

Q4.What is identified as the primary reason for upsetting the balance of carbon dioxide in the atmosphere?

A. Increased plant respiration. B. Decomposition of organic matter. C. Burning of fuels like coal and oil. D. Volcanic eruptions.

Q5.What is the stated consequence of the increased volume of carbon dioxide in the atmosphere?

A. It leads to a decrease in global temperatures. B. It enhances the growth of green plants worldwide. C. It affects the Earth’s weather and climate. D. It causes an increase in atmospheric oxygen levels.

Q6.How does air circulation primarily take place, according to the provided text?

A. Hot air sinks, and cold air rises to fill the gap. B. Cold air expands and becomes lighter, causing it to rise. C. Hot air rises, and cold air from surrounding areas rushes to fill the gap. D. Air circulation is caused by the rotation of the Earth.

Q7.What fraction of the sun's total energy does the Earth receive, according to the provided text?

A. 1 in 200,000 parts B. 1 in 2,000,000 parts C. 1 in 2,000,000,000 parts D. 1 in 20,000,000,000 parts

Q8.Which of the following light gases are mentioned as floating into space from the exosphere?

A. Oxygen and Nitrogen B. Carbon Dioxide and Argon C. Helium and Hydrogen D. Methane and Ozone

Q9.What is defined as 'the degree of hotness and coldness of the air'?

A. Climate B. Weather C. Temperature D. Insolation

Q10.What is 'insolation' defined as in the text?

A. The outgoing terrestrial radiation. B. The reflection of solar energy by clouds. C. The incoming solar energy intercepted by the earth. D. The heat trapped by greenhouse gases.

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Science Practice Quiz 217