Environmental Science - Study Mode

[#606] Which gas is likely to be reduced in the atmosphere by deforestation?
Correct Answer

(C) Oxygen

Explanation

Solution: Oxygen is the gas which is likely to be reduced in the atmosphere by deforestation. One of the most dangerous threats to life on earth is the increase in pollution which is caused because of the increase in the concentration of carbon dioxide and carbon monoxide in the environment.

[#607] In a volume of air near the earth's surface, ____ occupies 78 percent and ____ nearly 21 percent.
Correct Answer

(A) Nitrogen, oxygen

Explanation

Solution: In a volume of air near the earth's surface, nitrogen occupies 78 percent and oxygen nearly 21 percent.

[#608] Plants which grow in shade are called
Correct Answer

(A) Sciophytes

Explanation

Solution: Plants growing in bright light are called as sun plants or heliophytes, while plants growing in partial shade or low light intensity are called as shade plants or sciophytes.

[#609] Plants which grow in light are called
Correct Answer

(B) Heliophytes

Explanation

Solution: Plants which grow in light are called Heliophytes.

[#610] What is the man-made greenhouse gas known as?
Correct Answer

(B) HFC

Explanation

Solution: Many greenhouse gases occur naturally in the atmosphere, such as carbon dioxide, methane, water vapor, and nitrous oxide, while others are synthetic. Those that are man-made include the chlorofluorocarbons (CFCs), hydrofluorocarbons (HFCs) and Perfluorocarbons (PFCs), as well as sulfur hexafluoride (SF6).