Environmental Science In Agricultural - Study Mode
[#181] Air pollution is maximum in
Correct Answer
(D) Automobile exhausts and chemical from industries
Explanation
Solution: Air pollution is maximum in automobile exhausts and chemicals from industries. Air pollution is the contamination of air due to the presence of substances in the atmosphere that are harmful to the health of humans and other living beings, or cause damage to the climate or materials. Aerosols are produced by human activities such as the combustion of fossil fuels in automobiles, power plants, and numerous industrial processes. Potential contributors to such an outcome include increased burning activities, traffic, agri-food and chemical industries.
[#182] Phosphorus cycle is in the form of
Correct Answer
(C) PO 4 -3
Explanation
Solution: Phosphorus cycle is in the form of PO 4 -3 . The phosphorus cycle is the biogeochemical cycle that describes the movement of phosphorus through the lithosphere, hydrosphere and biosphere. Phosphorus occurs most abundantly in nature as part of the orthophosphate ion (PO 4 ) -3 , consisting of a P atom and 4 oxygen atoms. Orthophosphate (PO 4 -3 ), the dominant inorganic P species in nature, is oxidation state (P 5+ ), certain microorganisms can use phosphonate and phosphite (P 3+ oxidation state) as a P source by oxidizing it to orthophosphate.
[#183] Which one of the following is a direct ecological factor?
Correct Answer
(B) Temperature
Explanation
Solution: Temperature is a direct ecological factor. Ecological factors include factors such as light, radiation, temperature, water, chemicals, gases, wind and soil. The direct effect is the effect of exposure on the outcome absent the mediator. Temperature is a physical quantity that expresses quantitatively the perceptions of hotness and coldness.
[#184] The most severe pollutant of metals and materials is
Correct Answer
(C) H 2 SO 4
Explanation
Solution: The most severe pollutant of metals and materials is H 2 SO 4 . Sulfuric acid will exist as particles or droplets in the air if released into the atmosphere. It dissolves when mixed with water. It has moderate acute (short-term) toxicity on aquatic life. Sulfuric acid is very corrosive and would badly burn any plants, birds or land animals exposed to it.
[#185] Environmental Science may be defined as
Correct Answer
(C) Both A and B
Explanation
Solution: Environmental Science may be defined as the application of all fields of natural science toward solving environmental problems. Also it is the sum of all social, economical, biological and physical or chemical factors which constitute all surroundings of men or living organisms, who is both creator and modular of this environment. Environmental science emerged from the fields of natural history and medicine during the Enlightenment. Today it provides an integrated, quantitative, and interdisciplinary approach to the study of environmental systems.