Environmental Science In Agricultural - Study Mode
[#111] Spraying DDT produces pollution of
Correct Answer
(D) Air, water and soil
Explanation
Solution: Spraying DDT produces pollution of Air, water and soil. Dichlorodiphenyltrichloroethane, commonly known as DDT, is a colorless, tasteless, and almost odorless crystalline chemical compound, an organochloride. DDT is a persistent organic pollutant that is readily adsorbed to soils and sediments, which can act both as sinks and as long-term sources of exposure affecting organisms. DDT is highly hydrophobic and nearly insoluble in water thus causing water pollution also.
[#112] Wild life is destroyed most when
Correct Answer
(C) Its natural habitat is destroyed
Explanation
Solution: Wild life is destroyed most when its natural habitat is destroyed. Wildlife refers to undomesticated animal species, but has come to include all organisms that grow or live wild in an area without being introduced by humans. The habitat of any given species is considered its preferred area or territory. Many processes associated with human habitation of an area cause loss of this area and decrease the carrying capacity of the land for that species.
[#113] Ozone Layer occurs in
Correct Answer
(D) Stratosphere
Explanation
Solution: Ozone Layer occurs in Stratosphere. The stratosphere is the second layer of the atmosphere of the Earth, located above the troposphere and below the mesosphere. The increase in temperature with altitude is a result of the absorption of the Sun's ultraviolet (UV) radiation by the ozone layer. The oxygen atom product combines with atmospheric molecular oxygen to reform O 3 , releasing heat. The rapid photolysis and reformation of ozone heat the stratosphere, resulting in a temperature inversion.
[#114] A biogeochemical cycle without an atmospheric component is
Correct Answer
(C) Phosphorus
Explanation
Solution: A biogeochemical cycle without an atmospheric component is Phosphorus. A biogeochemical cycle is the pathway by which a chemical substance cycles the biotic and the abiotic compartments of Earth. The six most common elements associated with organic molecules like carbon, nitrogen, hydrogen, oxygen, phosphorus and sulphur take a variety of chemical forms and may exist for long periods in the atmosphere, on land, in water, or beneath the Earth's surface. Phosphorus is used to make nucleic acids and the phospholipids that comprise biological membranes.
[#115] Organisms of an ecosystem are linked together in
Correct Answer
(A) Food chains
Explanation
Solution: Organisms of an ecosystem are linked together in Food chains. A food chain is a linear network of links in a food web starting from producer organisms (such as grass or algae which produce their food via photosynthesis) and ending at an apex predator species (like grizzly bears or killer whales), detritivores (like earthworms or woodlice), or decomposer species (such as fungi or bacteria). A food chain also shows how organisms are related to each other by the food they eat. Natural interconnections between food chains make it a food web.