Environmental Science - Study Mode
[#286] Acid deposition causes
Correct Answer
(B) lakes and forests to die
Explanation
Solution: Rainfall that is acidic, possesses elevated H+ ion concentrations, and has been commonly known as ‘acid rain’. the contribution from SO2 is considerably smaller than during the 1970s, so that currently, oxidised and reduced nitrogen dominate acid deposition. Deposition of reduced nitrogen (N) compounds, e.g.NH4+, can acidify via microbial transformations in the soil and also assimilation in plants leading to acidification of the rhizospehere. Other compounds also contribute to acid deposition, e.g. hydrochloric acid (HCl)
[#287] Melanornia (skin cancer) is associated with
Correct Answer
(B) ozone depletion
Explanation
Solution: Skin cancer is an abnormal growth of skin cells. It most often develops on areas of the skin exposed to the sun’s rays. Skin cancer affects people of all colors and races, although those with light skin who sunburn easily have a higher risk.
[#288] When oil and gas resources are burnt they kill many forests and lakes by
Correct Answer
(C) acid rain
Explanation
Solution: The process that we call "burning" actually is chemical reactions with oxygen in the air. For the most part, the carbon combines with oxygen to form carbon dioxide (CO2), and the hydrogen combines with oxygen to form water vapor (H20). In both of these chemical reactions a substantial amount of energy is released as heat. Since heat is what is needed to instigate these chemical reactions, we have a chain reaction: reactions cause heat, which causes reactions, which cause heat, and so on. Once started the process continues until nearly all of the fuel has gone through the process (i.e., burned), or until something is done to stop it. Of course, the reason for arranging all this is to derive the heat.
[#289] Soil pollution is caused by
Correct Answer
(C) Acid rain
Explanation
Solution: soil pollution as part of land degradation is caused by the presence of xenobiotics (human-made) chemicals or other alteration in the natural soil environment.
[#290] What is hibernation and aestivation?
Correct Answer
(A) Thermal adaptation shown by animals
Explanation
Solution: Aestivation is summer sleep and during aestivation, animals usually tend to rest in a shady and cool place. They take sleep during the hot hours of daytime. Hibernation is a winter sleep and in this sleep, an organism tend to pass the time in dormant conditions. They are not active at all. The find a warm place for themselves to protect their body from the surrounding cold environment.