HOTS Questions: Natural Resources

Among the pollutants motor vehicles produce are various sulfur oxides, nitrogen oxides, unburned hydrocarbons, carbon dioxide, carbon monoxide and particulates.

Greenhouse effect can be defined as the trapping of the radiations of the sun by the atmospheric gases and the subsequents reflection on the earth’s surface causing global warming. There are many greenhouse gases like water vapour, methane, CFCs, etc. but carbon dioxide is the major concern because it has contributed to most of the Global Warming 1750 to 2011 as per IPCC data and it tends to accumulate in the atmosphere. It is released in greater amounts from the vehicular emissions, deforestation, industrial emissions etc. so it constitutes around 81% of the greenhouse gases.
Hence, the correct answer is “CO2”.
 

Insecticide is a type of pesticide. 
Pesticides can contaminate soil, water, turf, and other vegetation. In addition to killing insects or weeds, pesticides can be toxic to a host of other organisms including birds, fish, beneficial insects, and non-target plants.

Viral diseases are severe infectious diseases which spread rapidly from one person to the other. Pancreatic necrosis (IPN) is a viral disease which occurs in salmon fish. It is mainly caused due to the premature killing of the cells in the living tissues.

Viral haemorrhagic septicemia (VHS) is a deadly infectious fish disease caused by the viral hemorrhagic septicemia virus. It afflicts over 50 species of freshwater and marine fish in several parts of the northern hemisphere.

Therefore, the correct answer is option A.