1) Name two bacterial disease with the name of causative organism ?
2) Name two viral disease with RNA and DNA as genetic material ?
3) What is Acute & Chronic disease ?
4) Explain Nitrogen cycle with diagram ?
5) Explain Carbon cycle with diagram ?
6) Explain Oxygen cycle ?
7) What do you mean by ozone depletion ?
8) What are Green house gases & what is green house effect ?
9) What are pollutants & Name some air pollutants, water pollutants ?
Answers
Answer:
1) Typhoid : Salmonella typhi
TB : Mycobacterium tuberculosis
2) Measles and AIDs
3) Acute conditions are severe and sudden in onset. This could describe anything from a broken bone to an asthma attack.
A chronic condition, by contrast is a long-developing syndrome, such as osteoporosis or asthma.
4) Nitrogen Cycle is a biogeochemical process through which nitrogen is converted into many forms, consecutively passing from the atmosphere to the soil to organism and back into the atmosphere. It involves several processes such as:
Nitrogen fixation : The process of conversion of nitrogen (N2) to ammonia .
Ammonification : Decomposition of organic nitrogen of plants and animals into ammonia.
Nitrification : Ammonia is first oxidised to nitrite and then to nirate (No3-) by the help of chemoautotrophs.
Denitrification : Nitrate present in the soil is reduced to nitrogen.
5) Carbon Cycle is a biogeochemical cycle where various carbon compounds are interchanged among the various layers of the earth, namely, the biosphere, geosphere, pedosphere, hydrosphere and atmosphere.
•Carbon enters the atmosphere as CO2
•CO2 is absorbed by autotrophs such as green plants
•Animals consume plants, thereby, incorporating carbon into their system
•Animals and plants die, their bodies decompose and carbon is reabsorbed back into the atmosphere.
6. The oxygen cycle is the biogeochemical cycle of oxygen. It is mainly involved in maintaining the level of oxygen in the atmosphere. Oxygen is the main by-product of photosynthesis. It is involved in the oxidation of carbohydrates with the release of energy, carbon dioxide and water.
7. Ozone layer depletion is the thinning of the ozone layer present in the upper atmosphere. This happens when the chlorine and bromine atoms in the atmosphere come in contact with ozone and destroy the ozone molecules.
8. Water Vapour
Carbon Dioxide (CO2)
Methane (CH4)
Nitrous oxide (N2O)
Greenhouse effect is the process by which radiations from the sun are absorbed by the greenhouse gases and not reflected back into space. This insulates the surface of the earth and prevents it from freezing.
9. A pollutant is a substance that when introduced in the atmosphere causes undesirable changes in the atmosphere.
Air Pollutants : sulphur dioxide, carbon monoxide
Water Pollutants: Industrial Waste, Fertilizers, Pesticides, Sewage.
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