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Answer 1

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17 ) excessive richness of nutrients in a lake or other body of water, frequently due to run-off from the land, which causes a dense growth of plant life.

2 consequences of eutrophication

#The main environmental effects of eutrophication are increase of suspended particles owing to extensive macroalgal blooms, decrease of water clarity, and increase in the rate of precipitation that led to the destruction of benthic habitat by shading of submerged vegetation.

#The known consequences of cultural eutrophication include blooms of blue-green algae (i.e., cyanobacteria, Figure 2), tainted drinking water supplies, degradation of recreational opportunities, and hypoxi

18) Communicable diseases, also known as infectious diseases or transmissible diseases, are illnesses that result from the infection, presence and growth of pathogenic (capable of causing disease) biologic agents in an individual human or other animal host.

Example: malaria, measles

19)The loss of trees and other vegetation can cause climate change, desertification, soil erosion, fewer crops, flooding, increased greenhouse gases in the atmosphere, and a host of problems for indigenous people.

20)Five Basic Cholera Prevention Steps

#Make sure to drink and use safe water to brush your teeth, wash and prepare food, and make ice. ...

#wash your hands often with soap and safe water* ...

#Use latrines or bury your poop; do not poop in any body of water. ...

#Cook food well (especially seafood), keep it covered, and eat it hot.

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Answer 2

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~ Define eutrophication and mention any two consequences of eutrophication ?

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~ Eutrophication is the process in which a water body becomes overly enriched with nutrients, leading to plentiful growth of simple plant life. The excessive growth of algae and plankton in a water body are indicators of this process.

~ Consequences :

• Depletion of oxygen level

• Water loses its transparency and develops a bad smell and colour. The treatment of this water becomes difficult.

• Population of fishes are reduced.

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~ What is mean by Communicable disease ? Give it's example ?

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Diseases which are transferred from one person to another caused by pathogens are called Communicable disease. Examples include typhoid, tuberculosis , cholera, etc.

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~ Write any four effects of Deforestation ?

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~ Effects of Deforestation include :

• Soil erosion

• Loss of Biodiversity

• Flooding

• Green house gas emissions

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~ How can we control and prevent Cholera ?

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~ Steps to control and prevent Cholera :

• Drink water which is boiled.

• Avoid consumption of raw foods.

• Avoid dairy products as much as possible.

• Wash fruits and vegetables before you eat.

• Washing your hands before you eat is a good way to keep the disease away.

• Drink plenty of water and it is recommended • to drink about 8 ounces of water every day.

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