CLASS 10th SCIENCE NOTES CHAPTER 10 ENVIRONMENTAL PROBLEMS AND SOLUTION

CLASS 10th SCIENCE NOTES CHAPTER 10 ENVIRONMENTAL PROBLEMS AND SOLUTION

CLASS 10th SCIENCE NOTES CHAPTER 10 ENVIRONMENTAL PROBLEMS AND SOLUTION. Environmental problems are harmful effects of human activity in the biophysical environment. Environmental protection is a practice of protecting the natural environment at the individual, organizational or governmental level, for the benefit of both the environment and human beings. Environmentalism, a social and environmental movement, addresses environmental issues through advocacy, education, and activism.CLASS 10th SCIENCE NOTES CHAPTER 10 ENVIRONMENTAL PROBLEMS AND SOLUTION.

CLASS 10th SCIENCE NOTES CHAPTER 10 ENVIRONMENTAL PROBLEMS AND SOLUTION

CLASS 10th SCIENCE NOTES CHAPTER 10 ENVIRONMENTAL PROBLEMS AND SOLUTION
CLASS 10th SCIENCE NOTES CHAPTER 10 ENVIRONMENTAL PROBLEMS AND SOLUTION

CLASS 10th SCIENCE NOTES CHAPTER 10 ENVIRONMENTAL PROBLEMS AND SOLUTION

CLASS 10th SCIENCE NOTES CHAPTER 10 ENVIRONMENTAL PROBLEMS AND SOLUTION. The carbon dioxide equivalent of greenhouse gases in the atmosphere has already exceeded 400 parts per million (with a total “long-term”greater than 455 parts per million) (Report of the Intergovernmental Panel on Climate). The amount of greenhouse gas in the atmosphere is possibly above the threshold that can potentially cause climate change.

CLASS 10th SCIENCE NOTES CHAPTER 10 ENVIRONMENTAL PROBLEMS AND SOLUTION. The United Nations Office for the Coordination of Humanitarian Affairs has stated “Climate change is not just a threat in the distant future. It is the main driver of the increase in humanitarian needs and we are seeing its impact. The number of people affected and the damage inflicted by extreme weather has been unprecedented.CLASS 10th SCIENCE NOTES CHAPTER 10 ENVIRONMENTAL PROBLEMS AND SOLUTION.

CLASS 10th SCIENCE NOTES CHAPTER 10 ENVIRONMENTAL PROBLEMS AND SOLUTION
CLASS 10th SCIENCE NOTES CHAPTER 10 ENVIRONMENTAL PROBLEMS AND SOLUTION

UNIT-10

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Q2. Define the term desertification.

Ans. Desertification is the term used for the degradation of land due to climatic changes or human activities. Irregular rainfalls lead to dry condition and drought, which in turn result in low vegetation. Excessive use of land for agriculture, deforestation and over grazing is the other main causes of desertification.

Q4. What are natural disasters and in which form these are exhibited?

Ans. Natural disasters are happenings that bring worst changes deep down the earth or on its surface. They are exhibited in the forms of floods, droughts, volcanic eruptions, earthquakes, cyclones or hurricanes, avalanches and forest fires.

Q7. Write five major effects on environment by human activities.

Ans. Major Effects on environment by human activities are the following.

Human activities are badly affecting the ozone layer.

Human activities are resulting in the desertification of the fertile lands.

Human activities have increased the global warming.

Human activities have increased the amount of acid rains.

Human beings have cut down trees that cause deforestation.

Q8. What do you mean by solid and hazardous waste?

Ans: A hazardous waste is a waste having a harmful effect on human health or the environment. Hazardous waste is generated from many sources, ranging from industrial wastes to domestic wastes including liquids, solids, gases, and sludge (mud).

Q9. What is an earthquake?

Ans: An earthquake is a shaking of the ground caused by movement of the Earth’s crust. Earthquakes can range in size from those that are so weak that they cannot be felt to those violent enough to destroy whole cities. During a severe earthquake the earth splits apart. They bring fear, destruction and suffering.

Q10. What do you mean by a storm?

Ans: Storm is an extreme weather condition with very strong wind, heavy rain, and often thunder and lightning. It affects the environment and results in severe destruction. Lives and properties of the people are at risk in storm. Some of its negative effects are floods, fallen trees, fire accidents and electricity failure.

Q What are the main sources of chemical water pollution

The main sources of chemical water pollution are as discussed below:

a) Industries: produces large volumes of waste water and also discharge liquids containing chemicals in them. This waste becomes more toxic to aquatic life.

b) Naturally occurring toxic chemicals: These include chemicals such as fluorine that occurs naturally at high rates near mining areas.

c) Water disinfection: it is also a way of polluting water when chlorine is added in large amounts rather than the expected amount during water treatment.

d) Agricultural runoff: The runoff consists of soils which contains nutrients such as nitrogen and phosphorus

Q. How polluted water does affects our health?

Ans: Effects of water pollution are as follows:

i) Health effects:

Affects the nervous system. Cause irritation or inflammation of eyes, nose and skin. Affects reproductive systems of human beings and retard development of children. Causes chronic illness such as liver and kidney problems. Also affects the endocrine system of human.

Q13. How can we control or reduce water pollution?

Ans: We can control water pollution by reducing, reusing and recycling things as much as possible and by choosing carefully which products we buy and use. We have to minimize the use of toxic chemicals and plastics. We have to stop the discharge of domestic sewage and sewage sludge to save marine life. We can control water pollution by Enhancing public awareness, Oxygenation of the water body and Treatment of agricultural waste.

Q14. What are the harmful effects of mobiles?

Ans: The harmful radiations emitted by the cell phones can damage DNA. DNA damage in brain cells can affect neurological functions. They can disturb our stress level and cause sleep disorders. The greasy oily screen is the breeding place for germs. Focusing too much on the screen harms eyesight. Frequent and rapid text messages and e-mails can cause pain and inflammation in the joints of hands. Holding the phone between neck and shoulders while talking during work can cause back pain.

Q15. Describe the harmful effects of computer.

Ans. Excessive use of computer can cause headache and backache, pain in hand and finger joints, vision abnormalities and eye strains. It can delay physical as well as mental development. Its addiction can affect educational process. Computers can badly affect the interpersonal skills of a person.

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Q4. What do you mean by climate change? Describe some of its effects.

ANS. Climate change occurs when changes in Earth’s climate system result in new weather patterns that remain in place for an extended period. Global climate change has its effects on our environment. Glaciers have shrunk, ice on rivers and lakes is breaking up earlier, plant and animal ranges have shifted, trees are flowering sooner, loss of sea ice, sea level rise and longer, more intense heat waves.

The length of the frost-free season will increases

Precipitation patterns will change differently in different places.

Droughts and heat wave will become more intense and cold waves less intense everywhere. Summer temperatures will continue rising

Hurricanes Will Become Stronger and More Intense. Sea Level Will Rise. The Arctic Ocean is expected to become essentially ice free in summer

Q5. Describe natural disasters caused by El-Nino and La-Nina.

Ans: Impacts of El Niño:

El Niño and La Niña can make extreme weather events in certain regions, including droughts, floods and storms. Over 60 million people were impacted by the 2015/2016 El Niño. East Africa, Southern Africa, the Pacific Islands, South East Asia and Central America were most affected by extreme weather of rains and flooding. People suffered from food shortage due to low crop yields and rising prices; higher malnutrition rates and forced displacement. Excessive rainfall also triggered outbreaks of cholera, typhoid and malaria.

Impacts of La Niña:

In the tropics, La Niña (or cold episodes) produces roughly the opposite climate variations from El Niño. For instance, parts of Australia and Indonesia face drought during El Niño but are typically wetter than normal during La Niña.

La Niña is often associated with wet conditions in many places. La Niña usually leads to increased rainfall in some places and cause low rainfall in some parts of the world.

Q8. Describe the harmful effects of the excessive use of television on individual health.

Ans: Disadvantages of Watching Television:

Crime, violence and sex are frequently depicted on television and may have negative effects on minds. Violent display on TV will result in aggressive or violent behavior. It ends up in trouble, in jail, or in a hospital.

Watching television and obesity go side by side. Excessive TV watching contribute to sleep difficulties, behavior problems, lower grades, and other health issues.

Television makes us antisocial, taking the place of family and friends.

It’s a waste of time. Watching television fills the time a person might have spent doing important.

Television often misleads the watcher’s perception of the world.

Television’s hidden agenda is to trap consumers: Advertisers often target viewers to buy things they can go without them.

It’s shallow, and it makes others shallow, too.

Most reality shows depict characters doing silly, useless things.

Television can ruin relationships. Watching television instead of spending time with people makes the television a problem.

Television might be addictive. Those who watch a lot are hard to quit. It is similar to any another addiction.

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