1. What is the importance of different biogeochemical cycles in the nature? (AS1)
2. What emissions from human activities lead to ozone depletion? And what are the
principal steps in stratospheric ozone depletion caused by human activities? (AS1)
3. Why could we say that biogeochemical cycles are in “balance”? (AS1)
4. If all the vegetation in the pond died, what effects would it have on the animals?
Why? (AS 2)
5. Write an experiment to prove Green house effect on temperature. (AS 3)
6. Go to a nearby pond observe organisms living in the pond and bio degradable substances
mixing in water. How they effect those organisms? Write your observation.(AS4)
7. Describe interdependence of biotic and abiotic components by taking Nitrogen cycle
as an example. Draw Nitrogen Cycle. (AS 5)
8. Write an essay explaining the importance of Ozone layer. (AS 6)
9. "Burning of fossil fuels a concern for scientists and environmentalists" How do you
support this statement? (AS 6)
10. "Co2
play a vital role in plant life process" - comment? (AS 7)
11. How human activities cause an imbalance in biogeochemical cycles? (AS 7)
12. List three ways we, as humans, have affected the water cycle.(AS 7)
13. Prepare an article for newspaper on the item "How human activities effects the
environment". (AS 7)
14. Prepare slogans on green house effect and read them out in the school assembly.(AS6)
Answers
Answer:
1. These cycles help in an efficient recycling of useful minerals like- nitrogen, phosphorus, carbon through various biotic and abiotic pathways and also helps in the steady flow of minerals to every part of an ecosystem.
2. Human activities cause the emission of halogen source gases that contain chlorine and bromine atoms. These emissions into the atmosphere ultimately lead to stratospheric ozone depletion. The source gases that con- tain only carbon, chlorine, and fluorine are called “chlo- rofluorocarbons,” usually abbreviated as CFCs.
The stratospheric ozone depletion process begins with the emission of halogen source gases by human activities and natural processes. Those emitted by human activities are also called ozone-depleting substances (ODSs). Subsequent steps are accumulation, transport, conversion, chemical reaction, and removal.
3. Biogeochemical cycles include biological,geological, and physiochemical pathways. 2. these occur a continuous dynamism in the cycle,in order to transfer matter and this change is almost kept constant. ... 5.so,we can say biogeochemical cycles are in balance naturally.
4. If all the vegetation in the pond died then the fishes, and other underwater animals and organisms would also die without oxygen. Because the underwater plants provide the O2 for the other organisms to live.
5. What You Do: Lay the thermometers in direct sunlight. Let them sit in the sun for three minutes. Open up a page of the notebook and draw two columns, one labeled "Thermometer A" and one labeled "Thermometer B."After the three minutes have passed, read and record the time and thermometer temperatures in the notebook.
6. Go to nearby pond observe organisms living in the pond and bio degradable substance mixing in water. ... Pond water refers to a standing body of water. This is usually smaller than a lake and may either be man-made or natural. Pond water contains a variety of plant and animal life.
7. The biotic (living) and abiotic (nonliving) components in the nitrogen cycle are dependent upon each other as nitrogen is the main component of the air we breathe. ... Here, the role of animals and decomposers is observed in the formation of atmospheric nitrogen.
8. Ozone protects the Earth from harmful ultraviolet (UV) rays from the Sun. Without the Ozone layer in the atmosphere, life on Earth would be very difficult. Plants cannot live and grow in heavy ultraviolet radiation, nor can the planktons that serve as food for most of the ocean life.
9. In the process of burning of fossil fuels, a large amount of carbon dioxide and heat are produced which affects the earth's atmosphere, these effects are the source of concern for scientists and environmentalists.
10. The part carbon dioxide plays in environmental processes
The part carbon dioxide plays in environmental processesCarbon dioxide plays an important part in vital plant and animal process, such as photosynthesis and respiration. ... Green plants convert carbon dioxide and water into food compounds, such as glucose, and oxygen. This process is called photosynthesis.
11. Human activities cause an imbalance in biogeochemical cycles. Human activities such as polluting the water bodies or deforestation have increased the CO2 level in the atmosphere and also nitrogen level in the biosphere. This leads to a problem such as cultural eutrophication.
12. Hydroelectricity, irrigation, deforestation, the greenhouse effect and vehicle and agricultural factors, all of which have consequences that interrupt the water cycle.
13. You can talk about:
Deforestation
Air pollution
Water pollution
Ozone layer depleation
Global warming
Extiction from hunting
Anything that has changed the environment.
They can also be positive. Write the article in terms of the future of the world if we keep doing these activities.
14. Some slogans on greenhouse effect are :
Be green. Be free from global warming.Global warming, a manmade warning.Stop global warming. Opt for global greening.Go green, not greenhouse.