It's just me...

It's just me...

Wednesday, May 27, 2015

EASY ANSWERING BIOLOGY : ENDANGERED ECOSYSTEM

A group of farmers planned to develop an agriculture nearby the lake. Explain the effect on the lake if their planning is not managed properly.

  • Farmers use fertilisers that usually contain nitrates and phosphates.
  • The leaching of chemical fertiliser from agriculture area to the lake may occur when it rains.
  • Increase the fertility of lake.
  • Encourages eutrophication (algal growth)
  • The growth of algae prevents the light from reaching the base of the lake.
  • This reduce and prevents photosynthesis by aquatic plants.
  • Reduce the oxygen release.
  • Aquatic animals and plants die due to lack of oxygen.
  • Decomposition of dead plants, animals and organic matter by bacteria rapidly.
  • This will increase the dissolved oxygen content.
  • BOD increases the water polluted.
  • This cause the aquatic animals die.

Explain briefly about the acid rain phenomenon and its effect to the environment.



EXPLANATION
  • Occurs when motor vehicles / factory released large amount of nitrogen oxide
  • and sulphur dioxide
  • Nitrogen oxide combine with water vapour in atmosphere to form nitric acid.
  • Sulphur dioxide combine with water vapour in atmosphere to form sulphuric acid.
  • The rain fall as the acid rain.
EFFECT
  • May corrode the building
  • Acidic water causes aquatic animals die
  • Minerals in soil dissolved in water
  • Soil becomes infertile / not suitable for plant to growth
  • Less yield / plant die because of infertile soil
  • The ecological balance of ecosystem distrupt

Explain how ozone depletion occurs. Discuss its effects on human and the environment and suggest the ways to solve this problem.



EXPLANATION 
  • Thinning of ozone layer is due to widespread use of CFC
  • It is used in aerosol, industrial solvents, electronics and in air conditioner
  • Ultraviolet radiation strikes CFC molecule cause chlorine atom to break away
  • Then chlorine atom collides with an ozone molecule and combines with an oxygen atom to form chlorine monoxide and oxygen.
  • Then the free atom of oxygen collides with the chlorine monoxide, the two oxygen atoms form a molecule of oxygen.
  • The chlorine atom is released and free to destroy more ozone molecules.
  • The chlorine produced re-enters the cycle.
  • When the ozone layer becomes thinner, more ultraviolet radiation reaches the Earth.
EFFECTS 
  • Reduction of body's immune system
  • Skin cancer
  • Eye cataract
  • Reduction of rate of plant growth / reducing crop yields
  • Death of plankton / Reduce food supply to aquatic organisms
WAYS TO OVERCOME
  • Reduce / Stop using CFC or chlorine-based products
  • Replace CFC with HCFC
  • Use wrapping paper instead of polysterene boxes

Discuss how forest burning causes disasters to the environment.

  • Releases a lot of carbon dioxide into atmosphere.
  • Carbon dioxide traps heat and causes global warming.
  • Releases heavy smoke which reduces light intensity for photoynthesis.
  • Smoke particles cause health hazards
  • Destroys flora and fauna
  • Lost of herbs for medical puposes
  • Lost of habitat and extinction of flora and fauna

Explain the effect of an increase in carbon dioxide concentration on the ecosystem.

  • Increase in carbon dioxide is due to the burning of fossil fuels in vehicles and excessive cutting down of trees in the forests.
  • Increase in the carbon dioxide traps heat.
  • Mirrored buildings reflect heat
  • which causes a rise in temperature of Earth.
  • This phenomenon is called greenhouse effect.
  • Industries increase the amount of CFCs and methane in atmosphere and cause global warming.
  • It will cause the melting of ice at the poles.
  • The sea level rises
  • which causes low-lying areas to be flooded.
  • It will affect the weather pattern, wind directions and rainfall
  • which will affect the yield of crops and water supply.
  • The land becomes dry and infertile due to drought.

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Design Experiment SPM Biology