The Importance of Green Plants in the Environment

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  • Created by: Ella
  • Created on: 25-05-13 16:30

Respiration in plants

Green plants photosynthesise at the same time that they respire ( NOT BREATHING!)

Respiration is a cellular process and a usable form of energy from sugars. The process produces carbon dioxide, which can be used in photosynthesis.

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How environment can influence/be influenced by pla

  • Global Warming
  • Acid rain
  • Deforestation 
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Acid experiment

THEORY

  • The more acidic the environment the lower the rate of cross seed germination

VARIABLES 

  • Independant variables - Percentage of acid (pH)
  • Dependant variables - Cross seed germination (%)
  • Controll variables - Number of seeds (x10), cotton wool

METHOD

  • Equal amounts of cotton wool in four petri dishes
  • 10 cress seeds in each petri dish
  • 10cm3 of water in one petri dish, lable it 0%
  • 10cm3 of 100% acid in another petri dish, lable it 100%
  • 10cm3 of 100% acid in a beaker, add 10cm3 of water in same beaker, 10cm3 of this solution into petri dish, lable it 50%
  • Add 10cm3 of water to the remaining solution, put in petri dish, lable it 25%
  • Put each dish under controlled temperature
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Effects of acid rain

  • Acid rain has a pH value between pH 5.5 and pH 2 
  • The acidity of the rain dpends on the amount of acidic gases dissolved in it
  • When acid rain reaches streams and lakes, it makes them acidic; this could kill the water life, including any fish
  • When acid rain falls on the ground, it soaks into the soil and reacts with the minerals in the soil. This may prevent plants from taking up minerals such as iron, zinc and magnesium which they need for healthy growth
  • When acid rain falls directly ont oplants, it may damage new shoots and leaves. This also prevents plant growth
  • When acid rain falls on buildings and other sturctures is also causes damage; the acid rain reacts with any carbonates contained in the rocks used for building. 
  • Acid rain also corrodes metals such as iron, weakening bridges and other large structures
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The greenhouse effect

SUMMARY

  • Carbon dioxide and water vapour reduce the amount of heat radiated from the earth's surface into space and keep the earth warm. Their action is called the greenhouse effect. The percentage of carbon dioxide in the atmosphere is increasing, and the temperature of the earth is rising. If it continues to rise, the polar ice caps could melt.

GREENHOUSE EFFECT BROKEN DOWN

  • Radiation from Sun warms the Earth
  • The Earth radiates heat back into space
  • Water and carbon dioxide radiate part of the absorbed energy into space
  • Water and carbon dioxide absorb radiation 
  • Water and carbon dioxide radiate part of the absorbed energy back towards the Earth
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Deforestation

  • Deforestation is the removal of a forest or stand of trees where the land is thereafter converted to a non-forest use.

REASONS FOR DEFORESTATION

  • Growing demand for farming/land
  • Road construction in the forest 
  • In some, deforestation occurs so that miners can search for minerals below the forest floor

EFFECTS 

  • The forest is home to 2/3 of the planets animals, by removing the trees, we are killing off 66.6% of animals 
  • Every human depends on trees and other such vegetation for survival (oxygen)
  • The rainforest is a massive supplier of water


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