Plant processes photosynthesis

1,222 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,222
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
19
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Plant processes photosynthesis

  1. 1. Plant Processes: Gas Exchange and Photosynthesis<br />8SCIENCE Mon. Feb. 14, 2011<br />
  2. 2. What is gas exchange in plants?<br />When we inhale, we breathe in a mixture of gases we need for survival<br />When we exhale, we breathe out the waste products<br />In plants, CO₂ and H₂O are two substances needed for survival<br />CO₂ enters through the stomata <br />H₂O is absorbed through roots of the plant and released as water vapor through the stomata<br />
  3. 3. Gas Exchange<br />Light, H₂O and CO₂ all affect the opening and closing of stomata<br />Stomata are usually open during the day and close at night <br />When stomata closes, less CO₂ can enter and less H₂O can escape<br />When plants lose water vapor through stomata, this is called transpiration<br />
  4. 4. Photosynthesis<br />Photosynthesis is the process in which plants use light energy to make food<br />Chlorophyll is a chemical in plants that helps to capture this light energy<br />Other than light, plants also need H₂O and CO₂<br />These molecules combine to form an organic compound, a carbohydrate (sugar) called glucose<br />
  5. 5. Process of Photosynthesis<br /> 6CO₂ + 6H₂O + light energy  C₆H₁₂O₆ + 6O₂<br /> Carbon dioxide + water + light (and chlorophyll) produces glucose and oxygen<br />A plant needs 6 molecules of carbon dioxide (CO₂) and 6 molecules of water (H₂O) to make one molecule of glucose (C₆H₁₂O₆)<br />The chemical bonds in glucose contain the energy the plant needs for growth and survival and is the main source of food for plants<br />Oxygen is also produced during photosynthesis and released through plant stomata<br />

×