Nat5 Biology Unit Three Life On Earth Key Area 3 Photosynthesis
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What are the two stages of photosynthesis?
Light Reactions Carbon Fixation
What happens During the Light Reactions?
The light energy from the sun is trapped by chlorophyll in the chloroplasts and is converted into chemical energy which is used to generate ATP. ○ Water is split to produce hydrogen and oxygen. ○ Oxygen diffuses from the cell.
What happens during Carbon Fixation?
A series of enzyme-controlled reactions, which use hydrogen and ATP (produced by the light reactions) with carbon dioxide to produce sugar.
What is the word process of Photosynthesis?
Light CO2 + Water ——> Sugar + O2 Chlorophyll
The ______ in sugar is available for ____ or the sugar can be converted into other substances, such as _____ and ____
The CHEMICAL ENERGY in sugar is available for RESPIRATION or the sugar can be converted into other substances, such as STARCH (STORAGE) and CELLULOSE (STRUCTURAL)
What are Limiting Factors?
A factor that is in short supply. If the quantity is increased, then the rate of Photosynthesis will increase
What are the Limiting Factors of Photosynthesis?
Carbon Dioxide Concentration - One of the raw materials - if there a lot of it, the rate of Photosynthesis will be high Light Intensity - the higher it is the faster the rate of Photosynthesis Temperature - the enzymes will denature once they get past their optimum temperature
What are the limiting factors at X and Y? Y / \_\_\_\_\_\_\_\_\_\_\_\_\_\_ 30° /\_\_\_\_\_\_\_\_\_\_\_\_\_\_ 20° / ^ / | / ROP / -X | / ^ \_\_\_\_\_\_\_/ Light Intensity
X - Light Intensity Y - Temperature Y / \_\_\_\_\_\_\_\_\_\_\_\_\_\_ 30° /\_\_\_\_\_\_\_\_\_\_\_\_\_\_ 20° / ^ / | / ROP / -X | / ^ \_\_\_\_\_\_\_/ Light Intensity