Topics 3.8

3.8.1 - 3.8.3, 3.8.5, 3.8.6: Photosynthesis

Equation Photosynthesis

Photosynthesis involves the conversion of light energy to chemical energy and consists of a light-dependent reaction (requires light energy) and a light-independent reaction (does not require light energy). As shown in Figure 1 below, carbon dioxide and water are used to produce glucose and oxygen. The main photosynthetic pigment in chlorophyll. Light energy captured by chlorophyll is used to produce ATP, and to split water molecules (photolysis) to form oxygen and hydrogen. ATP and hydrogen (derived from the photolysis of water) are used to fix carbon dioxide to make organic molecules.

Figure 1: Overview of Photosynthesis


3.8.4: The differences in absorption of red, blue and green light by chlorophyll

Place mouse pointer on the figure to show the explanation of absorption of red, blue and green light.


3.8.7: Measuring the rate of photosynthesis

Measuring Rate of Photosynthesis

3.8.8: The effects of carbon dioxide, light intensity and temperature on the rate of photosynthesis

Figure 2: Effects of carbon dioxide on photosynthetic rate

carbon dioxide graph

Figure 3: Effects of light intensity on photosynthetic rate

light intensity graph

Figure 4: Effects of temperature on photosynthetic rate

temperature graph

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