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Topic 3.8 photosynthesis assessment statements
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Topic 3.8 photosynthesis assessment statements


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Topic 3.8 photosynthesis assessment statements

Topic 3.8 photosynthesis assessment statements

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  • 1. I-Shou International School IB Biology 3.8 Photosynthesis Assessment Statements (Core) 3.8.1 State that photosynthesis involves the conversion of light energy into chemical energy. The earth receives energy from the sun in the form of light and heat. State the name of the process that captures the light energy in the sun and converts it into a form that can be used by living things. State the form of energy that is stored by plants and which drives all the processes of life. State the following: Location in cell Prokaryotes/Eukaryotes Chemical reaction 3.8.2 State that light from the Sun is composed of a range of wavelengths (colors). List the approximate wavelengths of light for the following colors. Red Orange Yellow Green Blue 620–750 nm Indigo Violet Draw and label an arrow under the table above and indicate the shortest to longest wavelengths of visible light and the lowest to highest energy. White light contains the whole visible spectrum. Pure red light contains light of about 650nm. A red object appears red because it absorbs all colors of light except red light, which it reflects. State the reason why green photosynthesizing plants appear green. 3.8.3 State that chlorophyll is the main photosynthetic pigment. Define pigment: List the pigments that usually contribute to photosynthesis. Identify which is the main photosynthetic pigment.
  • 2. I-Shou International School IB Biology The diagram below shows the structure of photosynthesis. Identify the region that captures sunlight and the region that embeds itself in the chloroplast membrane. (from hlorophyll/chlorophyll_h.htm) 3.8.4 Outline the differences in absorption of red, blue and green light by chlorophyll. (from projects/steer/chloro.htm) The graph above shows the absorption of various wavelengths of light by chlorophyll a. Deduce from the graph why plants containing chlorophyll appear green. Outline the absorption of red, blue, & green light by chlorophyll a.
  • 3. I-Shou International School IB Biology 3.8.5 State that light energy is used to produce ATP, and to split water molecules (photolysis) to form oxygen and hydrogen. State the reactants and products of the “light reaction” of photosynthesis Define photolysis in relation to biology and light: Different isotopes of an element have different numbers of neutrons in their nucleus, which gives different isotopes different atomic masses. Most naturally occurring oxygen has an atomic mass 16 18 of 16 ( O), but another isotope has an atomic mass of 18 ( O). Deduce the source of the O2 gas molecules produced in photosynthesis by using the data below. Results Reactant 18 C O2 18 H O2 CO2 0.85 0.01 H2O 0.01 0.85 2 O 0.01 0.85 3.8.6 State that ATP and hydrogen (derived from the photolysis of water) are used to fix carbon dioxide to make organic molecules. Photolysis creates hydrogen ions. State where that hydrogen is used. Does this process use light energy? If no, where does the energy to do photolysis come from? 3.8.7 Explain that the rate of photosynthesis can be measured directly by the production of oxygen or the uptake of carbon dioxide, or indirectly by an increase in biomass. Define rate: Explain three ways that photosynthesis can be measured and indicate if each method is direct or indirect. Measurement Explaination 1) direct / indirect 2) direct / indirect 3) direct / indirect
  • 4. I-Shou International School IB Biology 3.8.8 Outline the effects of temperature, light intensity and carbon dioxide concentration on the rate of photosynthesis. Sketch and annotate graphs showing the effects of temperature, light intensity, & carbon dioxide concentration on the rate of photosynthesis. Do not forget to give your graph a title and to label the axes. Temperature Annotations / details Light Intensity Annotations / details CO2 Annotations / details