topic 9 learning outcomes.docx

topic 9 learning outcomes.docx - Topic 9 learning outcomes...

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Topic 9 learning outcomes 1. Photosynthesis a. Convert solar energy into chemical energy. Makes organic molecules from CO2 & other inorganic molecules b. Nourishes entire living world c. Autotrophs sustain selves w/o eating derived from other organisms. Producers. i. Most plants are photoautotrophs, use sunlight energy to make organic molecules from H2O & CO2 ii. Heterotrophs obtain organic material from other organisms. Consumers of biosphere 2. Parts of chloroplast? Stroma, thylakoids, thylakoids space, grana a. Have 2 membranes around central aqueous space (stroma) b. In stroma is elaborate system of interconnected membranous sacs called thylakoids c. Interior of thylakoids make thylakoid space d. Thylakoids stacked in columns called grana e. Green from chlorophyll: absorb sunlight 3. Mesophyll tissue a. Chloroplasts mainly found here b. Usually have about 40-50 chloroplasts in 1 cell 4. Stomata a. Microscopic pores that allows CO2 enter & O2 exit leaf 5. Veins in plant leaves? a. deliver H2O from roots & carry off from mesophyll cells to non-photosynthesis areas of plant 6. photosynthesis equation a. 6CO2 + 6H2O + LIGHT NRG C6H12O6 + 6O2 b. H2O is oxidized (lose e) & CO2 is reduced (gain e) 7. 2 parts of photosynthesis? a. Light reactions (photo part) & calvin cycle (synthesis part) 8. Light reactions a. @ thylakoids b. Enzymatic splitting of H2O c. Release of O2 d. Reduction of NADP+ to NADPH e. Generation of ATP & NADPH (chemical energy) 9. Calvin cycle a. in stroma b. Forms sugar from CO2, using ATP & NADPH from light reactions 10. Light reactions & calvin cycle reactants & products a. Light reactant: H2O light product: O2 b. Calvin cycle reactant: CO2 calvin cycle product: glucose 11. Electromagnetic energy & electromagnetic spectrum a. Light. Travels in rhythmic waves. Distance between crests is called wavelength b. Displays range of wavelengths of electromagnetic radiation
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Topic 9 learning outcomes 12. Where is visible band of light wavelengths? a. 380-750nm 13. Colours. Lengths of wavelengths. & energy levels a. Length from shortest to longest: indigo, blue, aqua, green, yellow, orange, red, dark red b. Energy levels: higher energy at indigo, lower energy at dark red 14. Pigments a. Substances that absorb visible light b. Different ones absorb different wavelengths c. Wavelengths not absorbed are reflected d. Leaves appear green bc chlorophyll reflects & transmits green light 15. Absorption spectrum & action spectrum a. Absorption spectrum: Graph plotting a pigment’s light absorption versus wavelength b. Action spectrum: Plots rate of photosynthesis versus wavelength c. Results of both spectrsa show photosynthetic reactions rely on light absorption 16. Carotenoids a. Make up xanthophylls & carotenes.
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