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Photosynthesis
- 8. Image source unknown. Question from the IBO .
- 10. e -
- 16. Useful light dependent reaction animations:
- 22. Simple Calvin Cycle animations:
- 24. plateau At low CO 2 concentration, rate is positively correlated with concentration CO 2 is a substrate in an enyme-catalysed light-dependent reaction.
- 25. At low light intensity, rate of photosynthesis is proportional to light intensity. plateau
- 26. Increased temp. gives increased energy and increased rate of photosynthesis Optimum temperature Above the optimum temp., enzymes are denatured and rate drops steeply. Which enzymes are used in respiration?
- 29. Light intensity Rate of photosynthesis What are the conditions of each of these trials?
- 31. For more help and useful animations, visit: http://sciencevideos.wordpress.com
Hinweis der Redaktion
- Title slide. Bandung International School.
- Photosynthesis title, definition and equation.
- Why does a leaf look green?
- Action spectrum of photosynthesis shows wavelengths used for light dependent reactions. Different colours are different wavlengths. The green region is not used, so green light is reflected and seen.
- Absorption spectrum of chlorophyll a vs action spectrum of photosynthesis. Chlorophyll b is used to ‘fill the gaps’ in the action spectrum.
- Laminaria saccharina uses carotenoids as accessory pigments. Light is limited underwater.
- Chloroplast: colour TEM, parts and functions.
- Chloroplast: structure’s relationship with function
- Light Dependent Reactions title and brief overview.
- Photoactivation of chlorophyll – electrons are excited and return to their original state, releasing oxygen.
- Photolysis of water produces high-energy electrons, H+ protons and oxygen.
- Protons are pumped into stroma using energy from electrons
- Photosystem I is activated
- Non-cyclic phosphorylation produces ATP.
- Reduction of NADP+ by ferredoxin.
- Links to light dependent reactions animations.
- Light Independent Reactions title – quick overview.
- Carbon fixcation using CO2 and rubisco
- Reduction of glycerate 3-phosphate
- Carbohydrate formation and re-generation of RuBP
- Calvin cycle overview.
- Calvin cycle animation links.
- Methods of measuring the rate of photosynthesis.
- CO2 affects rate of photosynthesis. CO2 is the substrate in carbon fixation (Calvin cycle) – rubisco is the enzyme.
- Light intensity affects rate of photosynthesis.
- Temperature affects the rate of photosynthesis. Remember enzyme theory. Enzymes used in respiration: rubisco is the main one. ATP synthase can also be denatured.
- Team analogy for the limiting factors theory. Time to vote off the weakest link.
- Explain the effects of limiting each of the three factors on the process of photosynthesis. It’s not enough to just say “it slows down.”
- This graph suggests that CO2 is more important than temperature. Why?
- Iron is limiting – seeding algae with iron stimulates algal blooms. Iron is used in ferroxidase – responsible for reduction of NADP+ in the light dependent reactions. Results with CO2 were short-term. Levels dropped in the immediate area, but the seeding is too expensive to work. Pros: possible reduced CO2 levels, algal blooms provide food for grazers and thus fisheries. Cons: large blooms block light to lower levels, may cause eutrophication; Diatoms block gills of some species; iron seeding may encourage blooms of toxic algae; who owns the ocean?
- Contact gurustip@yahoo.co.uk or visit the site for more information.