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Photosynthesis

Photosynthesis

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Photosynthesis

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  1. Photosynthesis

  2. Photosynthesis • Occurs in plant chloroplasts, producing g________ and ATP.

  3. Photosynthesis • Occurs in plant chloroplasts, producing g________ and ATP. • Can be summarised as: • 6H20 + 6CO2  C6H12O6 + 6O2 • Water + Carb.Diox  Glucose + Oxygen

  4. Photosynthesis • Occurs in plant chloroplasts, producing g________ and ATP. • Can be summarised as: • 6H20 + 6CO2  C6H12O6 + 6O2 • Water + Carb.Diox  Glucose + Oxygen • Light phase (the photo part) • Chlorophyll absorbs light. The energy is used to do 2 things: • * Split water into hydrogen & oxygen (the hydrogen goes to fill a hydrogen carrier NADP  NADPH2. O2 is released as a waste product) • * Use some of the energy which charges up ADP to ATP. • Light independent phase (the synthesis part) • -

  5. Photosynthesis • Occurs in plant chloroplasts, producing g________ and ATP. • Can be summarised as: • 6H20 + 6CO2  C6H12O6 + 6O2 • Water + Carb.Diox  Glucose + Oxygen • Light phase (the photo part) • Chlorophyll absorbs light. The energy is used to do 2 things: • * Split water into hydrogen & oxygen (the hydrogen goes to fill a hydrogen carrier NADP  NADPH2. O2 is released as a waste product) • * Use some of the energy which charges up ADP to ATP. • Light independent phase (the synthesis part) • Occurs in the stroma • Hydrogen and ATP from the light phase combine with C02 from atmosphere to form G-3-P (glyceraldehyde-3-phosphate for all you chemistry geeks :o) • G-3-P is then changed into carbohydrate (mainly sucrose), amino acids, or fats in the cytoplasm

  6. Factors affecting photosynthesis • Enzymes – run photosynthesis. So anything that affects enzymes, affects photosynthesis.

  7. Factors affecting photosynthesis • Enzymes – run photosynthesis. So anything that affects enzymes, affects photosynthesis. • Temperature – cold = reduced photosynthesis. Speeds up when warmer, but reaches optimum and photosynthesis slows down again if it’s too hot. Eventually enzymes become denatured & p. stops.

  8. Factors affecting photosynthesis • Enzymes – run photosynthesis. So anything that affects enzymes, affects photosynthesis. • Temperature – cold = reduced photosynthesis. Speeds up when warmer, but reaches optimum and photosynthesis slows down again if it’s too hot. Eventually enzymes become denatured & p. stops. • Amount of C02 – like temp. Up to a point and then levels off.

  9. Factors affecting photosynthesis • Enzymes – run photosynthesis. So anything that affects enzymes, affects photosynthesis. • Temperature – cold = reduced photosynthesis. Speeds up when warmer, but reaches optimum and photosynthesis slows down again if it’s too hot. Eventually enzymes become denatured & p. stops. • Amount of C02 – like temp. Up to a point and then levels off. • Absorption of C02 – opening/closing of stomata = prevents water loss, but also if stomata is shut, no C02 is getting in. P. slows.

  10. Factors affecting photosynthesis • Enzymes – run photosynthesis. So anything that affects enzymes, affects photosynthesis. • Temperature – cold = reduced photosynthesis. Speeds up when warmer, but reaches optimum and photosynthesis slows down again if it’s too hot. Eventually enzymes become denatured & p. stops. • Amount of C02 – like temp. Up to a point and then levels off. • Absorption of C02 – opening/closing of stomata = prevents water loss, but also if stomata is shut, no C02 is getting in. P. slows. • Chlorophyll uses red/blue wavelengths of light (green is reflected so green = low rates of p.

  11. Factors affecting photosynthesis • Enzymes – run photosynthesis. So anything that affects enzymes, affects photosynthesis. • Temperature – cold = reduced photosynthesis. Speeds up when warmer, but reaches optimum and photosynthesis slows down again if it’s too hot. Eventually enzymes become denatured & p. stops. • Amount of C02 – like temp. Up to a point and then levels off. • Absorption of C02 – opening/closing of stomata = prevents water loss, but also if stomata is shut, no C02 is getting in. P. slows. • Chlorophyll uses red/blue wavelengths of light (green is reflected so green = low rates of p. • Chlorophyll and minerals – more chlorophyll = more p. Plants need Mg so if lacking, leaves turn yellow and low p rates.

  12. Photosynthesis • http://www.youtube.com/watch?v=C1_uez5WX1o • http://www.youtube.com/watch?v=mYbMPwmwx88 • http://www.youtube.com/watch?v=zEgIO9Kq2_Y&feature=related