Photosynthesis (Autotrophic Nutrition) How to plants make energy for themselves?

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Presentation transcript:

Photosynthesis (Autotrophic Nutrition) How to plants make energy for themselves?

What is Photosynthesis Photosynthesis: process of using solar energy to generate glucose that plants can use to make energy.

Where does photosynthesis take place? Chloroplast: site for photosythesis –Contains chlorophyll: pigment that activates photosynthesis & gives plants their green color

Stages of Photosythesis Light Reactions  needs the sun and water Dark Reaction  no light needed

Important parts of the cholorplast Thykloids: site of Light rxns. Grana: a bunch of thykloids Stroma: site of Dark rxns.

Light is used in order for split water in the thykloids. CALLED PHOTOLYSIS Water molecule is split Oxygen is freed into the atmosphere Two hydrogen atoms from molecules drive: NADP  NADPH ADP  ATP These two high energy molecules go into stage 2 of photosynthesis Step 1- Light Reactions

Copy and paste into browser animat/metabolism/photosynthesis.swf

Step 2: Dark Reactions (PS1) Light is not required Takes place in the stroma Given the name CARBON FIXATION (Calvin Benson Cycle) BECAUSE IT WILL NOW FIX CARBON DIOXIDE CHEMICALLY TO FORM GLUCOSE

Copy and paste link into browser to observe dark reaction bio/photosynthesis/photosynthsis%20anim ation.htm

Overall Chemical Equation 6 CO H 2 O+ LIGHT  C 6 H 12 O 6 +6 O 2 + 6H 2 O REVERSE OF CELL RESPIRATION