Autotrophic Nutrition Definition: when an organism makes (synthesizes) its own food using substances from the environment H2O, CO2 glucose “Changing light energy to chemical energy” 1

Importance of Photosynthesis: process used by some organisms to make their own food by using sunlight Ex. plants, algae Importance of Photosynthesis: food for plant food for animals that eat the plant O2 for other organisms 2

chloroplasts Location of Photosynthesis: leaves Occurs in plant (large surface area to absorb light) in cell organelles called leaves chloroplasts

Photosynthesis Chemical Reaction Happens in the chloroplast CO2 + H2O C6H12O6 + H2O + O2 Carbon dioxide + water glucose + water + oxygen Inorganic reactants Organic products 4

Leaf Structures Remember, this is where PHOTOSYNTHESIS takes place; in the chloroplast of the leaf cells! outer surface of leaf waxy layer to protect against water loss pores (openings) in bottom of leaf allow O2, H2O and CO2 in and out regulated by guard cells Guard cells- cells that swell or deflate to open/close stomates layer w/most chloroplasts most photosynthesis takes place here under epidermis Epidermis- Cuticle- Stomates- Stomate clip Guard cells- Palisade layer- Maintain homeostasis by REGULATING water loss & gas exchange 5

- organelles that contain chlorophyll Chloroplasts - organelles that contain chlorophyll air spaces in the leaf for CO2 and O2 exchange tubes that contain xylem and phloem for transport of water and food in plant What laboratory technique could we use to separate the colors that make up chlorophyll?? chromatography Spongy layer- Veins- 6

Leaf Diagram 8

What affects Photosynthesis? sun temperature water CO2 As CO2 ____in plants, photosynthesis ______. As light ______ in plants, photosynthesis ________ As amount of water ______ in plants, photosynthesis _______ Venus fly trap