Photosynthesis
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Photosynthesis definition
How plants and algae make their own food - glucose
Whats different about algae
• They can be uni-cellular or multi-cellular organisms • They live underwater • Algae do not have leaves stems or roots
Word equation of photosynthesis
carbon dioxide + water —> glucose + oxygen
How are plants adapted for photosynthesis
• Large surface area, contains lots of chloroplasts, chloroplasts concentrated in top of leaf/palisade layer
Where does photosynthesis take place
Chloroplasts
How does water get into a plant
Water diffuses into the root hair cells Hairs provide a large surface area to maximise diffusion Water transpoted around the plant in xylem tubes Water evaporates Water is drawn up through the plant
How do gases get into an out of a plant
On the underside there are tiny holes Allows gases to diffuse into leaf Carbon dioxide diffuses into Oxygen diffuses out into atmosphere