1. Photosynthesis: Life from Light and Air Do now: Where in the cell does photosynthesis happen? What do plans need to grow?

2. Plants are energy producers
Like animals, plants need energy to live
unlike animals, plants don’t need to eat food to make that energy
Plants make both FOOD & ENERGY
animals are consumers
plants are producers

3. How do plants make energy & food?
Plants use the energy from the sun
to make ATP energy
to make sugars
glucose, sucrose, cellulose, starch, & more
sun
ATP
sugars

4. Using light & air to grow plants
Photosynthesis
using sun’s energy to make ATP
using CO2 & water to make sugar
Happens in chloroplasts
allows plants to grow
makes a waste product
oxygen (O2)
(ATP) = used to build the sugar
→ glucose + oxygen
carbon
dioxide
sun
energy
+ water +
6CO2
6H2O
C6H12O6
6O2
sun
energy → +

5. What do plants need to grow?
The “solar power plant” for making energy & sugars
chloroplast
Fuels
sunlight
carbon dioxide
water
The Helpers
enzymes
Make ATP! Make sugar! I can do it all… And no one even notices!
sun
CO2
ATP
sugars
enzymes
H2O

6. Chloroplasts are only in plants cells
animal cells
plant cells

7. Chloroplasts absorb sunlight & CO2 Leaf Leaves CO2
Chloroplasts in cell
Chloroplast
Chloroplasts
contain
Chlorophyll
Chloroplast
make ENERGY & SUGAR

8. So what does a plant need?
Bring In
light
CO2
H2O
Let Out O2
Move Around
sugars
leaves
stem
roots
6CO2
6H2O
C6H12O6
6O2
light
energy → +

9. How do plants get water?
Water evaporates from the stomates in the leaves
This motion pulls water up from roots
Like with a straw, more water is pulled up tree from ground

10. Stomates & Guard Cells guard cell stomate Function of stomates
Lets CO2 in
Lets O2 out
Lets H2O out
gets to leaves for photosynthesis
Function of guard cells
open & close stomates
guard cell
stomate

11. Guard cells & Homeostasis
keeping the internal environment of the plant balanced
Stomates open
let CO2 in
needed to make sugars
let H2O out
needed for photosynthesis
let O2 out
get rid of waste product
Stomates close
if too much H2O is evaporating

12. Xylem
carry water up from roots

13. Phloem: food-conducting cells
carry sugars around the plant wherever they are needed
new leaves
fruit & seeds
roots

14. glucose + oxygen → carbon + water + energy
How are they connected?
Photosynthesis
6CO2
6H2O
C6H12O6
6O2
light
energy → +
→ glucose + oxygen
carbon
dioxide
sun
+ water +
Respiration
glucose + oxygen → carbon + water + energy
dioxidee
C6H12O6
6O2
6CO2
6H2O
ATP → +