1. Aim: Photosynthesis November 12, 2015 Warm-up:
How could you teach photosynthesis to others?
HW: Photosynthesis Regents Questions

2. Plants are energy producers
Like animals, plants need energy to live
Plants don’t need to eat food to make that energy
PLANTS are PRODUCERS

3. How do plants make energy & food?
Plants use the energy from the sun to make:
ATP energy
Sugars
SUN
ATP
sugars

4. Photosynthesis → glucose + oxygen → carbon dioxide sun energy
USES:
Sun’s energy to make ATP
CO2 & water to make sugar
OCCURS in CHLOROPLASTS
WASTE PRODUCT oxygen (O2)
(ATP) = used to build the sugar
→ glucose + oxygen
carbon
dioxide
sun
energy
+ water +
CO2
H2O
C6H12O6
6O2
sun
energy → +

5. Structure of a Chloroplast
1. Thylakoids – flattened disks containing chlorophyll
2. Grana – a stack of thylakoids
3. Stroma – the space between grana

6. What do plants need to grow?
The “factory” 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
enzymes
H2O
sugars

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

8. Leaf Structure xylem (water) phloem (sugar) cuticle epidermis
palisades
layer
spongy
layer
stomate
guard cells

9. Function of Leaf Structures
Cuticle
waxy coating reduces water loss
Epidermis
skin protecting leaf tissues
Palisades layer
high concentration of chloroplasts
collecting sun’s energy
photosynthesis
Spongy layer
air spaces
gas exchange

10. Stomates & Guard Cells guard cell stomate Function of STOMATES:
CO2 in
O2 out
H2O out
Function of GUARD CELLS:
open & close stomates
guard cell
stomate

11. Transpiration Water evaporates from the stomates in the leaves
pulls water up from roots
more water is pulled up tree from ground

12. Do not contain chloroplasts
Xylem
carry water up from roots
Do not contain chloroplasts

13. Phloem: food-conducting cells
carry sugars around the plant wherever they are needed

14. sun
CO2
PLANT LIPIDS
ATP
H2O
enzymes O2
sugars