1. Cell Energy: Photosynthesis & Respiration Notes

2. Plants get energy directly Animals get energy indirectly
I. Sources of Energy
A. Nearly all living things obtain energy _________ or ___________ from the energy of __________ captured in __________________.
directly
indirectly
sunlight
photosynthesis
Plants get energy directly
Animals get energy indirectly

3. II. Photosynthesis
The process by which a cell __________ the sun’s energy in _________ and uses it to ____________.
Takes place in the ______________ of plant cells.
Uses the sun’s light energy to change carbon dioxide and _______ into sugars (glucose) and ________.
captures
sunlight
make food
chloroplasts
water
oxygen

4. A. Two Stages of Photosynthesis
Stage 1: Chloroplast have a green __________ called _____________ that absorbs the sun’s _____ energy.
pigment
chlorophyll
light

5. Stage 2: The captured light energy is used to _________ ______ and ________ from water and carbon dioxide.
produce
sugar
oxygen
Oxygen exits through stomata on the underside of the leaf
Sugars produced are used by the plant cells for energy

6. Stage 2 continued Plant cells contain both and .
The chloroplasts in these cells
the carbon dioxide (waste) by cellular respiration (mitochondria).
chloroplasts
mitochondria
dispose (remove)
produced

7. Photosynthesis

8. B. The Photosynthesis Equation
Water H20
Carbon Dioxide CO2
Oxygen 02
Sugar (glucose) C6H12O6
sun’s light energy
6CO H2O C6H12O O2 carbon water glucose oxygen dioxide

9. Click on the link below and enter the web code to do an interactive activity on photosynthesis
web code: cep-1042

10. III. Energy From Food
Two ways cells get energy: ______________ & _________ ____________.
fermentation
cellular
respiration
fermentation
cellular respiration

11. A. Fermentation: cells break down glucose _________ oxygen.
without
Some __________ & fungi _____ _____ fermentation to get their energy.
Some ______ in organisms use fermentation when ____ enough _________ for cellular respiration.
Ex: When muscle cells run ____ of ________ they use _______________ to get energy. Fermentation makes _______ _____, which makes your __________ ______ as they tire.
bacteria
only
use
cells
not
oxygen
out
oxygen
fermentation
lactic
acid
muscles
ache

12. B. Cellular Respiration: cells break down glucose _____ oxygen.
with
Cells _______ ______ simple sugars (glucose) and _________ the ________ they contain.
Animals get __________ from the _____ they eat.
Plants get glucose from the process of __________________.
break
down
release
energy
glucose
food
photosynthesis

13. Takes place in _______________ of plant & animal cells
Chemical reactions need ________ and _________ a great deal of ________.
mitochondria
oxygen
release
energy

14. B. The Respiration Equation
Oxygen 02
Sugar (glucose) C6H12O6
Water H20
Carbon Dioxide CO2
Energy ATP
C6H12O O CO H2O + energy glucose oxygen carbon water ATP dioxide

15. IV. Comparing Photosynthesis & Respiration
Think of photosynthesis and respiration as __________ processes.
Photosynthesis _______ energy
Respiration __________ energy
opposite
stores
releases
energy storage
energy release

16. The two processes keep the level of _________________ and ________ fairly __________ in the earth’s atmosphere.
carbon dioxide
oxygen
constant

17. Photosynthesis makes the _______ & _________ mitochondria use in ____________.
sugar
oxygen
respiration
Respiration makes the __________________ & _______ chloroplasts use in ___________________.
carbon dioxide
water
photosynthesis