Photosynthesis &
Cell Respiration
Chapters 8 & 9
Miss Colabelli
Biology CPA
Obtaining Energy


Autotrophs

Organisms that get their energy from the sun

Use photosynthesis to make ATP

Ex: plants
Heterotrophs

Organisms that get energy from eating foods

Ex: humans
Why is photosynthesis
important?

Makes organic molecules out of inorganic
molecules

Makes glucose (sugar) from sunlight

It begins ALL food chains and webs

Also provides oxygen gas to the
atmosphere
Photosynthesis = “putting
together with light”

Process that uses sunlight to turn water
and carbon dioxide into glucose

Plants use glucose as food

Autotrophs make glucose and
heterotrophs are consumers of it
Overview

Two parts to photosynthesis
 Light
reactions
 Require
sunlight to occur
 Creates ATP
 Also
 Calvin
and NADPH (a different form of energy)
makes O2 as a byproduct
Cycle
 Does
not require sunlight
 When
CO2, ATP, and NADPH make glucose
6CO2 + 6H2O
C6H12O6 + 6O2
Chloroplasts

Parts of the
chloroplast
 Thylakoids
 Flattened
sacs where
reactions occur
 Granum
A
stack of thylakoids
 Stroma
 Space
grana
between the
Light Reactions

During light reactions, the plant’s
_________________absorb the sunlight

First part of _________________

H2O + sunlight  O2

Occurs in the _________________ of the
chloroplast
Light Reactions

When __________ is split during these
reactions, oxygen gas is made as a
_________________

The sunlight is used to break down the
water and create ______and _________
Calvin Cycle

Second part of _________________

CO2  ______________

Occurs in the _____________ of the chloroplast
Rate of Photosynthesis

__________factors that affect the rate of
photosynthesis

____________intensity

_________ ____________ levels

____________
Cellular Respiration

Process that our cells use to break down food and create
______

Takes place in the ____________

Two Parts to Cellular Respiration (when ______ is present)


____________

____________ Respiration
Two parts to ____________(when O2 is not present)

____________

____________(alcoholic or lactic acid)
C6H12O6 + 6O2
6CO2 + 6H2O + ATP
Glycolysis
Process when glucose is broken down to make
____________ ____________, _______, and
____________
 Takes place in the ____________
 The pyruvic acid made can either go to
_________________ or ____________ respiration

 Depends
if there is ____________ or not
If there is oxygen present  ____________
respiration
 If oxygen is not present  ____________

Aerobic Respiration
Occurs only in the presence of
____________
 Happens in two stages

 ____________
cycle
 ____________ ____________ ____________

Occurs in _________________
____________(cytoplasm in the
mitochondria)
Krebs Cycle
Named after scientist ______
______
 Process takes pyruvic acid and
makes a molecule called
____________ _______ + ________
 Also makes some _______ ,
_______, _______

 These
are the needed _______ for the
electron transport chain
Electron Transport Chain

Uses products from the _______
_______ to make a lot of _______
for our cells

Occurs in the mitochondrial
______________ called _________

This process requires __________ in
order to work
Fermentation

Process that occurs if oxygen is
_______ present

Pyruvic acid will be fixed to become
_______ _______ or ___________
(depends on the organism)
Lactic Acid Fermentation

Occurs in our _______ as well as in some
_____________ to help make yogurts and
cheeses

In our bodies, lactic acid builds up as
_______ __________
Alcoholic Fermentation

Occurs in organisms such as __________

This process creates ______ and
__________ __________
 If
the CO2 is released, you make a
__________ alcohol (wine)
 If
CO2 is not released, you make a
__________ or __________ alcohol
(champagne)
Comparing Photosynthesis & Respiration
Photosynthesis
Function
Location
Cellular
Respiration
Energy
Breakdown
Chloroplasts
Reactants
C6H12O6 and O2
Products
CO2 and H2O
Equation
6CO2 + 6H2O 
C6H12O6 + 6O2
C6H12O6 + 6O2
6CO2 + 6H2O