Science Starter #5 – 11/06/15
What is the main atmospheric reactant that
is used in photosynthesis and what is the
main atmospheric product made during
photosynthesis?
TURN IN LAB AND LETTERS ON FRONT TABLE
Notes 4.3
Calvin Cycle (Light
Independent)
Stage 2 of photosynthesis
CHAPTER 6
PG. 116-124
OVERVIEW OF
PHOTOSYNTHESIS
Calvin Cycle
CO2 + ATP + NADPH  C6H12O2 + ADP + NADP+
Calvin Cycle
•The goal of the Calvin Cycle is to
produce C6H12O6 (glucose)
•Occurs in the stroma
•Uses ATP and NADPH (from the
Light Reaction) to convert CO2
to glucose (C6H12O6)
•2 spins around cycle makes 1
molecule of glucose!
Calvin Cycle Summary
Reactants
Products
NADPH
(from Light
Reaction)
NADP+
ATP (from
Light
Reaction)
ADP
CO2
C6H12O6
Check Notes 4.2 to see
Light Reactions and how
these two reactions are
related to each other
What is the glucose used for?
Glucose can be used for:
1. Energy
a)
Mitochondria will break
down glucose to create ATP
for growth and
development
2. Storage
a)
Excess glucose can be stored
as starch and used later for
energy
Factors that Affect Photosynthesis
1. Temperature
• As temperature increases, the rate of photosynthesis
increases to a maximum and then decreases when temps
get too hot.
– The rate peaks at a certain temperature,
at which many of the enzymes that
catalyze the reactions become ineffective.
Also, the stomata begin to close, limiting
water loss and entry of carbon dioxide.
Which graph represents the affect of temperature on
the rate of photosynthesis?
Draw this graph in your notes
Factors that Affect Photosynthesis
2. Light Intensity
•Rate of photosynthesis increases as light intensity
increases
•However, at some point all available e- are
excited, and maximum rate of photosynthesis is
reached
Which of the graphs represents the effect of light
intensity on the rate of photosynthesis?
Draw the circled image in your notes
Factors that Affect Photosynthesis
3. Carbon Dioxide Levels
•Rate of photosynthesis increases as CO2 increases
•However, at some point a maximum rate of
photosynthesis is reached and any increase in CO2
will have no effect on photosynthesis rate
Which of the graphs represents the effect of light
intensity on the rate of photosynthesis?
Draw the circled image in your notes
Foldable Instructions
On the bottom half of your foldable:
1.
2.
3.
4.
5.
6.
7.
Title: Calvin Cycle
Goal of Calvin cycle
Location:
Reactants:
Products:
What is glucose used for?
Draw and label the Calvin Cycle (what shape is
it? What goes in? What goes out?)
8. Must be in color