Photosynthesis Flashcards
Define Photosynthesis
Way in which plants produce glucose and oxygen from Co2 and H2O
Chemical Formula for Photosynthesis
Chlorophyll
6CO2 + 6H2O —————–> C6H12O6 + 6O2
Light
Role of Photosynthesis
To make food and produce oxygen
Why is the dark stage necessary for the continuation of the light stage
Products of dark stage used in light stage
Role of stomata in photosynthesis
Gas exchange
Role of chlorophyll in photosynthesis
Absorb light
Name 3 products of the light dependent stage
ATP
Oxygen
NADPH
What does Atp stand for
Adenosine Triphosphate
Where in the cell does the dark stage take place
Chloroplast
Name 3 products of the light Independent Stage
Plant respiration
NADP+
Glucose
Why is it an advantage that chlorophyll contains a number of chemicals
So it absorbs more light
Outline the events of stage 3 (dark stage)
Energy from ATP NADPH from electrons NADPH from protons CO2 combines with electrons CO2 combines with protons Forms Glucose
Describe 2 ways to improve plant production in a greenhouse
Keep to optimum pH
Keep to optimum temperature
What particles are released from chlorophyll during the light dependent stage
Electrons
Give an account of the events of pathway 2
Electrons trapped by NADP and form NADP- H+ attracted to NADP- and forms NADPH Water splits into proton (H+) and electrons (e-) O2 is formed Electrons pass to chlorophyll ATP is formed
Involving an experiment showing photosynthesis what plant is used
Elodea
Why is elodea used
As its an aquatic plant and produces bubbles easily
How is the rate of photosynthesis measured
The amount of bubbles per unit of time
What labels are on the axis of the graphs
X-axis: Light intensity
Y-axis: Number of bubbles
Explain how temperature increase and increase CO2 concentration increases photosynthesis
Temperature: Increases enzyme activity
CO2: Increases supply of atoms to dark stage
Outline the events of pathway 1
Light energising electrons
Electrons from chlorophyll forms ATP
Electrons returned to chlorophyll
Name 2 sources of CO2 in the atmosphere
Respiration
and
combustion
Name a gas essential for the dark stage
Carbon Dioxide
Name and explain why 2 products of the light stage are essential for the dark stage
NADPH: Supplies Hydrogen
ATP: Supplies energy
Draw a diagram of Pathway 1
Draw a diagram of pathway 2
Draw a diagram of pathway 3
Draw a diagram of chloroplast
Draw a diagram of the structure of a leaf
State the role of Co2 and water in photosynthesis
Co2: supplies carbon
Water: supplies hydrogen
