Photosynthesis Flashcards
Photosynthesis
- the most important chemical process on earth
- the process which plants use energy from the sun to make sugars from carbon dioxide and water
What does Photosynthesis Provide?
food and energy for all living creatures who eat plants
Who relies on Photosynthesis?
Plants
Why do Plants rely on Photosynthesis?
to produce glucose
Electromagnetic Spectrum
- radio
- microwave
- infrared
- visible
- ultraviolet (UV)
- x-ray
- gamma ray
What light do humans see?
visible
Color
- the color of an object is due to the way objects interact with light
- the color perspective is the wavelength of light that is reflected and the rest of the wavelengths are observed
Pigments
molecules (protiens) that absorb light energy and determine the color of an object
True or False: pigments reflect, transmit and absorb various wavelength on the electromagnetic spectrum?
Ture
Where are pigments located in the Plant?
Chlorophyll
Chlorophyll A
- absorbs blue-violet and red light, reflects green light
- Primary Pigment in Photosynthesis
Chlorophyll B
- absorbs blue and orange light, reflects yellow - green
- assist chlorophyll a in absorbing light energy
Carotenoids
reflect yellow-orange/brown, absorbs everywhere else
Where does photosynthesis occur?
Chloroplasts
Do Plants have many pigments?
Yes, that accounts for the variation of colors in plants.
True or False: Chlorophyll A is only responsible for photosynthesis
False; both a and b are responsible for photosynthesis
Photosynthesis equation
CO2 + H20 —–> C6 H12 O6+O2
(Carbon Dioxide + Water —–> Glucose + Oxygen)
Photosynthesis Reactants
CO2 & H20
(Carbon Dioxide & Water)
Photosynthesis Products
C6 H12 O6 & O2
(Glucose ((Sugars)) & Oxygen)
Photosynthesis Reactions
- Light - Dependent Reaction
- Light - Independent Reaction
Light - Dependent Reaction
AKA: Light Reaction
- solar energy is absorbed by pigments in the chloroplast and is used to make ATP and NADPH
Light - Independent Reaction
AKA: Calvin Cycle
- ATP & NADPH are used to make sugars from H2O & CO2
What do Plants Start Photosynthesis with
Water and Carbon Dioxide = Bulid glucose
What do Plants finish Photosynthesis with?
Oxygen - released into the atmosphere
Glucose - used for energy or stored for later usages
Limiting Factors of Photosynthesis
- Light Intensity
- Temperature
- CO2 Levels
Light Intensity
- as light intensity increases the rate of photosynthesis will also increase
- as light becomes faster, it cant photosynthesize faster
- light is a necessary reactant to catalyze the reaction (photosynthesis)
Temperature
- the process of photosynthesis takes place very slowly at low and high temperatures
- a plant photosynthesis faster at warmer temperature, due to it being an ENZYME CATALYZED REACTION
CO2 Levels
- the more CO2 a plant is exposed to, the faster photosynthesis will occur
- CO2 = reactant of photosynthesis
- More reactant = more product
