Ch. 6 and 7 ** Flashcards
Light dependent reactions (3)
- during: ____
- splits ____ molecules into =______
- is possible due to ___ in ____
- During photosynthesis
- water molecules are split = oxygen molecules are released
Is possible due to chlorophyll found in the plants chloroplasts
Light independent reactions (2)
- during: ______
- uses_____and splits____molecules into=____
- During photosynthesis
- use ATP and electrons split from water molecules = reduce carbon dioxide and form carbohydrate molecules
Oxygen (O2) ***
This gas is a byproduct of water splitting during the light reactions
Glucose (C6H12O6) ***
- Is the carbohydrate product of photosynthesis
- contains the chemical energy converted from sunlight and the fixed carbon from atmospheric CO2
- glucose, contains the chemical energy converted from sunlight
Carbon Dioxide (CO2) ***
CO2 gas enters plant cells from the atmosphere. The carbon atoms are incorporated into organic sugar molecules
- enters cell
- carbon = organic sugar molecules
Water (H2O) ***
Water is split during the light reactions. Split water molecules release electrons that replace electrons lost by excited chlorophyll molecules
- water is split
- replaces lost electrons
Reactants of photosynthesis
Water
Carbon dioxide
Products of photosynthesis (3)
Oxygen
Water
Glucose
Organic molecules =
Food
Autotroph
Organism that MAKES organic molecules (food)
Ex: plant
Heterotroph
Organism that must obtain organic molecules from elsewhere (food)
Ex: bears
Cellular respiration (3)
- is the :_____of ____ to make ____
- the reverse of :_____
- happens to: _______ during _____
Break down of organic molecules to make energy (ATP)
- the reverse of photosynthesis
- occurs in plants/animals day/night
Aerobic respiration
- made from which 2 products of photosynthesis
(_________ and __________) - products make Aerobic respiration possible =
- Made from the two products of photosynthesis, OXYGEN and carbohydrates such as GLUCOSE
- make aerobic cellular respiration possible and thus provide food for the entire world
Water + carbon dioxide *****
In the presence of radiant energy (light) and chlorophyll =
= oxygen + sugar + water
- light provides the energy
- chlorophyll serves the function of a catalyst
Visible light
400- violet 500 - blue / green 600- yellow / orange 700 - orange / red 750- red
Wavelengths (3)
- are absorbed by the leaf
- green wavelengths reflect off the leaf
- absorbs red = reflects “green”
- when sunlight hits the plant, the chlorophyll pigment in the leaf absorbs red and blur wavelengths of visible light and reflects the wavelengths that our eyes perceive as green
Why do colors of accessory chloroplast pigments become visible in autumn
Other accessory (non-green) chloroplasts pigments are present in leaves of green plants and play a secondary role in the photosynthetic process by capturing energy from wavelengths of light not captured by the chlorophylls.
When autumn’s cooler temperatures cause plants to reduce their production of chlorophyll, these pigments become visible and are responsible for the familiar colors of fall
Cold temps=less chlorophyll= visible pigments= fall colors
Soluble (dissolvable) pigments
Higher or lower on the paper?
Will be pulled higher than less soluble ones as the solvent diffused into the paper
Carotene
- color
- placement
The yellow - orange band moving along with the solvent front
(Highest one)
Xanthophylls
- color
- placement
The lighter yellow bands (there may be 2) just beneath the carotene
Chlorophyll B
- color
- placement
The lowest band of yellow-green band
3rd highest one
Chlorophyll A
- color
- placement
The uppermost bright blue-green band
Lowest one
Air spaces within the leaf and specialized structures (stoma) are in the
In the epidermal layer on the surfaces of leaves permit movement of gases into and out of leaves. Stoma are more abundant on the lower surfaces of the leaves of most plants
- epidermal layer
- Allow movement of gases in and out of leaf
Radius =
One half of the diameter
