CH 5 Energy Flashcards
Does A or B represent the absorbance spectra for chlorophyl a?
A
In the CAM pathway does CO2 uptake occur during the day or the night?
The night
In the CAM pathway does Calvin Cycle occur during the day or the night?
during the day
How does a chemosynthesizer get energy
They get energy from inorganic matter without the presence of light
What is physoilogically happening at the light compensation point for a photoautotroph?
There is a balance between the CO2 uptake from photosynthesis and the CO2 output from respiration
What is the net photosynthetic rate
The amount of photosynthesis after respiration
What is the gross photosynthetic rate
The amount of photosynthesis and respiration combined
How does the color of leaves in a forest relate to their height above ground?
Lighter green leaves at the top of canopies synthesize less chlorphyll
Darker green leaves toward the shrub layer synthesize more chloropyll to “scavenge” for available light
Are high light leaves thick or thin? Broad or less broad?
High light leaves and thick and less broad
Are low light leaves thick or thin? Broad or less broad?
Low light leaves are thin but more broad
Is the carboxylase reaction catalyzed by rubisco energy consuming or energy producing?
energy producing
Is the oxygenase reaction catalyzed by rubisco energy consuming or energy producing?
energy consuming
If the CO2:O2 ratio favors oxygen, will Rubisco favor photosynthesis or photorespiration?
photorespiration
When is photorespiration favored?
High or Low temp?
High or Low CO2:O2 ratio?
High temp, Low CO2:O2 ratio
When is photosynthesis favored?
High or Low temp?
High or Low CO2:O2 ratio?
Low temp, High CO2:O2 ratio
What conditions are advantageous for C4 or CAM photosynthesis?
Dry, hot conditions, low water availability
define Osmotroph
osmotrophs get nutrients by absorbing dissovled oragnic matter from their surroundings
define Detritivore
consumes dead or decaying matter
describe C3 photosynthesis
the first carbon compound that is produced is a 3-C compound.
Not able to regulate CO2:O2 ratios well.
Costs 2 fewer ATP per Calvin Cycle compared to C4
describe C4 photosynthesis
4-C compound created in the mesophyll cell. the 4-C compound is delivered to the byndle sheath cell where the Calvin cycle occurs. Then the left over 3-C compound is recycled back to the mesophyll cell
describe CAM photosynthesis
temporal separation of reactions
a 4-C compound is made and stored in the night and during the day the stomata close to prevent excess water loss. The stored 4-C compounds are used during the day for the Calvin Cycle
Which light response curve represents a high light plant, low light plant, and medium light plant?
A = High light plant
B = Medium light plant
C = Low light plant
