Chapter 10- Photosynthesis Flashcards
What is the electromagnetic spectrum in relation to light absorption?
The EM is the entire range of electromagnetic energy or radiation; visible light is composed of wavelengths that produce color we can see
What are the input and output requirements of the Calvin cycle and light reactions?
Light reactions; They take in CO2 and breathe out O2 and also form sugars from CO2 using ATP and NADPH
Calvin cycle: Begins with incorporating CO2 into organic molecules and also forms sugar from CO2 using ATP and NADPH
What are the noncyclic and cyclic electron flows of light reactions?
Linear: Primary pathway that involves both photosystems and produces ATP/NADPH using light energy
Cyclic: uses only photosystem I and produces ATP but not NADPH
What is the role of the ETC in light reactions?
It acts as a series of protein complexes that transfer excited electrons from their initial light absorbing pigment into their final acceptor
Transforms light energy to chemical energy
What are the cause and effects of photorespiration?
Causes: Dehydration in plants, plants stomata close on hot days to conserve water which limits photosynthesis
Effects: Closing the stomata reduces Co2 and causes O2 to build up, these condtions result in photorespiration
What is the relationship between the structure of chloroplasts and photosynthesis?
Light energy absorbed by chlorophyll drives the synthesis of organic molecules in the chloroplasts
Chloroplasts are the site of photosynthesis
How do C4 and CAM plants minimize photorespiration?
C4: Limit PR by incorporating CO2 into four carbon compounds in the mesophyll cells
CAM: Like succulents, open their stomata at night incorporating CO2 into organic acids
What is the cycling of CO2 in photosynthesis?
CO2 from the atmosphere is absorbed by plants and used as building blocks to create organic compounds; it is transferred through a food chain and ‘fixed’ and eventually returns to the atmosphere when the organism decomposes or exhales
