Photosynthesis Flashcards
Define Photosynthesis
The process in which plants use carbon dioxide and water to produce food
Who exactly does photosynthesis?
Autotrophs
List two of photosynthesis’ benefits
Food production
Oxygen production
What are photons?
Packets of energy of fixed quantity
Shorter wavelength, the _______ energy per photon
more
Thin flat surface _________ surfae area for light absorption
Increases
What is stomata?
Pores in bottom surface of leafs, let CO2 in
What are pigments?
Molecules that absorb some w/lengths of light while reflecting other w/lengths of light
why is the color of a pigment what it is?
Color is that of the w/lengths reflected
Photosynthetic Pigments of Plants
Chlorophyll a
Chlorophyll b
Carotenoids
What is the photoelectric effect?
Removal of an electron from a molecule by light
Photoelectric effect occurs when protons _____________ to electrons
Transfer energy
Explain what happens during calvin cycle:
ATP & NADPH used to power reactions that combine CO2 forming glucose
Photosystem I is supplied with:
Chlorophyll a
Photosystem II is supplied with:
Chlorophyll b
Photosystems and making ATP & NADPH
Step 1: ______ Absorbs light first
Photosystem II
Photosystems and making ATP & NADPH
Step 2: ________ excited and caught by primary ________ acceptor
electrons, electron
Photosystems and making ATP & NADPH
Step 3: Electrons lost are replaced by splitting ______, producing _____ as a byproduct
H2O, O2
Photosystems and making ATP & NADPH
Step 4: Electrons travel down ___________________, to NADP+ forming NADPH
Electron transport chain
Light Dependent Reactions require presence of _______
Light
Light dependent reactions occur in __________ of chloroplasts
Thylakoids
Light dependent reactions use energy from light to produce ________ and ________
ATP, NADPH
When light dependent reactions occur, ________ is produced as a by-product
Oxygen
Where does the calvin cycle takes place?
Chloroplast stroma
ATP & NADPH from light reactions used to combine _______ into glucose
CO2
Greenhouse gases: Main one
Carbon Dioxide
Greenhouse gas examples:
Methane, water vapor, nitrous oxide, ozone
Increase atmospheric CO2 levels: ________Temperature
Increase
Decrease atmospheric CO2 levels: ________Temperature
Decrease
Cellular respiration adds ________ to atmosphere
CO2
Photosynthesis removes _________ from atmosphere
CO2
Calvin Cycle steps
1: Carbon fixation
2: Reduction
3: Release of one molecule of G3P
4: Regeneration of RuBP
