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WorksheetsPhotosynthesis and Related Concepts Quiz
Total questions: 28
Worksheet time: 14mins
What is the overall chemical equation for photosynthesis?
6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂
6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 CO₂
6 CO₂ + 6 H₂O → C₆H₁₂O₆ + H₂O
6 CO₂ + 6 H₂O → C₆H₁₂O₆ + O₂
Where do light-dependent reactions occur?
Thylakoid membranes
Stroma
Grana
Stroma lamellae
Where does the Calvin cycle occur?
Stroma
Thylakoid membranes
Grana
Stroma lamellae
What is the main pigment involved in photosynthesis?
Chlorophyll a
Chlorophyll b
Carotenoids
Xanthophylls
Which wavelengths of light does chlorophyll a absorb?
Violet-blue and red light
Green and yellow light
Blue and green light
Red and orange light
What structure connects grana in chloroplasts?
Stroma lamellae
Thylakoid membranes
Stroma
Grana
What molecules are produced when PSII splits water?
O₂, H⁺, electrons
O₂, H₂O, electrons
CO₂, H⁺, electrons
O₂, ATP, electrons
What is the primary product of the Calvin cycle?
G3P (glyceraldehyde-3-phosphate)
ATP
NADPH
RuBP
Which enzyme is responsible for carbon fixation?
Rubisco
ATP synthase
NADP reductase
Phosphoglycerate kinase
What is the term for a light particle?
(a)
Which pigment protects by scavenging free radicals?
Carotenoids
Chlorophyll a
Chlorophyll b
Xanthophylls
What is the purpose of cyclic photophosphorylation?
Make extra ATP only
Make extra NADPH only
Make both ATP and NADPH
Store energy in RuBP
Which 5-carbon molecule binds CO₂ during photosynthesis?
RuBP
G3P
Rubisco
ATP
Which photosystem is associated with P680?
Photosystem II
Photosystem I
Photosystem III
Photosystem IV
What is the final electron acceptor in PSI?
NADP⁺
O₂
ATP
RuBP
What is the difference between absorption spectrum and action spectrum?
Absorption: wavelengths absorbed; Action: wavelengths that drive photosynthesis
Absorption: wavelengths reflected; Action: wavelengths absorbed
Absorption: wavelengths transmitted; Action: wavelengths reflected
Absorption: wavelengths emitted; Action: wavelengths absorbed
Why are leaves green in summer but red/orange in fall?
Chlorophyll degrades → carotenoids remain visible
Carotenoids degrade → chlorophyll remains visible
Chlorophyll and carotenoids degrade simultaneously
Chlorophyll increases → carotenoids decrease
What is the relationship between energy and wavelength?
Energy is inversely proportional to wavelength
Energy is directly proportional to wavelength
Energy is independent of wavelength
Energy is proportional to the square of wavelength
Why is PSII essential for oxygen production?
It splits water to replace electrons → releasing O₂
It absorbs light to produce O₂ directly
It transfers electrons to PSI to produce O₂
It generates ATP to drive O₂ production
Why does the Calvin cycle require ATP and NADPH?
ATP = energy; NADPH = reducing power to build sugars
ATP = reducing power; NADPH = energy to build sugars
ATP = energy; NADPH = energy to build sugars
ATP = reducing power; NADPH = reducing power to build sugars
What is the relationship between photosynthesis and respiration?
Photosynthesis stores energy; respiration releases it
Photosynthesis releases energy; respiration stores it
Photosynthesis and respiration both store energy
Photosynthesis and respiration both release energy
Why does photorespiration occur in hot, dry conditions?
Stomata close → CO₂ drops, O₂ rises → rubisco binds O₂
Stomata open → CO₂ rises, O₂ drops → rubisco binds CO₂
Stomata close → CO₂ rises, O₂ drops → rubisco binds CO₂
Stomata open → CO₂ drops, O₂ rises → rubisco binds O₂
Why does noncyclic photophosphorylation make both ATP and NADPH?
Electron flow goes from water → NADP⁺ through both photosystems
Electron flow goes from NADP⁺ → water through both photosystems
Electron flow goes from PSI → PSII through both photosystems
Electron flow goes from PSII → PSI through both photosystems
What happens if stomata close?
CO₂ ↓ and O₂ ↑
CO₂ ↑ and O₂ ↓
CO₂ and O₂ remain constant
CO₂ ↓ and O₂ ↓
What happens if PSI stops working?
NADPH decreases more than ATP
ATP decreases more than NADPH
Both ATP and NADPH decrease equally
Neither ATP nor NADPH decrease
What measures oxygen production?
Light-dependent reactions (PSII activity)
Calvin cycle activity
Cyclic photophosphorylation
Noncyclic photophosphorylation
Why do CAM plants open stomata at night?
Reduce water loss; store CO₂ as malate for daytime use
Increase water loss; store CO₂ as malate for daytime use
Reduce water loss; store CO₂ as ATP for daytime use
Increase water loss; store CO₂ as ATP for daytime use
What happens to a plant in high CO₂ but dim light?
Calvin cycle can continue briefly (limited by NADPH/ATP production)
Calvin cycle stops immediately
Calvin cycle continues indefinitely
Calvin cycle continues but produces no sugars
