Biology – Photosynthesis Exam
Questions and Answers
What is the equation of photosynthesis? - Answer-Carbon dioxide + water -> glucose +
oxygen (light over the arrow)
Where does photosynthesis occur? - Answer-Chloroplast
What are the stages of photosynthesis? - Answer-light dependent reactions and light
independent reactions
Where does the light dependant reaction occur? - Answer-In the thylakoid stacks/Grana
What happens in the light dependant reaction? - Answer-The thylakoid membrane
absorbs solar energy and uses the energy to split water into hydrogen and oxygen. The
oxygen is released from the chloroplast and the hydrogen is carried by the NAPH to the
stroma.
Why is the thylakoid membrane clear? - Answer-The thylakoid membrane is clear for
light to pass through
What do thylakoid stacks contain and how is it being in a stack useful? - Answer-
Thylakoid stacks contain chlorophyll which allow light absorption. Also due to being in
stacks it allows more surface area meaning more reactions from sunlight.
Where does the light independent reaction occur? - Answer-Stroma
What happens in the light independent reaction occur? - Answer-The Calvin cycle
occurs. CO2 and hydrogen enter a biochemical cycle which uses ATP to produce
glucose.
What useful about stroma? - Answer-It has a liquid interior that has enzymes which
allows reactions to be catalysts.
How are Light dependent and light independent linked? - Answer-They are linked
because they can't work without each other's products
How is carbon dioxide and water absorbed by the plant? - Answer-Carbon dioxide is
absorbed through the stomata through diffusion. Water is absorbed through the roots by
Osmosis.
How does temperature affect photosynthesis? - Answer-Due to photosynthesis involving
enzymes as the temperature increases the rate of photosynthesis increases until it
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