Photosynthesis vs. Cellular Respiration

_______ converts light energy into chemical energy.

Where do Photosynthesis: light-dependent reactions take place?

• Mitochondria

• Chloroplasts

• Stroma

• Thylakoid membranes

Answer explanation

Light-dependent reactions happen in the thylakoid membrane of the chloroplasts and occur in the presence of sunlight. The sunlight is converted to chemical energy during these reactions. The chlorophyll in plants absorbs sunlight and transfers it to the photosystem, which is responsible for photosynthesis.

What is the input of Light-Dependent Reactions? What is the output? (Please write or type the answer)

Answer explanation

Input: Sunlight(light energy), H2O(water), NADP+, ADP

Output: NADPH, ATP, O2(Oxygen, a waste product)

Light-independent reactions, aka the ______ Cycle.

Light-independent reactions are fueled by light in the same way as light-dependent reactions.

• TRUE

• FALSE

Answer explanation

FALSE: (The old term “dark” reactions can be misleading since light-independent reactions don’t have to occur in the absence of light or at night—they just aren’t fueled by light like the light-dependent reactions.)

_______ uses stored chemical energy to “fix” CO2 and create a product that can be converted into glucose.

Where are light-independent reactions located?

• Inside a plant cell

• Chloroplast

• Stroma

• DNA

What is the input of Light-Independent Reactions? What is the output? (Please write or type the answer)

Answer explanation

Input: CO2(carbon dioxide), NADPH, ATP

Output: NADP+, ADP, G3P (two G3P can be made into C6H12O6)

________ is the process that breaks down glucose and produces ATP

• Photosynthesis

• Cellular Respiration

• Mitosis

How much ATP does cellular respiration produce?

• 4

• 2

• 34

• 38