IB Photosynthesis

Order the following steps of photosynthesis in chronological order.

• NADPH and ATP is used to convert G3P into TP

• RuBP is regenerated through 10 molecules of triose phosphate

• An electron from chlorophyll a becomes "excited" and jumps into an ETC

• An electrochemical gradient is established with a high concentration of H+ inside of the lumen of the thylakoid. 

• ATP is generated through chemiosmosis and ATP synthase.

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Click the location of the light dependent reactions.

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NGSS.HS-LS2-5

Click the location of the light independent reactions.

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Sort the steps of photosynthesis into the light dependent or light independent reactions.

Groups:

(a) Light Dependent

,

(b) Light Independent

• Produces ADP

• Produces RuBP

• Produces Glucose

• Occurs in the stroma

• Requires light

• Produces NADP+

• Produces Oxygen

• Occurs in the thylakoid membranes

• Produces NADPH

• Produces ATP

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The action spectra for two different types of photosynthetic organisms are shown. Ulva, or seas lettuce, is a green marine alga composed of two layers of cells. The action spectrum for crop plants was plotted from an average of 22 species of plants.

• Ulva photosynthesizes more than crop plants at red wavelengths.

• Crop plants photosynthesize more than Ulva in green light.

• Photosynthesis by Ulva is highest in red light while that of crop plants is highest in blue.

• Both have zero photosynthesis at 750 nm.

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A summary diagram of photosynthesis is shown. Which molecule represents ATP?

• A

• B

• C

• D

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Which process occurs during the light-dependent reaction of photosynthesis?

• ATP, CO₂, and H₂O are priduced

• CO₂ is used to produce carbohydrates

• ATP and O₂ are produced.

• RuBP is phosphorylated

What is used to reduce NADP in the light-dependent reactions of photosynthesis?

• Conversion of ATP into ADP + P

• Electrons from Photosystem I

• Protons from the thylakoid space

• Oxygen released by the photolysis of water

Drag the molecule to the correct location on the diagram.

a

b

c

O₂

NADPH

C₆H₁₂O₆

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NGSS.HS-LS2-5

The graph shows atmospheric oxygen levels over time. About 2.5 billion years ago, a significant rise in atmospheric oxygen occurred. What was the cause of this rise?

• Photosynthesis by non-vascular land plants.

• Photosynthesis by vascular land plants.

• Oxygen produced by photosynthetic bacteria being released from the ocean into the atmosphere.

• Volcanic activity

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