IB Biology Topic 8

Which process is common to photosynthesis and cell respiration?

• Photolysis

• The Calvin cycle

• The Krebs cycle

• Chemiosmosis

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The diagram shows the structure of a chloroplast.

Where is chlorophyll located?

• A

• B

• C

• D

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ATP is needed to change products of the carboxylation of ribulose bisphosphate into triose phosphate.

What other substance is also needed?

• Rubisco

• NADP

• NAD

• Reduced NADP

What is reduced by Photosystem I ?

• ADP

• NADP

• NAD

• FAD

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

• ATP, CO₂ and H₂O are produced.

• CO₂ is used to produce carbohydrates.

• ATP and O₂ are produced.

• RuBP is phosphorylated.

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NGSS.HS-LS1-5

Which technological advance enabled Calvin to perform his lollipop experiment on the light-independent reactions of photosynthesis in 1949?

• Methods for tracing radioactive carbon incorporated in molecules produced by the alga Chlorella

• Development of electron microscopes enabling the molecules produced by the alga Scenedesmus to be viewed

• Methods for changing the wavelength of light shining on the alga Scenedesmus contained in the lollipop

• Development of X-ray diffraction techniques enabling the molecules produced by the alga Chlorella to be identified

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

• Conversion of ATP into ADP+P_i

• Electrons from Photosystem I

• Protons from the thylakoid space

• Oxygen released by photolysis of water

The electron micrograph shows part of a plant cell.

Where do the light-independent reactions of photosynthesis take place?

• A

• B

• C

• D

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Which molecule would first contain ¹⁴C if the alga Chlorella was grown in the presence of light and radioactive CO₂?

• Glycerate 3-phosphate

• Glucose

• Rubisco

• Ribulose bisphosphate (RuBP)

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The image shows a chloroplast.

During photosynthesis, what happens in the chloroplast at the location labelled lumen?

• Protons accumulate.

• Pyruvate undergoes decarboxylation.

• NADH is oxidized.

• Oxygen is produced.

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