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Which graph represents the action spectrum for a green plant receiving only blue light?

• Graph A

• Graph B

• Graph C

• Graph D

Answer explanation

Graph B represents the action spectrum for a green plant receiving only blue light because it shows the highest rate of photosynthesis under blue light, indicating the peak absorption of blue light by the plant.

What is the action spectrum of photosynthesis?

• The range of wavelengths of light within which photosynthesis is most efficient.

• The range of wavelengths of light that are absorbed by chlorophyll.

• The range of wavelengths of light that are reflected by plant leaves.

• The range of wavelengths of light that are transmitted through plant leaves.

Which is/are likely to be the independent variable(s) in this investigation?

• A. Temperature

• B. Light intensity

• C. Concentration of sodium hydrogen carbonate

• D. Volume of Oxygen

Compare AND/OR contrast the processes of photosynthesis and respiration for specific factors.

• Photosynthesis occurs in chloroplasts, while respiration occurs in mitochondria.

• Photosynthesis occurs in mitochondria, while respiration occurs in chloroplasts.

• Both photosynthesis and respiration occur in the nucleus.

• Both photosynthesis and respiration occur in the cytoplasm.

Which of the following is a similarity between photosynthesis and respiration?

• Both processes occur in the chloroplast.

• Both use excited electrons transferred between carriers on membranes.

• Both generate oxygen as a byproduct.

• Both processes occur in the mitochondrion.

In photosynthesis, where is solar energy converted to chemical energy?

• In the mitochondrion.

• In the stroma site of light-independent reaction.

• In the matrix site of glycolysis.

• In the cytoplasm.

Why does the action spectrum of photosynthesis have peaks in the blue and red regions of the light spectrum?

• Because chlorophyll absorbs light most efficiently in these regions.

• Because these regions have the highest light intensity.

• Because these regions have the longest wavelengths.

• Because these regions are least absorbed by water.

What is the final electron acceptor in the electron transport chain (ETC) during respiration?

• NADP

• FAD

• Oxygen (O₂)

• Water (H₂O)

Which pigment is primarily responsible for the peaks in the action spectrum of photosynthesis?

• Carotenoids

• Chlorophyll a

• Chlorophyll b

• Xanthophylls

What is the main purpose of the Calvin cycle in photosynthesis?

• To produce ATP

• To fix carbon dioxide into organic molecules

• To release oxygen

• To absorb light energy