Explain why the chlorophylls in light-harvesting complexes must absorb light of shorter wavelength than the light that would directly excite the special pair of PSI or PSII.

Explain the expected relationship between the absorption spectra of plant pigments and O2 production, electron transport, and CO2 fixation under various wavelengths of light.

List three ways in which the structure of chlorophyll differs from that of heme

Describe the step by step process of the light reactions

In cyclic photophosphorylation, it is estimated that two electrons must be passed through the cycle to pump enough protons to gener- ate one ATP. Assuming that the AG for hydrolysis of ATP under con- ditions existing in the chloroplast is about –50 kJ/mol, what is the corresponding percent efficiency of cyclic photophosphorylation, using light of 700 nm?

How can the physical properties of chlorophyll be used in measuring primary productivity in ecosystems? Hint: Can chlorophyll’s near infrared reflection be captured by special cameras?

How is the photic energy absorbed by chlorophyll transfered to ATP molecules in photophosphorylation? How will be the resulting ATP used?

What is the advantage to plants to have the option of both cyclic and noncyclic pathways for photophosphorylation?

How would you expect the rate of transpiration to be affected by the following and why?: b. The sun rising over a CAM plant.

What percentage of photosyntheticallyactive radiation is captured by plants?