week 5

Where do plants get their biomass?

• Soil

• Sun

• Water

• Air

The process of photosynthesis occurs where?

• thallykoid membrane

• stomata

• mesophyll layer

• chloroplast

gas exchange of carbon dioxide and oxygen occurs where?

• mesophyll layer

• stomata

• thallykoid membrane

Chloroplasts are derived from cyanobacteria

• True

• False

What type of light is best for plant growth? Hint think about why leaves appear green to the human eye.

• Green light

• Blue light

• Orange/Red light

Answer explanation

Chlorophyll absorbs wavelengths from either end of the visible spectrum (blue and orange/red), but not green. Because green isn’t absorbed it is reflected or transmitted, our eyes see the green light is reflected which is why plants lookgreen

If a plant is exposed to just orange/red light, what would happen?

• The rate of photosynthesis would increase (orange/red wavelengths have the highest energy). 

• The rate of photosynthesis would remain unchanged (plants can use any wavelength of light to photosynthesize).

• The rate of photosynthesis would decrease by more than half. 

• The rate of photosynthesis would decrease by half.

Match each statement with whether it is describing PSII

• Embedded in the thylakoid membrane

• Its donated electron is replaced with an e- from H2O

• Contain chlorophyll

• Donates an excited e- to the e-transport chain

• Donates an excited e- to NADP+ reductase

Match each statement with whether it is describing PSI

• Its donated electron is replaced by an e- from the e-transport chain

• Embedded in the thylakoid membrane

• Donates an excited e- to NADP+ reductase

• Donates an excited e- to the e-transport chain

• Its donated electron is replaced with an e- from H2O

Match each statement with whether it is describing both PSII and PSI

• Contain chlorophyll

• Embedded in the thylakoid membrane

• Its donated electron is replaced by an e- from the e-transport chain

• Absorb photons of light

• Donates an excited e- to the e-transport chain

What would happen if protons (H+) could flow freely across the thylakoid membrane?

Match each step with whether it would Stop.

• The e-transport chain donating an electron to PSI to replace the one it donated 

• ATP production

• PSI donating high energy electrons to NADP+ reductase which produces NADPH

• Build up of protons (H+) inside of the thylakoid, creation of a proton (H+) gradient across the thylakoid membrane