Photosynthesis Chapter 7

Which of the following equations represents photosynthesis?

6CO2 + 6H2O → C6H12O6 + 6O2

What properly summarizes the inputs and outputs of the Calvin cycle?

ATP + NADPH + 3CO 2 → G3P

What two molecules are produced by the light reactions and used to power the Calvin cycle?

ATP and NADPH

What connects the two photosystems in the light reactions?

An electron transport chain

What provides the carbon atoms that are incorporated into sugar molecules in the Calvin cycle?

CO2

In what organelle does photosynthesis take place?

Chloroplast

Incoming photons of light energy initiate photosynthesis by

Exciting electrons in pigment molecules within the photosystems, raising them to a higher energy level

The end products of photosynthesis are

Glucose and molecular oxygen

What provides electrons for the light reactions?

H2O

What are some of the benefits of photosynthesis?

It is an oxygen source as well as a source of stored energy

The thylakoid membranes bring together the components necessary to carry out the

Light reactions

The overall function of the Calvin cycle is

Making sugar

What transports electrons from the light reactions to the Calvin cycle?

NADPH

One of the important waste products of photosynthesis is oxygen gas. Where does this oxygen gas come from?

Oxygen is released when water is broken down to extract electrons and protons for use in the light reactions.

The light reactions produce

Oxygen, NADPH, and ATP

When light strikes chlorophyll molecules, they lose electrons, which are ultimately replaced by other electrons obtained by

Splitting water

The Calvin cycle takes place in the

Stroma

The ultimate energy source that supports most life on Earth is

Sunlight

The light reactions take place in the

Thylakoids

Which of the following is a good reason for using fast-growing trees as fuel?

Vigorously growing plants remove a lot of carbon dioxide from the air