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The summary equation for photosynthesis is

6CO2+6H2O+sunlight --> C6H12O6+6O2

Which of the following statements regarding photosynthesis and carbon dioxide is false?

Burning wood contributes more to acid rain than burning fossil fuels

What is the name given to organisms that can make their own food and the food for the biosphere?


Autotrophs that utilize light as their energy source are


In most green plants, chloroplasts are

concentrated in a zone of leaf tissue called the mesophyll

CO2 enters and O2 escapes from a leaf via


In the chloroplast, sugars are made in a compartment that is filled with a thick fluid called the


Chloroplasts contain disklike membranous sacs arranged in stacks called


Where is chlorophyll found in a plant cell?

thylakoid membranes

The oxygen released into the air as a product of photosynthesis comes from


Which of the following statements concerning the role of redox reactions in photosynthesis and cellular respiration is true?

In photosynthesis, carbon dioxide is reduced to form sugar, while in respiration, sugar is oxidized to form carbon dioxide.

What is the source of energy that provides the boost for electrons during photosynthesis?


The light reactions occur in the ________, while the Calvin cycle occurs in the __________.

thylakoid membranes... stroma

Which of the following are produced during the light reactions of photosynthesis?


Which of the following are produced during the Calvin cycle?

glucose, ADP, NADP+

Carbon fixation

occurs when carbon and oxygen from CO2 are incorporated into an organic molecule

Sunlight is a type of _____ energy


Why are most plants green?

Chlorophyll a reflects green light.

Which of the following colors contributes the least energy to photosynthesis?


Plant cells are protected from the harmful effects of oxygen radicals with


A packet of light energy is called a


Which of the following statements about the absorption of photons by pigment molecules is true?

The release of energy by the excited electron can be as heat, light or fluorescence

Which of the following photosynthetic pigments can be found at the photosystem reaction center?

chlorophyll a

How do the reaction centers of photosystem I and II differ?

Each preferentially absorbs slightly different wavelengths of light

The energy that excites P680 and P700 is supplied by


The electron transport chains of the light reactions

shuttle electrons along in a series of redox reactions

As a result of the cascade of electrons down the electron transport chains of the light reactions,

NADP+ is reduced to NADPH.

The electrons lost from the reaction center of photosystem I are replaced by electrons from

the bottom of the electron transport chain

The electrons lost from the reaction center of photosystem II are replaced by electrons from


Photophosphorylation differs from oxidative phosphorylation in that

the final electron acceptor is NADP+ and not oxygen.

In photophosphorylation, energy from electron flow is used to transport ______ from the _______ to the thylakoid compartment, generating a concentration gradient of _____.

H+... stroma...H+

Mitochondria transfer _________ energy from ___________ to ATP; chloroplasts transform ______ energy into the chemical energy of ATP.

chemical... food... light

Photosynthetic organisms derive their carbon from

carbon dioxide

To produce one glucose, the Calvin cycle needs to be run through ______ time(s).


The Calvin cycle constructs ________, an energy-rich molecules that a plant cell can then use to make glucose or other organic molecules.


The ultimate source of all the food we eat and the oxygen we breathe is


Plants use sugars as

a fuel for cellular respiration and a starting material for making other organic molecules

Plant cells

have mitochondria and chloroplasts

The greenhouse effect is

reduced by photosynthesis, which removes carbon dioxide from the atmosphere

Which of the following statements about the greenhouse effect is true?

The greenhouse effect is exacerbated by the use of fossil fuels


protects Earth from UV radiation

Ozone consists of _______ oxygen atom(s).


Which of the following has been a major source of ozone destruction over the past 50 years?


In this drawing of a chloroplast, which structure represents the thylakoid membrane?

structure C

According to this figure, how do H+ ions make their way from the stroma to the thylakoid interior?

through an electron transport chain molecule

Based on your knowledge of the process of photosynthesis, the plant in the container placed under red light would probably

absorb more CO2 than the plants under the green light

Carbon dioxide absorption is an appropriate indicator of photosynthesis because

CO2 is needed to produce sugars in the Calvin cycle.

Refer back to numbers 48&49


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