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This is the pre-test!

Which of the following organisms makes its own food using light energy from the sun?


Which of the following organisms is a heterotroph?


What happens during photosynthesis?

Autotrophs produce carbohydrates.

Plants gather energy with light-absorbing molecules called


Plants get the energy they need for photosynthesis by absorbing


Most plants appear green because chlorophyll

does not absorb green light.

A granum is a

stack of thylakoids.

The stroma is the region outside the


Where in the chloroplast is chlorophyll found?

In the thylakoid membrane.

Which of the following is NOT a part of an ATP molecule?


What happens when chlorophyll is struck by sunlight?

The electrons in chlorophyll molecule become energized.

What is the role of NADP+ in photosynthesis?

Electron carrier.

What makes certain molecules good electron carriers?

They can accept electrons and transfer most of their energy to another molecule.

Why are electron carriers needed for transporting electrons from one part of the chloroplast to another?

High-energy electrons are highly reactive.

A student is collecting the gas given off from a plant in bright sunlight at a temperature of 27°C. The gas being collected is probably


Photosynthesis uses sunlight to convert water and carbon dioxide into

oxygen and high-energy sugars.

Which of the following is NOT found in the overall reaction for photosynthesis?


In the overall equation for photosynthesis, six molecules of carbon dioxide and six molecules of water result in a molecule of sugar and six molecules of


Energy is released from ATP when

a phosphate group is removed.

Where do the light-dependent reactions take place?

Within the thylakoid membranes

What are the products of the light-dependent reactions?

ATP, NADPH, and oxygen gas

Which of the following is NOT a step in the light-dependent reactions?

ATP and NADPH are used to produce high-energy sugars.

What action contributes to the inside of the thylakoid membrane becoming positively charged during the light-dependent reactions?

H+ ions are released as water splits.

Where are photosystems I and II found?

In the thylakoid membrane.

Which of the following activities happens within the stroma?

The Calvin cycle produces sugars.

Which pathway represents the flow of electrons during photosynthesis?

H2O ® NADP+ ® Calvin cycle.

The Calvin cycle is another name for the

light-independent reactions.

The Calvin cycle takes place in the


What is a product of the Calvin cycle?

High-energy sugars.

Which of the following is NOT a true statement about ATP?

Used ATP is discarded by the cell as waste.

How does the Calvin cycle differ from the light-dependent reactions?

It takes place in the stroma.

If carbon dioxide is completely removed from a plant's environment, what would you expect to happen to the plant's production of high-energy sugars?

No sugars will be produced.

If you continue to increase the intensity of light that a plant receives, what happens?

The rate of photosynthesis increases and then levels off.

Organisms, such as plants, that make their own food are called


Organisms that cannot make their own food and must obtain energy from external sources are called


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