Savvas Biology Test: Photosynthesis

The diagram shows the structure of adenosine diphosphate (ADP). What describes the conversion of ADP to ATP?

an input of energy to attach a third phosphate group

Stuart is listing the changes to matter and energy that occur during the process of photosynthesis. Which of these examples should he include in his list?

changes that convert light energy into chemical energy stored in carbohydrates

Nancy is explaining why chlorophyll is classified as a plant pigment and how it is useful in photosynthesis. Which property of chlorophyll would be most appropriate for her to cite?

chlorophyll's ability to absorb light

Yasmine is asked to describe the structural organization of chloroplasts. She writes the following sentence:

"A chloroplast contains thylakoid stacks, called stroma, that are surrounded by fluid-filled grana."

Which change to the sentence is necessary to make the sentence accurate?

Exchange the positions of "stroma" and "grana."

Xavier is describing the role of electron carriers, such as NADP+, in photosynthesis. Which property of NADP+ should Xavier cite?

its ability to accept and release high-energy electrons and a hydrogen ion

What BEST describes the role of light in the overall process of photosynthesis?

Light provides the energy for assembling small molecules into sugars.

The overall chemical equation that describes photosynthesis is shown below.

6CO2 + 6H2O → C6H12O6 + 6O2

By analyzing this equation, which property of photosynthesis can be identified?

the source of carbon atoms in the carbohydrate product

The overall chemical equation that describes photosynthesis is shown below. 6CO2 + 6H2O → C6H12O6 + 6O2

During photosynthesis, what best describes the role of the compound with the chemical formula C6H12O6?

a product that is useful because of its high-energy chemical bonds

Which is the role of the electron transport chain in the process of photosynthesis?

carrying electrons from photosystem II, to photosystem I, to NADP+

What BEST describes the roles of photosystem I and photosystem II in the process of photosynthesis?

They absorb sunlight and transfer the energy to electrons.

During the light-dependent reactions of photosynthesis, which event must occur for ATP synthase to function properly?

Hydrogen ions must pass through a channel within ATP synthase.

Daniel is developing a model of the light-independent reactions of photosynthesis, also known as the Calvin cycle. How should the model show how carbon compounds enter and exit the cycle?

enter as carbon dioxide, exit as 3-carbon molecules

William is developing the model shown below to illustrate the process of photosynthesis. He plans to use the model to explain how photosynthesis transforms both energy and matter. In a key or legend for the model, how should William describe the roles of NADPH and ATP in the light-independent reactions?

supplying the energy necessary to assemble sugar molecules

William is developing the model shown below to illustrate the process of photosynthesis. He plans to use the model to explain how photosynthesis transforms both energy and matter. To revise the model, William wants to use color to identify the reactants of photosynthesis. Which labels should he color? Select all that apply.

Click on the H2O and CO2 boxes

William is developing the model shown below to illustrate the process of photosynthesis. He plans to use the model to explain how photosynthesis transforms both energy and matter. The model includes a wavy arrow to show light striking the thylakoids. Which label for the wavy arrow would be MOST USEFUL for communicating the role of light in photosynthesis?

Light is the energy source for converting ADP to ATP, and NADP+ to NADPH.

William is developing the model shown below to illustrate the process of photosynthesis. He plans to use the model to explain how photosynthesis transforms both energy and matter. Earth systems include the biosphere, atmosphere, and geosphere. Use the model to explain how photosynthesis acts to transfer carbon between two Earth systems.

In both photosystem I and photosystem II, light energy is used to excite electrons. The two photosystems were named in the order of their discovery, and not in the order of their work in the light-dependent reactions. Photosystem II comes first in the sequence of events that moves electrons from water molecules to their destination, NADP+. Hydrogen ions travel with the electrons, and they combine with NADP+ to form NADPH. The process is summarized in this diagram.In the diagram, an arrow leads from the splitting of water, to the two photosystems, and then to NADP+. What process is represented by this arrow?

the movement of electrons along the electron transport chain

In both photosystem I and photosystem II, light energy is used to excite electrons. To the confusion of many students, the two photosystems were named in the order of their discovery, and not in the order of their work in the light-dependent reactions. Photosystem II comes first in the sequence of events that moves electrons from water molecules to their destination, NADP+. Hydrogen ions travel with the electrons, and they change NADP+ into NADPH. The process is summarized in this diagram.How is the production of NADPH useful for the process of photosynthesis?

A research scientist designs an experiment to measure the inputs and outputs of photosynthesis, by mass, for a representative plant over a certain time. The scientist's predictions for the results are shown in the table. If the scientist's predictions are shown to be accurate, then which conclusion about photosynthesis do they support? (HINT: Apply scientific principles such as the Law of Conservation of Mass.)

Some but not all of the matter in carbon dioxide is converted into sugars.

A research scientist designs an experiment to measure the inputs and outputs of photosynthesis, by mass, for a representative plant over a certain time. The scientist's predictions for the results are shown in the table. Drag and drop the words to complete the sentences that describe the inputs and outputs of photosynthesis.

The role of water molecules is to produce

ELECTRONS and hydrogen ions during the

LIGHT-DEPENDENT REACTIONS. The role of

CARBON DIOXIDE is to provide the matter for

SUGARS, which is the main output of photosynthesis.

Under normal conditions, gases diffuse through small holes in the leaves of a plant. When the weather is very hot and dry, plants may close these openings to conserve water. How are the closures most likely to affect photosynthesis?

They decrease the rate of photosynthesis by preventing carbon dioxide from entering the leaf.

A research scientist designs an experiment to measure the inputs and outputs of photosynthesis, by mass, for a representative plant over a certain time. The scientist's predictions for the results are shown in the table. The table that the scientist constructed does not include light. Describe the role of light in the scientist's experiment. Then propose an explanation for why light was not included in the table.

Plants depend on a wide variety of carbon compounds, including carbohydrates, lipids, and proteins. What BEST describes the role of photosynthesis in producing these compounds?

Photosynthesis produces 3-carbon molecules that can be converted into other compounds.

Researchers have been developing an artificial leaf, a device that mimics the actions of photosynthesis. The artificial leaf harnesses the energy of sunlight and uses it to provide energy for a series of chemical reactions. Potential products include hydrogen gas (H2) and methane gas (CH4). What is one way that the chemical processes of the artificial leaf are similar to photosynthesis?

The products contain high-energy chemical bonds.