04.3 - The Process of Photosynthesis (15pts.)

Thylakoids contain clusters of chlorophyll and proteins known as​ (a)   . They absorb sunlight and generate high-energy ​ (b)   ​ that pass along the​ (c)   .

• photosystems

• electrons

• electron transport chain

• CAM plants

Answer explanation

Thylakoids contain photosystems that absorb sunlight and generate high-energy electrons, which pass along the electron transport chain.

Tags

HS-LS1-C

HS-LS2-B

The light-independent reactions of photosynthesis are also known as ​ (a)   . During this process, energy from ATP and ​ (b)   is used to assemble high-energy ​ (c)   .

• the Calvin Cycle

• NADPH

• sugars

• stroma

Answer explanation

The light-independent reactions of photosynthesis are known as the Calvin Cycle. During this process, energy from ATP and NADPH is used to assemble high-energy sugars.

Tags

HS-LS1-C-4

Based on the Graph, When light intensity is BELOW 200 μmol photons/m²/s, ​ (a)   plants have a higher rate of photosynthesis?

• Shade

• Sun

• Photosynthesis

• CO2

Answer explanation

When light intensity is below 200 μmol photons/m²/s, shade plants have a higher rate of photosynthesis compared to sun plants.

Tags

HS-LS1-C-1

Light intensity in the Sonoran Desert averages about 400 μmol photons/m²/s.

Based on the Graph, What is the approximate rate of photosynthesis for sun plants that grow in this environment?

• 0

• 3

• 6

• 9

• 12

Answer explanation

The correct rate of photosynthesis for sun plants in this environment is 12, as indicated by the light intensity of 400 μmol photons/m^2/s on the graph.

Tags

HS-LS1-C-1

HS-LS2-B-3

HS-LS2-C-1

HS-LS2-A-1

HS-LS2

As the rate of photosynthesis increases, what do you think happens to the rate at which sugars are produced by the plant?

• As Photosynthesis increases, Sugar production also increases

• As Photosynthesis increases, Sugar production will decrease

• As Photosynthesis increases, Sugar production stays the same

Answer explanation

As Photosynthesis increases, Sugar production also increases

Tags

HS-LS1-C-1

HS-LS1-C

For both groups of plants, what BEST describes the relationship between light intensity and rate of photosynthesis?

• • The rate of photosynthesis increases with light intensity, and might be limited by other factors such as water and temperature.

• • The rate of photosynthesis increases with light intensity, and it increases without limit.

• • The rate of photosynthesis is independent of light intensity, but may be limited by other factors such as water and temperature.

• The rate of photosynthesis is at a maximum over a narrow range of light intensities.

Answer explanation

The rate of photosynthesis increases with light intensity, and might be limited by other factors such as water and temperature.

Tags

HS-LS1-C-4

Briana is studying a model of the light-dependent reactions of photosynthesis. The diagram shows a part of this model.

Briana notices the electrons that the water molecules release. She asks, "Will the electrons build up in the chloroplast?"

Which addition to the diagram would be most useful for answering Briana's question?

• • a wavy arrow that shows Photosystem I

• • an equation for the chemical reaction that forms water from hydrogen ions, electrons, and oxygen molecules

• • an arrow that shows the electrons moving through electron carriers, and received by NADP⁺

• an equation for the chemical reaction that forms hydrogen gas from hydrogen ions and electrons

Answer explanation

Adding an arrow showing the electrons moving through electron carriers and being received by NADP+ would be most useful to answer Briana's question about electron buildup in the chloroplast.

Tags

HS-LS1-C-4

During the light-independent reactions of photosynthesis, carbon dioxide is combined with hydrogen to form sugars.

What is the energy SOURCE, if any, that allows this process to occur?

• • The energy source is high-energy bonds in sugar molecules.

• • The energy source is ATP from the light-dependent reactions.

• • The energy source is ATP from processes that occur in other organelles of the cell.

• No energy source is used; the process occurs without an energy input.

Answer explanation

The energy source is ATP from the light-dependent reactions, providing the necessary energy for the light-independent reactions to occur and form sugars.

Tags

HS-LS1-C-3

When the light-independent reactions are occurring, gases diffuse between the chloroplast and the air that surrounds the plant.

Why is gas diffusion essential during this stage of photosynthesis?

• • Water vapor is used to assemble sugar molecules.

• • Carbon dioxide is used to assemble sugar molecules.

• • Molecular oxygen is used to assemble sugar molecules.

• Water vapor is released as a waste product.

Answer explanation

Gas diffusion is essential during the light-independent reactions of photosynthesis because carbon dioxide is used to assemble sugar molecules, which is a crucial step in the process.

Tags

HS-LS1-C-3

Although animals do not perform photosynthesis, their food supply depends on the sugars that photosynthesis produces.

What is the other significant benefit to animals that photosynthesis provides?

• • generating ATP and NADPH

• • removing water from the environment

• • adding carbon dioxide to the atmosphere

• adding oxygen to the atmosphere

Answer explanation

The significant benefit to animals that photosynthesis provides is adding oxygen to the atmosphere, which is essential for their respiration.

Tags

HS-LS2-B

HS-LS2-B-1