Photosynthesis

How does temperature affect photosynthesis?

• Increases the rate at which enzymes work
• Gives the plant energy to perform photosynthesis
• Stops certain enzymes that interfere with photosynthesis working

When it is chilly and raining outside, there is no photosynthesis taking place. What is the limiting factor?

• Temperature
• Rainfall
• Carbon Dioxide

Tags

NGSS.MS-LS1-6

What is a limiting factor?

• The factor which increases the rate of a reaction
• The factor that limits the reaction rate
• The factor that limits the rate at which an enzyme is destroyed

Tags

NGSS.HS-PS1-5

Which lettered graph represents the affect of light intensity on photosynthetic rate?

• A

• B

• C

• D

Tags

NGSS.MS-LS1-6

Which lettered graph represents the effect of temperature on photosynthetic rate?

• A

• B

• C

• D

Tags

NGSS.MS-LS1-6

What do the light reactions produce?

• ATP, NADPH, O₂
• H₂O, O₂, Glucose
• NADP⁺, ADP + P, O₂
• NADPH, H₂O, ATP

Where do the light reactions take place inside a chloroplast?

• stroma
• lamellae
• chloroplast membrane
• thylakoid membrane

A flask containing photosynthetic green algae and a control flask containing water with no algae are both placed under a bank of lights, which are set to cycle between 12 hours of light and 12 hours of dark. The dissolved oxygen concentrations in both flasks are monitored. Predict what the relative dissolved oxygen concentrations will be in the flask with algae compared to the control flask.

• The dissolved oxygen in the flask with algae will be higher in the light, but the same in the dark.

• The dissolved oxygen in the flask with algae will be higher in the light, but lower in the dark.

• The dissolved oxygen in the flask with algae will always be higher.

• The dissolved oxygen in the flask with algae will always be lower.

If the carbon atom of each of the incoming CO₂ molecules is labeled with a radioactive isotope of carbon, which organic molecules will be radioactively labeled after one cycle?

• C only

• B, C, D and E

• C, D and E

• B and C only

What begins the process of photosynthesis?

• carbon dioxide is diffused into the stroma to, in a series of reactions, create sugar

• Water is split apart to release electrons and create a hydrogen concentration gradient

• ATP and NADPH energize reactants to produce oxygen and glucose

• Light energy is absorbed by pigments to energize the electron transport chain