Unit 1 B Study Guide

The graph shows the rates of photosynthesis and cellular respiration of a plant during daylight hours. What can be concluded from the graph?

• A. The rate of photosynthesis is higher at dawn than at dusk.

• B. The rate of cellular respiration is higher at dusk than at dawn.

• C. The rate of photosynthesis is dependent on the amount of direct sunlight available.

An incomplete equation for photosynthesis is given. 6X + 6H₂O + light energy → Y + 6O₂ Which table correctly identifies the missing compounds, X and Y, and their chemical formulas?

• X: carbon dioxide (CO₂), Y: hydrogen (H₂)

• X: glucose (C₆H₁₂O₆), Y: hydrogen (H₂)

• X: glucose (C₆H₁₂O₆), Y: carbon dioxide (CO₂)

• X: carbon dioxide (CO₂), Y: glucose (C₆H₁₂O₆)

What is represented by the letters P and Q in the diagram?

• Both P and Q represent light-dependent reactions.

• Both P and Q represent light-independent reactions.

• P represents the light-dependent reactions, and Q represents the light-independent reactions.

• P represents the light-independent reactions, and Q represents the light-dependent reactions.

The diagram represents the energy conversion that occurs during photosynthesis. Which terms best complete the diagram at the points labeled 1 and 2?

• 1: chemical energy; 2: chemical energy

• 1: light energy; 2: light energy

• 1: chemical energy; 2: light energy

• 1: light energy; 2: chemical energy

According to the data, what happened to the plant’s rate of photosynthesis and the resulting impact on oxygen production as the distance from the light source decreased?

• The rates of photosynthesis and oxygen production increased.

• The rate of photosynthesis decreased, and the rate of oxygen production increased.

• The rates of photosynthesis and oxygen production decreased.

• The rate of photosynthesis increased, and the rate of oxygen production decreased.

Chlorophyll captures energy from sunlight during photosynthesis. Energy is captured from all of the colors of visible light except one. Which color of light is not captured?

• blue

• violet

• green

• red

During the light-dependent reactions of photosynthesis, solar energy splits water molecules, which results in the release of a waste product. Which molecule is released as a waste product?

• glucose

• hydrogen

• oxygen

• starch

The graph shows the amount of oxygen absorbed and released by a plant during one day. At which point during the day was the rate of photosynthesis the highest?

• A) P

• B) Q

• C) R

• D) S

Which option best describes how the transformation occurs?

• A. Light energy converts to sugars through intermediates, such as H2O, CO2, and O2.

• B. Light energy converts to sugars through intermediates, such as ATP and NADPH.

• C. Light energy converts directly to sugars during the light-dependent reactions.

• D. Light energy converts directly to sugars during the Calvin cycle.

Which conclusion can be defended based upon this data?

• A. Photosynthesis in pondweed is at its highest rate of productivity at 30°C.

• B. Photosynthesis in pondweed is at its highest rate of productivity at 40°C.

• C. The rate of photosynthesis increases as the temperature increases.

• D. The rate of photosynthesis decreases as the temperature increases.