Photosynthesis: A Quiz for Grade 10 Students

What are the two main products of the light-dependent reactions in photosynthesis?

• Starch and Sucrose

• Carbon Dioxide and Water

• ATP and NADPH

• Glucose and Oxygen

Describe the structure of a chloroplast and its role in photosynthesis.

• The chloroplast is a double-membrane organelle containing chlorophyll, responsible for capturing heat energy and converting it into chemical energy during photosynthesis.

• The chloroplast is a single-membrane organelle responsible for breaking down glucose in photosynthesis.

• The chloroplast is a triple-membrane organelle containing hemoglobin, responsible for capturing light energy and converting it into chemical energy during photosynthesis.

• The chloroplast is a double-membrane organelle containing chlorophyll, responsible for capturing light energy and converting it into chemical energy during photosynthesis.

Explain how temperature, light intensity, and carbon dioxide concentration can affect the rate of photosynthesis.

• All three factors can either increase or decrease the rate of photosynthesis, depending on their levels.

• Carbon dioxide concentration has no effect on the rate of photosynthesis

• Temperature has no effect on the rate of photosynthesis

• Light intensity has no effect on the rate of photosynthesis

Write the chemical equation for photosynthesis and explain what each component represents.

• 6CO2 + 6H2O + light energy → C6H12O6 + 6CO2

• 6CO2 + 6H2O + light energy → C6H12O6 + 6O2

• 6CO2 + 6H2O + light energy → C6H12O6 + 6H2O

• 6CO2 + 6H2O + heat energy → C6H12O6 + 6O2

What is the role of chlorophyll in the process of photosynthesis?

• Reflects light energy and inhibits the process of photosynthesis

• Stores excess water and nutrients for the plant

• Regulates the temperature of the plant during photosynthesis

• Absorbs light energy and converts it into chemical energy

How does the structure of a leaf contribute to its function in photosynthesis?

• It has a small surface area and lacks chloroplasts for inefficient absorption of sunlight and exchange of gases.

• It has a thin structure and lacks chloroplasts for efficient absorption of sunlight and exchange of gases.

• It has a rough surface and contains no chloroplasts for efficient absorption of sunlight and exchange of gases.

• It has a large surface area and contains chloroplasts for efficient absorption of sunlight and exchange of gases.

What is the significance of ATP and NADPH in the light-dependent reactions of photosynthesis?

• They provide the color needed for the reactions.

• They provide the energy and reducing power needed for the reactions.

• They regulate the temperature of the reactions.

• They control the pH level of the reactions.

Discuss the role of the Calvin cycle in the process of photosynthesis.

• The Calvin cycle is responsible for converting nitrogen into glucose using ATP and NADPH.

• The Calvin cycle is responsible for converting water into glucose using ATP and NADPH.

• The Calvin cycle is responsible for converting oxygen into glucose using ATP and NADPH.

• The Calvin cycle is responsible for converting carbon dioxide into glucose using ATP and NADPH.

Explain the concept of photorespiration and its impact on photosynthetic efficiency.

• Photorespiration is a process that only occurs in animals, not in plants.

• Photorespiration has no impact on photosynthetic efficiency.

• Photorespiration increases the efficiency of photosynthesis by consuming energy and releasing oxygen.

• Photorespiration reduces the efficiency of photosynthesis by consuming energy and releasing carbon dioxide.

How do C4 and CAM plants adapt to reduce the impact of photorespiration and increase photosynthetic efficiency?

• They increase the temperature to speed up photosynthesis

• They reduce the amount of sunlight to decrease photorespiration

• They concentrate CO2 in specialized cells to increase the efficiency of the enzyme Rubisco.

• They absorb more water to reduce photorespiration