Photosynthesis: A Quiz for Grade 11 Students

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

• ATP and NADPH

• Glucose and Oxygen

• Carbon Dioxide and Water

• Starch and Sucrose

Explain the role of chlorophyll in the light-dependent reactions.

• Chlorophyll absorbs heat energy instead of light energy

• Chlorophyll is only involved in the dark reactions of photosynthesis

• Chlorophyll plays a key role in capturing light energy and converting it into chemical energy in the form of ATP and NADPH.

• Chlorophyll has no role in the light-dependent reactions

What is the primary function of the Calvin cycle in photosynthesis?

• To break down chlorophyll molecules

• To produce glucose from carbon dioxide

• To produce oxygen from water

• To convert glucose into carbon dioxide

Describe the three main stages of the Calvin cycle.

• Carbon fixation, reduction, and regeneration of RuBP

• Oxidation, phosphorylation, and glycolysis

• Cell division, DNA replication, and protein synthesis

• Photosynthesis, respiration, and transpiration

What is the structure of a chloroplast and how does it relate to photosynthesis?

• The structure of a chloroplast is specifically adapted for the process of photosynthesis, with the thylakoid membranes and chlorophyll allowing for the capture and conversion of light energy into chemical energy.

• Chloroplasts have no specific structure for photosynthesis

• Chlorophyll is not involved in the structure of a chloroplast

• The structure of a chloroplast is not related to photosynthesis

Explain the role of thylakoid membranes in the light-dependent reactions.

• Thylakoid membranes are responsible for storing excess water during the light-dependent reactions.

• Thylakoid membranes play a crucial role in capturing light energy and converting it into chemical energy during the light-dependent reactions of photosynthesis.

• Thylakoid membranes aid in the breakdown of glucose to release energy during the light-dependent reactions.

• Thylakoid membranes help regulate the temperature of the plant during the light-dependent reactions.

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

• 6CO2 + 6H2O + light energy → C6H12O6 + 3O2

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

• 6CO2 + 6H2O + light energy → C12H24O12 + 6O2

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

How does the process of photosynthesis contribute to the oxygen levels in the atmosphere?

• Photosynthesis produces oxygen as a byproduct, increasing the oxygen levels in the atmosphere.

• Photosynthesis releases carbon dioxide, not oxygen, into the atmosphere.

• Photosynthesis has no impact on the oxygen levels in the atmosphere.

• Photosynthesis consumes oxygen, decreasing the oxygen levels in the atmosphere.

What are the factors that can affect the rate of photosynthesis?

• Oxygen concentration, plant height, and leaf color

• Soil pH, wind speed, and humidity

• Light intensity, carbon dioxide concentration, temperature, and water availability

• Nitrogen levels, cloud cover, and soil compaction

Explain the concept of photorespiration and its impact on photosynthesis.

• Photorespiration increases the efficiency of photosynthesis by utilizing excess energy and resources.

• Photorespiration only occurs in C4 plants under low temperature and oxygen levels.

• Photorespiration has no impact on photosynthesis and is only a minor process in plant metabolism.

• Photorespiration reduces the efficiency of photosynthesis by wasting energy and resources, and it occurs in C3 plants under high temperature and oxygen levels.