Photosynthesis: A Quiz for Grade 7 Students

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 absorption of light energy and the conversion of that energy into chemical energy in the form of glucose.

• 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 process of light-dependent reactions in photosynthesis.

• The process of light-dependent reactions in photosynthesis involves the conversion of light energy into chemical energy in the form of ATP and NADPH.

• The process of light-dependent reactions in photosynthesis does not involve the absorption of light by chlorophyll

• Light-dependent reactions in photosynthesis occur in the stroma of the chloroplast

• The process of light-dependent reactions in photosynthesis involves the release of oxygen as a byproduct

Describe the steps involved in the Calvin cycle.

• The steps involved in the Calvin cycle are carbon fixation, reduction, and regeneration of RuBP.

• The steps involved in the Calvin cycle are mitosis, meiosis, and cytokinesis.

• The steps involved in the Calvin cycle are photosynthesis, transpiration, and respiration.

• The steps involved in the Calvin cycle are glycolysis, Krebs cycle, and electron transport chain.

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

• Nitrogen levels, cloud cover, and soil compaction

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

• Soil pH, wind speed, and humidity

• Oxygen concentration, plant height, and soil salinity

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

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

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

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

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

Why is photosynthesis important for the survival of plants and other living organisms?

• Photosynthesis is important because it produces carbon dioxide for respiration and water for hydration.

• Photosynthesis is important because it produces glucose for energy and oxygen for other living organisms.

• Photosynthesis is important because it produces nitrogen for plant growth and sunlight for warmth.

• Photosynthesis is important because it produces minerals for plant nutrition and heat for metabolism.

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

• The structure of a chloroplast contributes to photosynthesis by storing excess water for the plant.

• The structure of a chloroplast helps in absorbing carbon dioxide from the atmosphere.

• The structure of a chloroplast, particularly the thylakoid membranes, provides the surface area and organization needed for the light-dependent reactions of photosynthesis to take place.

• The structure of a chloroplast contributes to photosynthesis by regulating the plant's temperature.

What role do light and pigments play in the light-dependent reactions of photosynthesis?

• Light is absorbed by pigments such as chlorophyll, which then transfer the energy to the reaction center of photosystems to drive the light-dependent reactions.

• Pigments absorb light but do not transfer the energy to drive the reactions

• Light and pigments have no role in the light-dependent reactions of photosynthesis

• Pigments reflect light instead of absorbing it, hindering the light-dependent reactions

Explain how carbon dioxide concentration and temperature can impact the rate of photosynthesis.

• Both an increase in carbon dioxide concentration and temperature can initially increase the rate of photosynthesis, but excessive levels of either can have diminishing or negative effects on the process.

• A decrease in carbon dioxide concentration will increase the rate of photosynthesis

• A decrease in temperature will increase the rate of photosynthesis

• An increase in carbon dioxide concentration will decrease the rate of photosynthesis

Discuss the significance of photosynthesis in the production of oxygen and food for living organisms.

• Other processes are more important than photosynthesis in the production of oxygen and food for living organisms

• Photosynthesis is significant in the production of oxygen and food for living organisms because it is the primary process by which oxygen is released into the atmosphere and provides the basis for the food chain.

• Photosynthesis has no significance in the production of oxygen and food for living organisms

• The significance of photosynthesis in the production of oxygen and food for living organisms is overrated