2025 Wk 30 Spaced Practice

During photosynthesis, plants convert carbon dioxide and water into glucose and oxygen. Which of the following equations correctly represents this process?

• 6CO2​+6H2​O→C6​H12​O6​+6O2​
  

• 6CO2​+C6​H12​O6​→6O2​+6H2​O

• C6​H12​O6​+6O2​→6CO2​+6H2​O

• 6H2​O+6O2​→C6​H12​O6​+6CO2​
  

Answer explanation

The correct equation for photosynthesis is 6CO2 + 6H2O → C6H12O6 + 6O2, which shows that carbon dioxide and water are converted into glucose and oxygen, accurately representing the process.

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A group of students is planning an experiment to understand the role of sunlight in photosynthesis. They decide to place one plant in sunlight and another in a dark room. After a week, they observe that the plant in the dark room has grown less compared to the one in sunlight. What is the most likely reason for this observation?

• The plant in the sunlight was able to perform photosynthesis and produce food.

• The plant in the sunlight had better soil quality.

• The plant in the dark room received more carbon dioxide.

• The plant in the dark room used up its stored nutrients faster.

Answer explanation

The plant in sunlight performed photosynthesis, converting light energy into chemical energy to produce food, which is essential for growth. In contrast, the plant in the dark could not photosynthesize, leading to less growth.

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What three things are needed for photosynthesis? (pick ALL correct answers)

• Water

• Carbon Dioxide

• Sunlight

• Oxygen

• Glucose

Answer explanation

Photosynthesis requires water, carbon dioxide, and sunlight. Water and carbon dioxide are the raw materials, while sunlight provides the energy needed for the process. Oxygen and glucose are products, not requirements.

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Plants and animals both use the process of _____ to release stored energy.

• photosynthesis

• growth

• chemical reaction

• cellular respiration

Answer explanation

Plants and animals use cellular respiration to convert stored energy into usable energy. This process involves breaking down glucose in the presence of oxygen, releasing energy for cellular activities.

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What is the main purpose of cellular respiration in living organisms?

• To break down food and release energy

• To help the body grow taller

• To carry oxygen through the bloodstream

• To make food from sunlight

Answer explanation

The main purpose of cellular respiration is to break down food and release energy, which is essential for all cellular activities and overall functioning of living organisms.

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