Photosynthesis and Cellular Respiration: Reactants and Products

What are the reactants of photosynthesis?

• Carbon dioxide and water

• Glucose and oxygen

• ATP and sunlight

• Carbon dioxide and ATP

Where does cellular respiration occur in cells?

• Chloroplasts

• Mitochondria

• Nucleus

• Ribosomes

What is the main product of cellular respiration that provides energy for cellular functions?

• Glucose

• ATP

• Oxygen

• Carbon dioxide

How are photosynthesis and cellular respiration interconnected?

• They both produce glucose as a product.

• The products of one process serve as reactants for the other.

• They both occur in chloroplasts.

• They both release oxygen into the atmosphere.

What role does photosynthesis play in the carbon cycle?

• It releases carbon dioxide into the atmosphere.

• It removes carbon dioxide from the atmosphere.

• It converts ATP into glucose.

• It breaks down glucose into carbon dioxide.

Which statement best explains why photosynthesis and cellular respiration depend on each other?

• Photosynthesis and cellular respiration are unrelated processes that do not affect each other.
• Photosynthesis produces the glucose and oxygen needed for cellular respiration, and cellular respiration produces the carbon dioxide and water needed for photosynthesis.
• Photosynthesis generates energy directly for cellular respiration, which does not require any inputs.
• Photosynthesis consumes carbon dioxide and releases glucose, while cellular respiration uses glucose to produce oxygen.

A plant is placed in a dark room for several days. Which process will be most directly affected and why?

• Photosynthesis
• Germination
• Transpiration
• Respiration

If the level of carbon dioxide in the atmosphere increased significantly, what would MOST likely happen in plants?

• Plants would likely wilt due to reduced water absorption.
• Plants would experience stunted growth from increased heat.
• Plants would likely experience increased growth due to enhanced photosynthesis.
• Plants would suffer from nutrient depletion in the soil.

A scientist places two plants in different environments.

• Plant A is placed in bright sunlight with plenty of water.

• Plant B is placed in a room with very dim light.

After one week, Plant A has produced more glucose and oxygen than Plant B.

Using your knowledge of photosynthesis and cellular respiration, explain WHY this difference occurs. In your answer include:

• How light affects the rate of photosynthesis

• How that changes the amount of glucose available for cellular respiration

• How this impacts the plant’s overall energy

Sentence Starters

• Plant A produces more glucose because…

• Photosynthesis needs light in order to…

• When a plant is in bright light, photosynthesis…

• When a plant is in dim light, photosynthesis…

A student claims:

“Cellular respiration cannot happen without photosynthesis.”

Use evidence from both processes to SUPPORT or REFUTE the student’s claim.

In your answer include:

• The reactants and products of both processes

• How the two processes are connected in the carbon cycle

• Whether cellular respiration could continue temporarily without photosynthesis

Sentence Starters:

• The student is (correct/incorrect) because…

  • Photosynthesis uses the reactants…

  • The products of photosynthesis are…

  • Cellular respiration needs…