Biology Topic Practice

Photosynthesis: Energy Transfer

Photosynthesis is an endothermic reaction in which energy is transferred from the environment to the chloroplasts by light.

Is photosynthesis an exothermic or endothermic reaction?

What is Photosynthesis: Energy Transfer?

"Photosynthesis is the process by which plants convert light energy into chemical energy stored in glucose."

Question 1

Which word equation correctly represents photosynthesis?

Question 2

On a very hot, bright day, the rate of photosynthesis might actually slow down. Why?

Question 3

Select which change would usually increase the rate of photosynthesis if light intensity is the limiting factor?

Question 4

In which part of a plant cell does photosynthesis take place?

The Photosynthesis Reaction

Chlorophyll: Absorbs light energy to drive the chemical reaction.

Endothermic: Absorbs energy from the surroundings (light).

Equation: Carbon dioxide + water $\xrightarrow{light}$ glucose + oxygen.

Site: Occurs primarily in the palisade cells of the leaf.

Exam Tip

Remember the balanced chemical equation: $6CO_2 + 6H_2O ightarrow C_6H_{12}O_6 + 6O_2$.

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