Photosynthesis as an Endothermic Process Flashcards

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What is an endothermic reaction?

An endothermic reaction is a reaction that takes in energy from its surroundings.

What is an exothermic reaction?

An exothermic reaction is a reaction that gives out energy to its surroundings.

Is photosynthesis an endothermic or an exothermic reaction?

Photosynthesis is an endothermic reaction because it takes in energy.

What is the main source of energy for photosynthesis?

The main source of energy for photosynthesis is light energy from the Sun, or from lamps in a lab.

Which substance in plant cells absorbs light energy for photosynthesis?

Chlorophyll in the chloroplasts absorbs light energy for photosynthesis.

How is energy transferred from the environment to the plant in photosynthesis?

Light energy from the surroundings is absorbed by chlorophyll and transferred to the chloroplasts.

Why does photosynthesis need to take in energy?

Photosynthesis needs energy to build glucose molecules from carbon dioxide and water, which are smaller, low-energy molecules.

In photosynthesis, where is the absorbed energy stored?

The absorbed energy is stored in the chemical bonds of the glucose molecules made by the plant.

In terms of bonds, why is photosynthesis endothermic?

More energy is needed to break bonds in carbon dioxide and water than is released when new bonds form in glucose and oxygen, so energy must be taken in.

How does photosynthesis differ from respiration in energy transfer?

Photosynthesis takes in and stores energy in glucose, while respiration releases energy from glucose.