Is Photosynthesis Endothermic or Exothermic? Explanation

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Photosynthesis is an endothermic process, meaning it requires an input of energy to occur.

Here is the Explanation in detail.👇

Plants, the silent powerhouses of our planet, harness the sun’s energy through a spellbinding process called photosynthesis. But is this process, where sunlight transforms into delicious sugars, one that releases or absorbs energy?

Let’s delve into the world of endothermic and exothermic reactions to find out!

Endothermic vs. Exothermic

Imagine a chemical reaction like a party. In endothermic reactions, the celebrations (reactants) need an energy boost to get things going. This energy, often in the form of heat or light, is absorbed during the reaction. Think of boiling water – it takes heat to transition from a calm liquid to a bubbly mess.

On the other hand, exothermic reactions are the energetic bunch. They release energy, like celebrants dancing and letting loose. Burning wood is a classic example – the chemical bonds break down, releasing heat and light as the party rages on.

So, where does photosynthesis fit in?

Photosynthesis is an endothermic reaction! Plants soak up the sun’s energy (photons) like thirsty sponges. This light energy gets absorbed by chlorophyll, the green pigment in leaves, and is used to fuel the conversion of carbon dioxide and water into glucose (sugar) and oxygen. It’s like the plants are using sunlight to build delicious snacks for themselves!

Here’s a quick breakdown:

  • Reactants: Carbon dioxide, water, and sunlight (energy)
  • Products: Glucose (sugar) and oxygen
  • Energy change: Absorbs energy (endothermic)


  • Endothermic reactions take in energy, like photosynthesis using sunlight.
  • Exothermic reactions release energy, like burning wood releasing heat.

I hope this explanation helps you understand why photosynthesis is an endothermic reaction! Remember, the sun’s energy fuels not only plants but also the entire food chain, making photosynthesis a crucial process for life on Earth. So, the next time you bite into a juicy apple, take a moment to appreciate the endothermic magic that brought it to your plate!

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