🌿 Plant Respiration
How plants break down sugar to power every cell — day and night!
🔬 What Is Plant Respiration?
You already know that plants make their own food (glucose) through photosynthesis. But how do plants actually use that food? That's where respiration comes in!
Definition: Plant respiration is the process by which plants break down glucose (sugar) using oxygen to release energy, carbon dioxide, and water. The energy produced is in the form of ATP (adenosine triphosphate), which powers all of the plant's life activities — growing, repairing cells, absorbing nutrients, and more.
This process takes place in the mitochondria of every living plant cell — from the tips of the roots deep underground to the highest leaf on a tree.
📝 The Respiration Equation
Glucose + Oxygen → Carbon Dioxide + Water + Energy (ATP)
$$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Energy (ATP)}$$
⚠️ Important Distinction: Breathing and cellular respiration are NOT the same thing! Breathing is the physical process of inhaling and exhaling air (like you do with your lungs). Cellular respiration is a chemical reaction inside cells where oxygen is used to break down glucose and create energy.