How do plants breathe? Explore how plants “breathe” through the process of photosynthesis and plant respiration. This science experiment helps kids learn how plants absorb carbon dioxide and release oxygen, providing an excellent hands-on introduction to plant science.
How Do Plants Breathe?
Grade Level: Pre-K, Kindergarten, Elementary Grades
Concepts Explored: Photosynthesis, Plant Respiration, Plant Transpiration, Plant Growth
Plants are essential to life on Earth. Through photosynthesis, plants convert sunlight into food and release oxygen, a vital resource for animals and humans. In this experiment, kids will observe how plants absorb carbon dioxide and release oxygen. This allows them to understand the process of photosynthesis and how plants breathe.
Supplies Needed
- Shallow glass bowl or container
- Fresh leaves (from a plant or tree)
- Lukewarm water (Room temperature works too)
- Small heavy object (to submerge leaves)
- Magnifying glass (optional)
🍃 Leftover leaves? Why not learn about leaf veins, try a leaf chromatography experiment or even enjoy a leaf rubbing craft!
Set Up the Plant Respiration Experiment
Collect fresh green leaves from a plant or tree. Make sure they haven’t fallen to the ground, as fresh leaves are essential for the experiment.
Fill a shallow glass bowl or container with lukewarm water.
Place a single layer of leaves into the water, ensuring they are submerged just below the surface. Use a small, heavy object to keep the leaves in place.
Set the bowl in a sunny spot and wait for about 2 to 3 hours.
After a few hours, you should begin to see tiny air bubbles form on the surface of the leaves. These bubbles are a sign of plant respiration!
How Do Plants Breathe? Plant Respiration & Photosynthesis
Photosynthesis is the process by which plants use sunlight to make their food. During this process, plants absorb carbon dioxide from the air and, through chemical reactions, convert it into glucose (a form of sugar) for energy. As a byproduct, plants release oxygen, which we depend on to breathe!
The bubbles you observe are oxygen molecules being released by the leaves during the process of photosynthesis. This is known as plant respiration, where plants “breathe” out oxygen while making their food.
As the plant leaves absorb sunlight, they begin the photosynthesis process. Oxygen is produced as a byproduct and released through tiny pores on the leaves, known as stomata. In the water, this oxygen forms bubbles that rise to the surface, allowing you to observe plant respiration in action directly!
Plant Science Facts for Kids:
- Plants are producers in the food chain. They make their own food using sunlight and provide food for herbivores, which are eaten by carnivores.
- The Carbon Cycle: Plants play a critical role in the carbon cycle by absorbing carbon dioxide during photosynthesis. They convert it into glucose, which animals and humans consume. When plants and animals die, the carbon is returned to the atmosphere through decomposition or combustion.
Turn It Into a Plant Science Project
🔎 Use the scientific method to make this a complete science project!
Question: How does sunlight affect how much oxygen a plant releases during photosynthesis?
Hypothesis: Example: “If a plant is in the sunlight, then it will release more oxygen than a plant in the shade.”
- Independent variable: Amount of sunlight (sun vs. shade)
- Dependent variable: Amount of oxygen released (bubbles in water)
- Controls: Same type of leaf, same size bowl, same water temperature, same observation time
Test and Record: Experiment with different lighting conditions and record the number of bubbles formed in each setup!
Related Plant Activities
- Plant Transpiration Experiment
- How Leaves Drink Experiment
- Playdough Plant Cell Model
- 3D Plant Cell Model Printable
- Photosynthesis Steps Printable Project
- Photosynthesis Experiment with Chlorophyll
- Plant Growth Science Experiment
- Celery Food Coloring Experiment
Printable Plant Activities Pack
Explore 20+ Plant Activities for Kids! 🌱 Looking for fun and educational plant-themed activities for K-5? This comprehensive Plant Activity Pack is ideal for early elementary school grades, offering hands-on learning experiences suitable for all skill levels. These activities are ideal for classroom and at-home learning, whether for fall or spring science lessons. Find a preschool plants pack here.
