Photosynthesis: Life's Amazing Energy Factory
Year 10 Science Understanding how plants power our world The process that sustains all life on Earth
What Do You Already Know?
How do plants get their energy? Why are plants green? What do plants need to survive? How are plants connected to our breathing?
What is Photosynthesis?
The process plants use to make their own food Converts light energy into chemical energy (glucose) Occurs mainly in the leaves of plants Essential for almost all life on Earth
The Photosynthesis Equation
The Raw Materials
Carbon dioxide (CO₂) - absorbed through stomata Water (H₂O) - absorbed through roots Light energy - captured by chlorophyll All three are essential for the process to occur
Where Does Photosynthesis Happen?
{"left":"Mainly occurs in leaves\nChloroplasts contain chlorophyll\nChlorophyll captures light energy\nStomata allow gas exchange","right":"Some photosynthesis in green stems\nRoots provide water and minerals\nVascular system transports materials\nGuard cells control stomata opening"}
The Role of Chlorophyll
Green pigment found in chloroplasts Absorbs light energy (mainly red and blue light) Reflects green light - that's why plants look green! Converts light energy into chemical energy
Light and Leaf Experiment
Cover part of a leaf with foil for 48 hours Test the leaf with iodine solution Observe the difference in starch production Discuss what this tells us about light's importance
The Two Stages of Photosynthesis
Why is Photosynthesis Important?
Produces oxygen that we breathe Forms the base of most food chains Removes carbon dioxide from the atmosphere Provides energy for almost all life on Earth
Think About This...
"Every breath you take contains oxygen that was once part of a water molecule inside a plant leaf."
Summary: Photosynthesis Facts
Plants convert light energy into chemical energy (glucose) Requires carbon dioxide, water, and light Produces glucose and oxygen Happens mainly in leaf chloroplasts Essential for life on Earth