ACT Preparation / Unit 22 ACT 2102 short lesson, about 20 seconds
Photosynthesis
Captions available
The idea
Photosynthesis uses carbon dioxide, water and light energy to make glucose and oxygen. It captures the sun's energy in chemical compounds that nearly all life depends on.
In practice
A leaf in sunlight takes in carbon dioxide and releases oxygen.
Where people slip
Keep the inputs and outputs straight: carbon dioxide and water go in; glucose and oxygen come out.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Unlocks
Something wrong in this lesson? Flag it · Sources for ACT Preparation