plants
Leaves look solid, but they actually have thousands of tiny little doors you can't even see!
Leaves are covered in thousands of microscopic pores called stomata, which open and close to let carbon dioxide in and oxygen and water vapor out, much like how our lungs exchange gases when we breathe. Plants need this constant gas exchange to carry out photosynthesis, the process that turns sunlight into food.
Stomata aren't there to trap bugs, and plants don't 'drink' sunlight through any hole — sunlight is absorbed by the whole leaf surface using a pigment called chlorophyll, which is a completely different process from breathing air in and out.
On most plants, stomata are found mainly on the underside of leaves, which helps reduce water loss from the sun beating down on the top surface all day.
plants
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