|If black color absorbs the most heat, then why is
plant life mostly green?|
|Question Date: 2013-04-10|
Plants do not use heat to make their food.
Instead, they convert light energy into useful
chemical energy. It turns out that the pigments
(called "chlorophyll" molecules) that are
responsible for harvesting light energy from the
sun are green in color. These chlorophyll
molecules absorb light from the sun and transfer
this energy by "bouncing" electrons around the
chloroplast, which is the organelle that houses
chlorophyll molecules. The chloroplast uses the
"movement" of the electron to generate a chemical
called "ATP," which the plant uses as a source of
Plants don't absorb heat; they absorb light.
Specifically, they absorb blue light and red
light, but not green light.
Ironically, the largest part of the sun's
energy comes out as green light. Why plants don't
use it instead of the less common blue and red I
You´re correct that black color absorbs the
most light and reflects the least light, and white
color reflects the most light so it absorbs the
least. When we talk about what we see we are
actually talking about reflection, the opposite of
absorption. Plants reflect green light - this is
why we `see´ them as green. Plants actually use
much of the light spectrum, particularly red and
blue light. These colors are then absorbed by the
plant. But plants do not use green light, so they
reflect it back and we see green!
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