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yellow, because green+red makes yellow in the addition of light!
black
You may not know it, but sunlight is actually a mixture of all the colors of the rainbow. Chlorophyll absorbs most of colors in light but not green. plants look green because chlorophyll reflects green light.Read more: Why_does_chlorophyll_make_a_plant_look_green
it reflects green light
Green light - Green, White light - Green, Red light - Black
The lemon will appear black as there is no yellow light to be reflected.
Green.
While the ball would still be green it will appear black. Anything green absorbed all colours except green. The green light is reflected to your eyes which makes it look green. Thus in red light (with no green in it) the red will be absorbed and no green light can be reflected to your eyes so the ball will look black.
The pigment responsible for photosynthesis (Chlorophyll) reflects the green wave length of sunlight when light fall on the leaf. That is why leaves appear green in the presence of light.
Pink.
presence of Chlorophyll in the cells of leaf reflects the green spectrum of light hence the leaf appear green.
cyan