Can someone tell me what they want when they say "type of visible light"? The plants were in a window and received the morning sun.

Question

Question:
What type of visible light is made available to for plants grown under the clear, red, or blue plastic?

Answer 1

red

Answer 2

I need to know the "type of visible light?" Is it sunlight?

Answer 3

sunlight is fine, that's what they used in the experiment that I saw. I did something more complicated with this but in another experiment with spinach circles.