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Plants use energy from sun. Is it just sun's light energy or any form of light (like light from a tube light) can excite electrons and initiate photosynthesis.

This actually sounds a bit idiotic but in Campbell Biology 10th ed. there is a line in Ch 4. "Plants use solar energy to convert atmospheric CO2 to molecules of life...."

If it is due to sun, then how does plant know which light is from sun and which is not?

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closed as off-topic by David, anongoodnurse, Bryan Krause, Chris Sep 22 '17 at 14:27

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Homework questions are off-topic on Biology unless you have shown your attempt at an answer. For more information see our homework policy." – David, anongoodnurse, Bryan Krause, Chris
If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Plants use any light of the proper wavelengths. The sun provides a lot of light, but think of covert/indoor plant growing: the right bulbs (and enough of them) allow the plants to grow strong. $\endgroup$ – anongoodnurse Sep 19 '17 at 20:55
  • $\begingroup$ @anongoodnurse I think, you could make an answer out of your comment. $\endgroup$ – Remi.b Sep 20 '17 at 15:46
  • $\begingroup$ @Remi.b - I don't mean to sound unkind to the OP, but I think it's pretty common knowledge. $\endgroup$ – anongoodnurse Sep 20 '17 at 17:03
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    $\begingroup$ I don't think we should refuse questions because it feels too introductory to us. When not knowing the answer to such question, it might actually be hard to look for it so I don't think it shows lack of effort. I'll just answer it using your comment if you don't mind. $\endgroup$ – Remi.b Sep 20 '17 at 17:16
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As per @anongoodnurse comment:

Plants use any light of the proper wavelengths. Typically the available light to plants is the sun but if you place a plant indoor under a fair amount of light bulbs that produce light at similar wavelength that the sun, there is no reason for the plant to even notice the light is different that the sun light and the plant will grow just normally.

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