Dear Md. Nuruzzaman,

This can vary per plant, as there are several types of chromophores that serve photosynthesis. A very good place to start is the collection of the CIE on plants and photosynthesis. See this freely accessible web page (and look for "plant") https://cie.co.at/publications/cie-collection-photobiology-and-photochemistry

Also using the term "action spectrum" in combination with "photosynthesis" will reveal a lot of useful information. If you multiply an action spectrum (the spectral weighting function of how strong the investigated effect occurs per wavelength) with the spectral power distribution of the irradiating light source, you get the answer to your question.

1%to 2% of sunlight is available for plants. Particularly, for photosynthesis.

The question is very nice and the efficacy can be influenced by a number of factors; external/environmental and internal or plant factors. The following article is very helpful, read it.

Thank you!

1 percent only

when I was a student, we were taught that it was about 1%

1%