Answer:
[tex] \huge \tt \green{✍ Answer}[/tex]
Light of wavelength 550 nm is least effective at promoting photosynthesis.
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--> Light intensity:-
Without enough light, a plant cannot photosynthesise very quickly - even if there is plenty of water and carbon dioxide and a suitable temperature. Increasing the light intensity increases the rate of photosynthesis, until some other factor - a limiting factor - becomes in short supply.
