There are a ton of variables but yes it's possible.
A red dwarf's luminosity is between a tenth and a ten-thousandth of our sun's, so even the brightest ones are dim. But sunlight hitting the planet Mercury is about 7x as bright as on Earth, and we've already observed exoplanets that are closer to their suns than Mercury is to ours. So a planet close to a red dwarf could theoretically get as much daylight as we do.
Also, lots of plant life exists in very low light conditions on Earth - and not just mushrooms etc. growing in caves. Plants under rainforest cover get as little as 2% of full sunlight. That's very much in the range of what plants out in the open could get on a world orbiting a red dwarf.
HeebieMcJeeberson t1_jaf2eit wrote
There are a ton of variables but yes it's possible.
A red dwarf's luminosity is between a tenth and a ten-thousandth of our sun's, so even the brightest ones are dim. But sunlight hitting the planet Mercury is about 7x as bright as on Earth, and we've already observed exoplanets that are closer to their suns than Mercury is to ours. So a planet close to a red dwarf could theoretically get as much daylight as we do.
Also, lots of plant life exists in very low light conditions on Earth - and not just mushrooms etc. growing in caves. Plants under rainforest cover get as little as 2% of full sunlight. That's very much in the range of what plants out in the open could get on a world orbiting a red dwarf.