What would happen if a planet like Earth were to be tidal locked to the sun?
What effects could it have on lifeforms like plants? Would they always produce oxygen?
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It wouldn't necessarily be different from our own plants.
Some Earth plants can survive in perpetual daylight, even thrive. The dark cycle, or Calvin cycle, does not require dark, it just does not need light.
A planet where that occurs, most likely tidally locked, also does not need to lack seasons. A tidally locked planet can still have the precession that causes seasons on Earth, that is, the planet could present librations relative to its star. For instance, our moon is tidally locked to Earth, but presents librations.
Characteristics of plants which evolved on such a world would be hard to guess at, but if we found them to be rather similar to Earth plants it would not be entirely surprising.
I am assuming you mean the environment of a daylight-facing side of a tidally locked planet.
If the plants originate naturally on that planet, they would have a different time-keeping mechanism, other than day-night cycle.
If you take earth plants to that environment, they would boom in the early part their life cycle and then die out as they exhaust themselves out, storing energy in the form of glucose and cellulose and not getting any time for respiration.
During summer the northern areas of the planet have daylight nearly all day. Of course, that is not year round, but if you do some research you might find some plants in the north that only thrive in summer. Figure out what they are and base your new planet's plant-life on them. Sorry, I'm not a plant guy, but maybe some Alaskan can just step outside and look. Haha. Bottom line is, I'm pretty sure plants would thrive there, they just wouldn't be exactly the same plants we have on Earth.