Question

what would happen when photosynthesis on earth stop

Answer 1

Plants won't be able to synthesize food.So,they won't live and eventually will die.So,it will affect the ecosystem and the food chain and heterotrophs would die too.So,all forms of life will come to a halt.

Answer 2

When photosynthesis on earth will stop, then plants would not absorb the carbon dioxide exhaled by humans. There will be no production of oxygen gas in the atmosphere which will be quite dangerous for the human race as it will become extinct in a few moments.
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