Question

what will happen if all the plants perish from the world
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Answer 1

If all the plants perish from the earth then there will be no life. Plants are the main producers of oxygen. During the process of photosynthesis plants take in carbondioxide and give out oxygen which helps the humans in reducing the level of CO₂ in the atmosphere.

Answer 2

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⭕If all plants diminish or perish then there will be an end to the supply of oxygen as plants produce oxygen with the process of photosynthesis. All living beings will eventually die in the absence of oxygen.