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Hereof, can you live without plants?

Without plant life, there would be no photosynthesis. Photosynthesis stores solar energy in a form plants can use. Carnivours eat Herbivorous animals, and herbivorous animals eat plants. Without plants herbivorous animals die, then us carnivors die and life ends on planet.

Furthermore, how long could we live without plants? 13.75 years

Furthermore, what will happen if we do not have plants?

When green plants make food, they give off oxygen. This is a gas that all animals must breathe in order to stay alive. Without plants, animals would have no oxygen to breathe and would die. Without plants there would be no food to eat!

What would happen if the plants on Earth were destroyed?

For this: all humans dead and gone. Because unless earth has a way to make more oxygen that I've missed, humans would suffocate without trees making oxygen. Plus lots of animals would die from there being no food (the herbivores would have no plants to eat and the carnivores would have no herbivores to eat).