What will happen to the world if there are no plants?

Well, plants provide oxygen and carbon dioxide so if there are NO plants there will be no life, plants also provide us with food eg. Apples, Mint, Oranges, Grapes etc...

If there were no animals there will be no life. Animals also provide us with food such as chicken, ham, beef etc... .

If there were no plants there will be no animals.

If there were no animals there will be no plants.

Why you ask? Well animals help disperse seeds from one tree or plant to another.

And plants and trees feed and shelter animals. eg. Birds build their trees in nests.

Here long answer short: There will be no life without plants and animals.

Keep this in mind as well, we are ruining the earth by chopping down trees and killing animals sp please try your best to prevent yourself from doing that!