Question

How did plants originate on earth?

Answer 1

Land plants evolved from ocean plants. That is, from algae.

Plants are thought to have made the leap from the oceans onto dry land about 450 million years ago. And, as seeds are thought to have developed to keep plant embryos from drying out, it makes sense that the first seeds we know of are at least 360 million years old.

Plants germinate from plants and the various life processes and chemicals (hormones) together help the plant to grow.