The ancestors of land plants likely evolved from

Ans.

Land plants were evolved on the Earth around 850 million years ago. The ancestors of plants are considered as plant-like single cell organisms.  These organisms include tiny protists, that were capable of performing photosynthesis as nearly all land plants perform photosynthesis. An example of photosynthetic protist is green alga.

Thus, 'the ancestors of land plants likely evolved from single-cell, photosynthetic protists, such as green algae.'