Which division among plants has the simplest organisms?

Which division among plants has simplest organisms ?

Monocot and Dicot plants Which division of plants does this plant come under?

A student was doing an experiment on increasing the cell division among plants. She asked her supervisor to suggest the specific plant hormone for the same. Had you been her supervisor, which plant hormone would you suggest ?

Spirogyra Which division of plants does this plant come under?

Funaria Which division of plants does this plant come under?

Cycas Which division of plants does this plant come under?

Fern Which division of plants does this plant come under?

Which division of Plantae is considered the oldest vascular plants ?