Why might a plant evolve a brain and the ability to move?

I was thinking of a situation in which an Extra Terrestrial plant life form evolves a nervous system and eventually a brain. This plant diversifies into a variety of different life forms with some living in the water, some living on land, and some flying through the sky. It is able to move and its brain controls its movements. It has eyes for seeing, organs that it uses for smelling, and organs for hearing. It derives all of its energy directly through photosynthesis. Most species of this plant have keener senses and a more intelligent brain and the ability to move faster than most animals on this planet.

What type of selective pressure might have caused this plant to evolve a brain and the ability to move?

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Why might a plant evolve a brain and the ability to move?

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