Plant, any member of the plant kingdom—a realm of nature made up largely of living organisms that make their own food. Plant life in general is called vegetation. Flora refers to the plant life of a particular locality or geologic age. The scientific study of plants is called botany. Traditionally, biologists have placed bacteria, fungi, slime molds, and algae in the plant kingdom; today, most biologists place them in other kingdoms.
Pollen grains are, in essence, plant sperm. But how do the grains get where they need to go, and what's the advantage of trusting your genetic future to the winds?
Thinking allows us to solve problems, plan ahead and defend ourselves from outside threats. It's what separates us from "lower" life-forms like plants, right? Well, maybe not.