A plant is a living thing that stays fixed in the ground and makes its own food, using light. Grass, daisies, tomato plants and trees are all plants. Most plants are green.
Examples
Example 3.2 (The daisy is alive)
Check the signs of life on a daisy: it was born from a seed; it feeds — with water from the soil and light from the sky; it grows; it makes seeds that become new daisies; it dies in the frost. All the signs are there. The daisy is as alive as the cat — it is just much quieter about it.
Example 3.5 (Pulling up a weed)
Pull a weed gently out of loose, wet earth and you bring up the hidden part: a tuft of pale roots, sometimes longer than the whole green plant above. Now the plant can be read from bottom to top: roots, stem, leaves — and, if you are lucky, a flower.
Example 3.9 (The forgotten plant)
Forget to water the classroom plant before the holidays: its leaves hang down, soft and sad — it wilts. Water it, and a few hours later the leaves stand up again. Water was the missing need.