A sunflower seems to watch the sun. It slowly turns its flower head as the sun moves across the sky. Can a sunflower see? If you touch the leaves of a plant called the sensitive plant, they will...
Why a plant wilts
Have you ever seen fire fighters using a fire hose? The hose looks stiff and fat while water is running through it. But when the fire is over and the fire fighters turn off the water, the empty hose...
Do plants ever move?
Plants are moving all the time. But they move so slowly we just don't notice these movements. Instead of moving from one place to another, as animals do, plants move by growing. As a plant grows, it...
Why tree bark is rough
Bark is a tree's skin. It is tough and hard and protects the soft, inside part of the tree. A tree trunk grows from the inside out. Each year, a ring of new, soft wood grows around the trunk,...
Why some leaves have bumps
> insect galls on oak leaf > > When insects lay eggs on leaves, little bumps called galls swell up > all around the eggs. Sometimes, the leaves or stems of plants become spotted with little...
What pine cones do
The pine tree is an evergreen tree with needles for leaves. The pine tree has pine cones, which are its seed makers. There are two kinds of pine cones. One is small and delicate. It is full of tiny...
Why some flowers smell nice— and some don’t
Flowers that are pollinated by insects have bright colors and sweet smells to attract the insects. salvia flower and bee grass flowers > Flowers that are pollinated by the wind don't need bright...
How some insects help flowers
All flowers are seed makers. But to make seeds, a flower must get some pollen from another flower like itself. Many flowers need the help of bees or other insects to bring pollen to them. How do...
What a flower does
how flowers make seeds > When pollen lands on a flower's stigma, a tube grows down to the > ovule. Here it joins an egg to make a seed. The fruit forms around the > seed. A flower's job is to...
Why some trees stay green all winter
The kinds of trees that people use as Christmas trees are called "evergreens." Evergreen trees are "ever green." They don't change color and lose all their leaves in autumn as other trees do. The...
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