Although Some Dwarf Willows grow just a few centemetres high, trees are generally the largest of all plants. Indeed the giant redwood tree is the biggest of all living things. Trees can grow big because they don't have soft, green 'herbaceous' stem like other plants; they have stiff, brown, woody stems, covered in protection bark,that can grow tall and support an enormous weight of leaves. With most trees there is a single thick central stem the tunk and leaves and side branches only grow some way off the ground so they are well out of the reach of most browsing animals.
Facts: About tree trunks
∆ Slicing thought a trees tunk can reveal a lot about it's history it's age the rate at which it has grown and the conditions it has faced over the years.
•Inside the trunk
The centre of a trunks is the dead 'heartwood'. The living part is the middle the 'sapwood' and the 'cambuin'. Outside Is a protection layer of bark.
•Tree rings
Each ring inside the trunk represent a year's growth. Rings close together indicate slow growth; ring far apart indicate rapid growth.
Facts; About seeds
•Seed production
Because only a small portion of their seeds survive most trees produce thousands each year.
•Seed dispersal
The seeds of many trees are dispersed by wind so are shaped ti became airbone easily maple tree seeds are encased in a pair of flat wings while willow seeds are shaped like tiny parachutes.