Read e-book online Tree (Eyewitness) PDF

By David Burnie

ISBN-10: 1405305487

ISBN-13: 9781405305488

Were you aware unmarried seed can go an ocean? Or what occurs while a leaf dies? find out about the several sorts of the world's bushes, from the tiny acorn to woodland giants of California. every little thing you want to find out about something to do with bushes and nice for venture paintings.

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EGG-SHAPED CONES The cones of true cedars are smooth and egg-shaped. They consist of a spiral stack of scales, each of which has two seeds attached to it. When a cone is mature, the tip breaks up, and very gradually all the scales fall to the ground. (c) 2011 Dorling Kindersley. All Rights Reserved. 44 ON SHOW Cedar cones sit upright on the branches. They take up to three years to mature and a number of years to disintegrate. Shell surrounding seed kernel Mature cone Young cone Mature cone Scale Scotch pine seeds NATIVE PINE INSIDE A PINE CONE It takes up to three years for the female pine “flower” to develop into the familiar seed-bearing cone.

Each seed has a delicate wing, which is pressed against the scale for protection. In the stone pine, whose cone is shown here sliced in half, the seeds are large and have a tough shell. These seeds are the pine kernels that are used in cooking. Scales open in dry weather Young green cones The Scotch pine has small pointed cones. This species is one of only three conifers native to Britain, the others being the yew and the juniper. Scales close completely in wet weather WHITE TIPS White, or Weymouth, pine is one of a number of pines that have long, cylindrical cones that look like spruce cones in outline.

All Rights Reserved. 53 Pollution and disease The complicated processes that power a tree’s growth need clean air if they are to work efficiently. Across many parts of the world, the air is now highly polluted by fumes from cars, and gases from factories and power stations. These fumes reach high into the atmosphere and mix with water and other chemicals to form rain that can be as acid as vinegar. Although there is much argument about the processes involved, there is little doubt that this “acid rain” is responsible for the decline of many forests.

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Tree (Eyewitness) by David Burnie


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