Get Science Readers - Life Science: Inside Ecosystems and Biomes PDF

By Debra J. Housel

ISBN-10: 0743905911

ISBN-13: 9780743905916

Discover a few of the sorts of ecosystems and biomes during this attention-grabbing name that makes use of vivid photos, enticing charts and graphs, interesting evidence, and easy-to-read textual content to captivate readers from starting to finish! Readers can be enthralled as they find out about such ecosystems and biomes because the tundra, grassland, wilderness, temperate forests, rainforests, or even riparian and pelagic biomes. A word list and index are incorporated to help in readers' additional figuring out of the content material whereas a fascinating and intriguing test is featured to maintain young ones thrilled and interested!

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Additional info for Science Readers - Life Science: Inside Ecosystems and Biomes (Science Readers: Life Science)

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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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Science Readers - Life Science: Inside Ecosystems and Biomes (Science Readers: Life Science) by Debra J. Housel

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