Wood is a fibrous and porous tissue found in the roots and stems of trees and other woody plants. Wood falls under the category of organic material, it is a natural composite of cellulose fibers that are strong in tension and embedded in a matrix of lignin which resists compression. Sometimes the definition of wood is represented as it is the only secondary xylem in the stems of trees, or defining it more broadly to include the same type of tissue elsewhere such as in the roots of shrubs and trees. Wood performs the function of providing support, in living trees, enabling them to grow large or stand up by themselves. It also acts as a medium to convey water and other minerals and nutrients between the leaves, growing tissues and the roots. 
Wood has been used for several purposes since a very long time for fuel, for making weapons and tools, as a construction material, for the manufacturing of paper and furniture. Not long ago it also emerged as the feedstock for the production of purified cellulose and its derivatives, such as cellulose acetate and cellophane. Forty seven percent of the growing livestock in forests worldwide was used for commercial purposes, as of the year 2005.

In this sub category you can download free PNG images: Wood Nature. In this category "Wood" we have 25 free PNG images with transparent background.

  • Shutterstock Wood Signs Free Clipart HQ PNG Image
    Shutterstock Wood Signs Free Clipart HQ
    Format: PNG
    Resolution: 1302x738
    Size: 1.3MB
    Downloads: 601
  • Billboard Wood Signs Sign Free PNG HQ PNG Image
    Billboard Wood Signs Sign Free PNG HQ
    Format: PNG
    Resolution: 756x1000
    Size: 367.7KB
    Downloads: 410
  • Rope Wood Plank Sign HD Image Free PNG PNG Image
    Rope Wood Plank Sign HD Image Free PNG
    Format: PNG
    Resolution: 553x471
    Size: 162.7KB
    Downloads: 396
  • Wood Signs Free PNG HQ PNG Image
    Wood Signs Free PNG HQ
    Format: PNG
    Resolution: 2244x2803
    Size: 2.9MB
    Downloads: 411
  • Poster Sand Gratis Soil Free HQ Image PNG Image
    Poster Sand Gratis Soil Free HQ Image
    Format: PNG
    Resolution: 945x709
    Size: 596.4KB
    Downloads: 251

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