A leaf is the principal lateral appendage of the stem which is in turn part of a plant. Hence a leave is an organ of a vascular plant. The shoot is formed together by the stem and the leaves. Foliage is a term used for referring leaves collectively. As is one must have often heard, 'autumn foliage'. The characteristic of this plant organ is that it is a dorsoventrally flattened organ, usually borne above the ground, and specialised for its function of photosynthesis. Photosynthesis is the process of converting the intake of carbon dioxide into oxygen. The primary photosynthesis tissue, in most leaves, known as palisade mesophyll, is located on the upper side of the blade or lamina of the leaf. However there are still exceptions, like in some species, including the mature foliage of Eucalypts, palisade mesophyll is present on both sides and these leaves are said to be isobilateral.
Many leaves have a distinct upper surface, also known as adaxial and distinct lower surface called abaxial which differ in colour, the number of stomata ( stomata are the pores present on leaves that intake and output gases), hairiness, the amount and structure of epicuticular wax and other features. When talking about the colour of leaves, they are mostly green, but there are always exceptions.

In this sub category you can download free PNG images: Leaf Nature. In this category "Leaf" we have 290 free PNG images with transparent background.

  • Vine Leaf Grape Bunch Free HD Image PNG Image
    Vine Leaf Grape Bunch Free HD Image
    Format: PNG
    Resolution: 886x1135
    Size: 204.2KB
    Downloads: 52
  • Vector Green Leafs Download HD PNG Image
    Vector Green Leafs Download HD
    Format: PNG
    Resolution: 2565x2388
    Size: 3.7MB
    Downloads: 52
  • Green Leafs PNG Download Free PNG Image
    Green Leafs PNG Download Free
    Format: PNG
    Resolution: 512x384
    Size: 66.9KB
    Downloads: 51
  • Vector Green Leafs Free Clipart HQ PNG Image
    Vector Green Leafs Free Clipart HQ
    Format: PNG
    Resolution: 582x596
    Size: 18.7KB
    Downloads: 51
  • Photos Green Leafs Free Transparent Image HQ PNG Image
    Photos Green Leafs Free Transparent Image HQ
    Format: PNG
    Resolution: 1600x1200
    Size: 593.1KB
    Downloads: 49
  • Green Leafs Free Transparent Image HD PNG Image
    Green Leafs Free Transparent Image HD
    Format: PNG
    Resolution: 796x1456
    Size: 290.9KB
    Downloads: 48
  • Green Pic Organic Leafs HQ Image Free PNG Image
    Green Pic Organic Leafs HQ Image Free
    Format: PNG
    Resolution: 2291x1850
    Size: 2.6MB
    Downloads: 48
  • Green Organic Leafs Free Download PNG HD PNG Image
    Green Organic Leafs Free Download PNG HD
    Format: PNG
    Resolution: 1006x366
    Size: 280.7KB
    Downloads: 48
  • Vector Green Leafs HQ Image Free PNG Image
    Vector Green Leafs HQ Image Free
    Format: PNG
    Resolution: 512x512
    Size: 3.7KB
    Downloads: 48
  • Vector Green Leafs HQ Image Free PNG Image
    Vector Green Leafs HQ Image Free
    Format: PNG
    Resolution: 1266x883
    Size: 518.1KB
    Downloads: 44

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