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.

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  Falling Leaf Download HQ Image Free PNG
  Format: PNG
  Resolution: 472x349
  Size: 159.4KB
  Downloads: 207
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  Format: PNG
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  Size: 128.8KB
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  Format: PNG
  Resolution: 1920x1080
  Size: 1.4MB
  Downloads: 244
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  Falling Leaf Photos Download HD PNG
  Format: PNG
  Resolution: 852x480
  Size: 138.5KB
  Downloads: 286
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  Falling Leaf Download Free Image
  Format: PNG
  Resolution: 590x300
  Size: 283.9KB
  Downloads: 207
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  Format: PNG
  Resolution: 1024x1143
  Size: 468.2KB
  Downloads: 208
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  Falling Leaf HQ Image Free PNG
  Format: PNG
  Resolution: 545x472
  Size: 179.7KB
  Downloads: 193
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  Falling Leaf Free Photo PNG
  Format: PNG
  Resolution: 1920x1080
  Size: 686.5KB
  Downloads: 224
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  Falling Petals Free Clipart HQ
  Format: PNG
  Resolution: 1920x1080
  Size: 543.3KB
  Downloads: 236
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  Resolution: 852x480
  Size: 75.8KB
  Downloads: 238
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  Format: PNG
  Resolution: 1920x1080
  Size: 1.0MB
  Downloads: 282
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  Format: PNG
  Resolution: 1920x1080
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  Format: PNG
  Resolution: 1024x576
  Size: 299.3KB
  Downloads: 250
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  Falling Petals Photos PNG Image High Quality
  Format: PNG
  Resolution: 852x480
  Size: 100.3KB
  Downloads: 188
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  Falling Petals Free Download PNG HD
  Format: PNG
  Resolution: 730x1095
  Size: 190.1KB
  Downloads: 210
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  Format: PNG
  Resolution: 1920x1080
  Size: 560.2KB
  Downloads: 206
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  Falling Petals Image Free HQ Image
  Format: PNG
  Resolution: 650x492
  Size: 125.7KB
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  Falling Petals Free Download PNG HQ
  Format: PNG
  Resolution: 894x894
  Size: 986.3KB
  Downloads: 280
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  Falling Petals Free HQ Image
  Format: PNG
  Resolution: 894x894
  Size: 842.2KB
  Downloads: 212
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  Soap Bubbles Free Download Image
  Format: PNG
  Resolution: 1921x1893
  Size: 1.1MB
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