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Leaf
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For other uses, see
Leaf (disambiguation).
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The leaves of a
Beech tree.
In
botany, a leaf is an above-ground
plant organ specialized for the process of
photosynthesis. Leaves are typically flat (laminar) and thin, which evolved as a means to maximise the surface area directly exposed to
light. Likewise, the internal organisation of leaves has evolved to maximise exposure of the photosynthetic
organelles, the
chloroplasts, to
light and to increase the
absorption of
carbon dioxide, in a process called
photosynthesis. Most leaves have
stomata, which regulate carbon dioxide,
oxygen, and
water vapour exchange with the
atmosphere. The shape and structure of leaves vary considerably depending on climate, primarily due to the availability of light and potential for water loss due to temperature and humidity. Leaves are also the primary site, in most plants, where
transpiration... mehrLeaf aus Wikipedia.
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