<P> Although leaves can be seen in many different shapes , sizes and textures , typically a leaf is a thin , dorsiventrally flattened organ , borne above ground and specialized for photosynthesis . In most leaves , the primary photosynthetic tissue , the palisade mesophyll , is located on the upper side of the blade or lamina of the leaf but in some species , including the mature foliage of Eucalyptus , palisade mesophyll is present on both sides and the leaves are said to be isobilateral . Most leaves have distinctive upper surface ( adaxial ) and lower surface ( abaxial ) that differ in colour , hairiness , the number of stomata ( pores that intake and output gases ) , epicuticular wax amount and structure and other features . </P>
<P> Although leaves can be seen in many different shapes , sizes and textures , typically a leaf is a thin , dorsiventrally flattened organ , borne above ground and specialized for photosynthesis . In most leaves , the primary photosynthetic tissue , the palisade mesophyll , is located on the upper side of the blade or lamina of the leaf but in some species , including the mature foliage of Eucalyptus , palisade mesophyll is present on both sides and the leaves are said to be isobilateral . Most leaves have distinctive upper surface ( adaxial ) and lower surface ( abaxial ) that differ in colour , hairiness , the number of stomata ( pores that intake and output gases ) , epicuticular wax amount and structure and other features . </P>
which tissue is present in the veins of leaves
which tissue is present in the veins of leaves
the primary photosynthetic tissue , the palisade mesophyll
the primary photosynthetic tissue , the palisade mesophyll