Why pines have pinnate leaves
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Meghna Thapar 5 years, 6 months ago
Pines have needle like leaves. The needles of pines are arranged in a spiral about the stem. ... Like the leaves of all higher plants, pine needles have special microscopic pores on their surface, called stomata, which are important for exchange of water vapor, carbon dioxide, and oxygen. In particular, the outer surface of pine needles has a thick waxy layer, called a cuticle, which reduces evaporative water loss. At the microscopic level, the stomata are beneath the surface cells, so they are often called "sunken stomata." This stomatal adaptation reduces evaporative water loss.
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