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Why do most conifers have needlelike or scalelike leaves?
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conifer
A giant sequoia (Sequoiadendron giganteum) estimated to be between 1,900 and 2,400 years old, Grizzly Giant is the oldest tree in the Mariposa Grove, Yosemite National Park, California.
Most conifers have needlelike or scalelike leaves primarily to minimize water loss. The reduced surface area of these shapes is an effective adaptation for conserving moisture.1
Even in species with broader leaves, conifers often possess a thick, waxy coating that renders the leaves waterproof. Furthermore, the gas-exchange openings, known as stomates, are typically restricted to narrow bands on the underside of the leaf and are deeply sunken into chambers. This structural arrangement separates the stomates from direct contact with the surrounding dry air, further protecting the plant from desiccation.1