1) Needle shape helps the leaves to retain moisture, preventing water loss as the stomatas are sunken and tightly packed in needle like leaves. 2)Needle shape gives them ability to shed snow as pine trees are found in cold regions.
increase the photosynthetic surface area of these plants.because the geographical regions where the pine trees are growing would not allow them to have broad leaves and they have to conserve water also. In addition needle like leaves of the pine trees
Trees such as pines, spruce, etc. are conical in shape with needle-like leaves. This adaptation allows snow and rainwater to slide off easily.