Evergreen trees are tree which shed their leaves throughout the year as they are covered with leaves all the time. These are persistent in all four seasons. In contrast to deciduous plants which completely loose their foliage during winter or dry season.
Pinus does not shed its leaves during a particular season and is always evergreen. Hence Pinus is considered as an evergreen tree belongs to gymnosperms.
So Pinus is evergreen, coniferous resinous tree.
The leaves in gymnosperms are well-adapted to withstand extremes of temperatures, humidity and wind.
In conifers, the needle-like leaves reduces the surface area. Their thick cuticle and sunken stomata also help to reduce water loss.
The flowering plants under conditions of extreme cold shed their leaves and become dormant. But Pinus due to the presence of bark, which is thick, needle-like leaves having sunken stomata, reduce the rate of transpiration. The cold areas are physiologically and physically dry due to scanty rainfall, precipitation as snow, decreased root absorption at low temperature and exposed habitats. But, Pinus is well adapted to such conditions. It continues to manufacture food during this period and grown to dominate other plants. This shows that Pinus is an evergreen tree. It does not shed its leaves, i.e., needles under any condition.
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