Why is pine an evergreen? Detailed answer

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Why is pine an evergreen? Detailed answer

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Why is pine an evergreen?

Pine leaves have several functions. One of them is to produce food for the whole tree. The leaves receive carbon dioxide from the air, water and mineral salts from the soil. Leaf chlorophyll absorbs solar energy. Under the influence of sunlight, chlorophyll converts carbon dioxide and water into sugar, glucose. The sugar produced in the leaves is the main food of the plant. The leaves also process a large amount of water. Only a small part of the water entering the bores is used for food production. Most of it evaporates through tiny pores on the surface of the leaves.

In North America, water supply to the tree is limited during the winter. The ground freezes and the tree does not have enough water to evaporate into the air. They need more water for this than they can get from the frozen ground. Therefore, trees are "locked" by changing the shape of the leaves so as not to lose water when it evaporates through the leaves.

Different trees have different leaves. Pine and spruce leaves are narrow, resembling needles with a thick shell. This prevents water from evaporating. And these leaves remain on the trees for many years. When the leaves fall, new ones grow in their place, and the branch never looks bare. Therefore, these trees are called evergreen.

There are also trees with ordinary, broad leaves that remain evergreen. For example, California laurel and magnolia have tough, glossy leaves that help retain moisture during the cold season.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Can ocean tide be used?

If you have ever been to the sea, you have probably paid attention to the difference in the water level near the shore at high and low tide. In some places in the world it is as much as 12 meters.

It is quite obvious that such a periodic movement of water is a powerful source of energy, to which man has not paid attention for a long time. If it were possible to use it, as is the case with waterfalls and rivers, then it would be possible to obtain a huge amount of energy, moreover, in a completely environmentally friendly way.

The first tidal hydroelectric power plant was built in France near Saint Malo in Brittany. Situated at the base of the Cotentin peninsula between Dinard and St. Malo, it can convert into electricity about half of the 56 million horsepower that is driven into the English Channel along with the Atlantic tide.

The 24 power plants installed on the dam produce 540 million kWh of electricity per year. This is less than some hydroelectric power plants built on large rivers, but the reliability of a tidal hydroelectric power plant can be relied on with much more confidence - the tides of the sea do not depend on the vagaries of variable weather!

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