Question

Why do birch trees have black streaks on their trunk?

Answer 1

Short answer - to breathe.
Long answer - the black streaks on the trunk of birch trees are called lenticels, and their function is to enable the exchange of gases between the tree and the air. So, in a way, this makes the whole process of photosynthesis a lot easier for birch trees.

Answer 2

The birch tree has a thin papery eye like structure that act as pores. It helps in providing the pathway for gaseous exchange.

Further Explanation:  

The species of birch trees are usually small or medium in size. They are generally found on the northern side of Asia, NorthAmerica and Europe that has a temperate climate.A number of different types of birch grow in clumps of two or more closely spaced separate trunks.

The tree has light-colored bark that can be of white, gray or yellowish color. It is separated into thin papery plates and a horizontal line that is dark in color. They are referred to as lenticils that has a lens-shaped structure. They appear as pores that help in direct gaseous exchange between the plants and the outer environment. The barks are impermeable to gases but in this plant, they help in the exchange of gases through this pore.

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Answer Details:

Grade: High School

Subject: Biology

Chapter: Plant cell

Keywords:

Birch, tree, papery, pores, gaseous, northern, colored, horizontal, lenticils, environment, impermeable, plants.