Why do birch trees have black streaks on their trunk?

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.

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A. The allele frequency changed.
B. A new mutation allowed moths to survive.
C. Moths learned to adapt to their environment.
D. The light moths had an advantage.

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B.) It decreases oxygen in the water, creating a toxic environment.
C.) It increases the carbon dioxide in the water, stimulating plant growth.
D.) It increases the oxygen in the water, stimulating plankton growth.

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A. Species A and B are more closely related than species C and D.
B. Species C and D are more closely related than species A and B.
C. Species A and C are related.
D. Species B and D are related.

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Question 3(Multiple Choice Worth 2 points)

(6.02 MC)Innovative ideas may someday lead to a new way of addressing significant marine issues. Which of the following should be considered when evaluating the costs and benefits of a new innovative process?
Cost to build
Effort and time to implement
Maintenance and recurring costs

I and II only
I and III only
II and III only
I, II, and III


Question 4(Multiple Choice Worth 2 points)

(6.02 LC)Which of the following factors would best contribute to a measurement of environmental quality?
Average temperature
Water clarity
Salinity levels
Average speed of sound


Question 5(Multiple Choice Worth 2 points)

(6.02 MC)Two new products are competing for grant money, with the goal of cleaning up the marine environment. Each product removes plastic from the ocean.
Product 1 can be used in the open ocean and requires monitoring once every three months to retrieve collected plastic.
Product 2 is designed to be used in harbors and marinas and requires monitoring once per week to retrieve collected plastic.
If all other costs and benefits are equal, which of these products would you recommend for the grant?
Product 1 because it requires less monitoring, reducing the overall cost
Product 1 because it is presumed to be more effective at removing plastic
Product 2 because it would provide more job opportunities for local people
Product 2 because it would probably last longer in marinas than in the open ocean


Question 6(Multiple Choice Worth 2 points)

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Countries with high populations are likely to use more resources.
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Countries with low populations are likely to use more resources.
There is no correlation between population size and resource use.

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Question 4 options:

hypothesis


solution


variable


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