The Figure Below Shows the Results of a Study to Determine

question 55

Multiple Choice

The figure below shows the results of a study to determine the effect of soil air spaces on plant growth.

-The best explanation for the shape of the growth response curve in the above figure is that

• A)the plant requires air in the soil for photosynthesis.
• B)the roots are able to absorb more nitrogen (N₂)in high levels of air.
• C)most of the decrease in weight at low air levels is due to transpiration from the leaves.
• D)increased soil air produces more root mass in the soil but does not affect the top stems and leaves.
• E)the roots require oxygen for respiration and growth.

---

Definitions:

Resource Removal

The extraction of natural resources from the environment for human use, such as mining, logging, or fishing.

Economic Growth

An increase in the production of goods and services in an economy over a period, often measured by the rise in the real GDP.

WWI

World War I, a global conflict that lasted from 1914 to 1918, involving many of the world's great powers and marking significant shifts in geopolitical and social structures.

Non-Renewable Sources

Energy sources such as fossil fuels and minerals that do not replenish within a human timescale.