Figure 371 Shows the Results of a Study to Determine the the Effect

question 29

Multiple Choice

Figure 37.1 shows the results of a study to determine the effect of soil air spaces on plant growth.

Figure 37.1
-The best explanation for the shape of the growth response curve in Figure 37.1 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.

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