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

Figure 37.1
-The data in Figure 37.1 indicate that the plant

Question

Figure 37.1 shows the results of a study to determine the effect of soil air spaces on plant growth.
  
Figure 37.1
-The data in Figure 37.1 indicate that the plant

Quizplus · Accepted Answer

The correct answer is D because it combines the observations that the plant grows similarly at 15% and 20% soil air levels and also indicates that the plant's optimal growth occurs at soil air levels above 15%. This suggests that while there is no significant difference in growth between 15% and 20%, there is an improvement in growth at higher air levels, indicating the plant's preference for more aerated soil conditions.

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