Ability to grow in shade may help pine trees found in the dry forests of Arizona resist drought. To test this hypothesis, investigators planted pine seedlings in a greenhouse in full light, light reduced to 25% of normal, or light reduced to 5% of normal. At the end of the study, they dried the young trees and weighed them.
What are the treatments in this study?

Question

Quizplus · Accepted Answer

The treatments in the study are the different levels of light exposure, which include full light, light reduced to 25% of normal, and light reduced to 5% of normal. The other options listed in the answer choices (full shade, different weights of dried trees, and the greenhouse and Arizona forests) are not treatments in this study.

Ability to Grow in Shade May Help Pine Trees Found