Certified Arborist Practice Test

Question: 1 / 400

What does the term "mortality spiral" refer to?

A continuous cycle of plant growth

The cumulative effects of stress causing plant decline

The term "mortality spiral" refers to the cumulative effects of stress causing plant decline. This concept describes how various stressors, such as environmental changes, disease, pests, and poor growing conditions, can interact to weaken a plant over time. As a plant becomes increasingly stressed, its ability to compete for resources, resist disease, and recover from injuries diminishes, leading to a downward spiral of health and vitality. The term encapsulates the idea that each stressor contributes to a worsening condition, ultimately increasing the likelihood of mortality.

The other choices do not accurately describe the concept of mortality spiral; one suggests a growth cycle unrelated to stress, another refers to a pruning technique that doesn't involve cumulative decline, and the last one discusses improving soil quality, which is a separate aspect of plant health management.

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A method of pruning trees

A strategy for enhancing soil quality

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