Ace the Certified Arborist Test 2025 – Branch Out and Leaf Your Mark!

Question: 1 / 400

Which type of disorder do girdling roots, nutrient deficiencies, and leaf scorch represent?

Biotic

Abiotic

The correct choice indicates that girdling roots, nutrient deficiencies, and leaf scorch are considered abiotic disorders. Abiotic disorders are caused by non-living factors that can negatively impact a plant's health.

Girdling roots occur when roots wrap around the base of the trunk, restricting water and nutrient uptake, and ultimately leading to stress or decline. Nutrient deficiencies arise when a plant lacks essential nutrients in the soil, which can cause various growth issues and visible symptoms like chlorosis or poor foliage quality. Leaf scorch results from environmental stressors, such as drought or high temperatures, which can cause the edges of leaves to brown and die back.

These examples illustrate how non-living factors—like soil quality, environmental conditions, and physical root issues—affect the physiological function and overall health of plants, categorizing them as abiotic disorders.

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Physiological

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