ISA Certified Arborist Practice Exam

What does "root grafting" enable?

1. Improved leaf photosynthesis

2. Flower production enhancement

3. Transfer of nutrients between trees

4. Increased drought resistance

The correct answer is: Transfer of nutrients between trees

Root grafting enables the transfer of nutrients between trees. This process occurs when the roots of two or more trees join together, forming a graft. Through the graft, trees can share resources such as water and nutrients, allowing for better growth and survival, especially in situations where one tree might be struggling due to poor soil conditions or pest pressures. This ability to share resources is particularly beneficial in forest ecosystems or in managed landscapes where a group of trees is planted close together. The interconnected root systems can enhance nutrient uptake and overall tree health. The other options, such as improved leaf photosynthesis, flower production enhancement, and increased drought resistance, are not directly related to the primary benefit of root grafting. While healthy trees may exhibit strong photosynthesis or flower production as a result of better nutrition from their grafted partners, these are secondary effects rather than primary purposes of root grafting itself.