Certified Arborist Practice Exam 2025 – Comprehensive All-in-One Guide to Master Your Certification!

Question: 1 / 400

Put these tissues in the correct order from outside-in: Cambium, Xylem, Bark, Phloem

Phloem, Cambium, Xylem, Bark

Cambium, Xylem, Phloem, Bark

Bark, Phloem, Cambium, Xylem

The correct order of the tissues from the outside to the inside is Bark, Phloem, Cambium, and Xylem.

Bark is the outermost layer of a tree, protecting it from environmental stresses and pathogens. Beneath the bark lies the phloem, which is responsible for transporting nutrients, particularly the products of photosynthesis, throughout the plant. The cambium is a thin layer of actively dividing cells that produce new phloem and xylem. Finally, xylem is located inside the cambium and is responsible for the transport of water and minerals from the roots to the leaves while also providing structural support.

This sequence is critical for understanding tree anatomy and the functions of each layer, making option C the correct choice. The arrangement indicates the flow of nutrients and water through the plant and the layers' protective roles, which can be essential information for someone studying arboriculture.

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Xylem, Phloem, Bark, Cambium

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