ISA Certified Arborist Practice Test

The ISA Certified Arborist Exam tests your knowledge of tree biology, safety practices, and risk management. This guide mirrors the exam’s structure – allocating questions by topic weightings and providing clear answer breakdowns – so you can focus your study where it matters most.

Deluxe

This edition doubles your practice opportunities with two 200-question exams (400 questions total), each accompanied by thorough answer rationales. It also includes the full topic outline to guide your review and ensure realistic, exam-style preparation.

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Standard

You’ll receive a complete outline of every ISA exam domain paired with one 200-question practice test and detailed explanations for each answer. This edition focuses on building confidence through targeted practice on key topics.

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Practice Questions

Question 1

The ideal soil ratio for solids to pore space is:

(A) 20:80

(B) 35:65

(D) 50:50

(D) An even split between the amount of solids and the amount of pore space is the ideal condition.

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Question 3

The removal of an excessive amount of inner lateral branches causing a poor distribution of foliage is?

(A) Lion Tailing

(B) Crown Reduction

(D) Espalier

(A) Lion tailing occurs when too many inner laterals are removed and there's no longer an appropriate distribution. This can lead to bark sunburn, breakage, and waterspouts

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Question 2

Healthy fonds on palm trees shall not be removed if possible if they are less than what angle to the stem?

(A) 45°

(B) 90°

(D) 180°

(B) If possible healthy, older fonds should not be removed. If they must be, fonds that are at an angle of less than 90° perpendicular to the stem shall not be removed.

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Question 4

Water movement within the tree between different aged cells is what type of transport?

(A) Axial

(B) Longitudinal

(D) Radial

(D) Water that moves between cells of different ages is called radial transport.

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ISA Certified Arborist Prep Overview

Our ISA Certified Arborist guide equips you with practice exams, clear answer explanations, and focused study tools to help you excel on exam day:

200-page guide that dissects every topic in the ISA content outline, from pruning and soil management to tree risk assessment and urban forestry
Two full-length practice exams (200 questions each) matching the exam’s structure and difficulty, with detailed explanations for every answer
Topic-proportional question distribution that mirrors actual exam percentages for realistic practice
Glossary of essential arborist terms for instant clarity
Quick-reference section highlighting key formulas, safety standards, and definitions for last-minute review

Available in Standard and Deluxe editions, this guide is your all-in-one resource for efficient, targeted exam prep and lasting career success.