Certified Arborist Practice Test 2025 – The Comprehensive All-In-One Guide to Exam Success!

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What types of plants are known to cause severe skin rashes?

Poison ivy, poison sumac, poison oak

Poison ivy, poison sumac, and poison oak are well-known plants that can cause severe skin rashes due to the presence of an oil called urushiol. This oil is highly irritating to the skin and can lead to allergic reactions characterized by red, itchy, and blistering rashes upon contact. Each of these plants contains urushiol in their leaves, stems, and roots, making them particularly hazardous in outdoor environments.

Understanding these specific plants is crucial for avoiding exposure during activities such as hiking or gardening, where contact may occur. The other options include plants that may cause discomfort or have thorns, but they do not produce the same level of widespread, severe allergic reactions that urushiol does. This distinction emphasizes the importance of recognizing the specific plants responsible for severe skin irritation in order to prevent encounters with them.

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Thorns and nettles

Cacti and brambles

Allergic shrubs

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