ISA Certified Arborist UPDATED Exam Questions and CORRECT Answers
guard cells - Pair of specialized cells that regulate the opening and closing of stomate due to the change in water pressure within cells. Functions of root system - Absorb and conduct water and minerals, anchor and support plant, storage of extra food and produce hormones. Tropism - Tendency of growth or variation of a plant in response to an external stimulus such as gravity or light. Geotropism - plant growth produced as a response to the force of gravity, either positive, as in the direction of gravity (roots), or negative, as in opposite the direction of gravity (shoots) Phototropism - Influence of light on the direction of plant growth. Tendency of plants to grow toward ligh
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