FREE ISA Soil Science and Management Questions and Answers

Question 1

An arborist is assessing a site with heavy clay soil. Which of the following characteristics is most associated with this soil texture?

Accepted Answer

High water-holding capacity and low aeration.

Answer

High water infiltration rate and low nutrient-holding capacity.

Answer

Low water-holding capacity and high aeration.

Answer

Large particle size and rapid drainage.

Question 2

A soil test report for a park's London plane trees indicates a pH of 8.0. This alkaline condition is most likely to cause a deficiency in which of the following micronutrients?

Accepted Answer

Iron and Manganese

Answer

Potassium and Calcium

Answer

Sulfur and Magnesium

Answer

Nitrogen and Phosphorus

Question 3

What is the primary benefit of high Cation Exchange Capacity (CEC) in soil for tree health?

Accepted Answer

It enhances the soil's ability to retain and supply essential nutrient cations.

Answer

It increases the soil's water infiltration rate.

Answer

It improves soil structure by creating larger aggregates.

Answer

It ensures a neutral soil pH.

Question 4

An arborist is working on a newly developed commercial site where heavy equipment has been operating. Which of the following is a direct consequence of soil compaction on the tree root environment?

Accepted Answer

Reduction in soil pore space, limiting oxygen and water availability.

Answer

Increased organic matter decomposition.

Answer

An increase in beneficial mycorrhizal fungi populations.

Answer

Lowering of the soil pH to acidic levels.

Question 5

Which of the following is a key function of organic matter in urban soils?

Accepted Answer

It improves soil structure and provides a slow release of nutrients.

Answer

It raises the soil pH significantly.

Answer

It decreases the soil's water-holding capacity.

Answer

It sterilizes the soil, eliminating all microorganisms.

Question 6

A landscape design specifies planting several trees in an area with sandy soil. To improve the site for better tree establishment, an arborist should primarily focus on amending the soil to:

Accepted Answer

Increase the water and nutrient-holding capacity.

Answer

Increase drainage and aeration.

Answer

Decrease the cation exchange capacity (CEC).

Answer

Raise the soil pH to a highly alkaline level.