AP Environmental Science Practice Quiz: Irrigation Methods

Correct Answer: C

The text explicitly states, 'The largest human use of freshwater is for irrigation (70%).'

Correct Answer: B

The content defines waterlogging as a condition that 'occurs when too much water is left to sit in the soil, raising the water table and inhibiting plants’ ability to absorb oxygen through their roots.'

Correct Answer: D

The text states that drip irrigation is the most efficient method, with only about 5% water loss, making it the best choice for water conservation.

Correct Answer: C

The content specifies that with furrow irrigation, 'about 1/3 of the water is lost to evaporation and runoff,' which is a major drawback.

Correct Answer: C

The text defines salinization as a process that 'occurs when salts remain in the soil after water evaporates, which can eventually make soil toxic to plants.'

Correct Answer: B

The text states that spray irrigation is 'more efficient than flood and furrow irrigation' but is also 'more expensive and requires energy.'

Correct Answer: B

The content provides the Ogallala Aquifer as a specific example of how aquifers 'can be severely depleted if overused for agricultural irrigation.'

Correct Answer: C

The text directly links flood irrigation with losing 'about 20% of water to evaporation and runoff' and notes that it 'can lead to waterlogging of the soil.'

Correct Answer: C

While other methods have drawbacks, spray irrigation presents a dual challenge in this scenario. It is expensive and, critically, 'requires energy,' which is a stated constraint (high energy costs). The limited water also makes less efficient methods like furrow and flood poor choices, but spray directly hits both constraints mentioned.

Correct Answer: C

The text clearly states that drip irrigation 'is expensive and not often used,' identifying cost as the main barrier to its adoption.

Correct Answer: A

Based on the water loss percentages given: Drip (5%) is most efficient. Spray (1/4 or 25% or less) is next. Flood (20%) is less efficient than spray in some cases but more than furrow. Furrow (1/3 or ~33%) is the least efficient. The correct order is Drip, Spray, Flood, Furrow.

Correct Answer: C

The description of a 'white, crusty layer' on the soil matches the process of salinization, where salts are left behind after water evaporates. This can make the soil toxic to plants, explaining the declining yields.

Correct Answer: B

The text identifies furrow irrigation as 'inexpensive' with about 1/3 water loss. Flood irrigation is also a traditional, less costly method that loses about 20% of its water. In contrast, drip and spray are noted for being more expensive.

Correct Answer: D

The text explicitly states that spray irrigation 'requires energy,' distinguishing it from gravity-fed methods like flood and furrow irrigation.

Correct Answer: B

Switching from furrow (inexpensive, ~33% water loss) to drip (expensive, ~5% water loss) would result in a significant decrease in water usage but a significant increase in the initial financial investment.

Correct Answer: C

The text defines salinization as what 'occurs when salts remain in the soil after water evaporates.' The other options incorrectly swap the definitions or causes of waterlogging, salinization, and aquifer depletion.