LSU ENVS 1126 Exam 3
Which of the following is more related to water quality than water quantity? - ANS-Sewage
treatment facilities
The decline of the polar ice caps because of increasing temperatures at the poles will -
ANS-decrease the largest reserve of freshwater on Earth.
Which of the following contributes the most as a greenhouse gas? - ANS-Water vapor levels in
the air
The current "mega drought" in the American Southwest may impact agriculture by - ANS-forcing
growers to shift from water-intensive crops like almonds to those that need less water
Which of the following is not an example of gray water - ANS-water from a toilet
Stewardship of water resources includes - ANS-the need for safe drinking water for developing
societies.
The greatest threats to groundwater supplies are - ANS-groundwater pollution and depletion.
When freshwater inflows into estuaries are reduced - ANS-salt water intrudes into the system.
A zookeeper arrives at work and begins her day by filling up the coffeemaker with tap water.
Washing some vegetables off in a sink, she prepares meals for the monkeys. Later in the day,
she washes down the animals' enclosures into the zoo's sewage system and sprinkles the water
onto plants growing in a nearby garden. What did the zookeeper do that represents a
consumptive use of water? - ANS-Using water for the garden
What happens when humans change the Earth's surface by clearing forests or overgrazing
land? - ANS-Water no longer infiltrates, but runs off the land, Flooding increases, Sedimentation
of rivers increases, All of these occur as a result of changes to Earth's surface.
Kim et al. (2020) stated in her research paper: "In developing countries, most households
transport water from distant sources, placing physical burdens on women and children, who
commonly carry water on their heads. A lightweight backpack was developed to alleviate
physical stress from water carriage and provide a safe storage container." If the backpack can
contain up to 10 500-ml water bottles, what is its maximum weight limit? Assume that the
density of water is 1 g cm-3 . - ANS-5 kg
Based on soil particle size, the largest to smallest soil types are - ANS-sand, silt, and clay
, A soil that is found to have 50% sand, 30% silt, and 20% clay would be referred to as -
ANS-loamy
Detritus feeders and decomposers are most likely found in the - ANS-A and O Horizon
The most water can be held within a soil mixture consisting of equal masses of which soil types?
- ANS-Silt and Clay
Soils with the greatest water-holding capacity tend to have - ANS-poor aeration and the lowest
workability.
A hydric soil is one that - ANS-is typical of wetlands and may contain peat
Which of the following can best be classified as "soil constraints"? - ANS-Poor drainage, salinity,
and high levels of aluminum
Farmers often appreciate a long, light rain over many hours after a long drought, instead of a
sudden downpour. This is because a long, light rain permits better - ANS-infiltration
In which of the following agricultural situations are fertilizers least needed? - ANS-A natural
prairie pasture where cattle feed and defecate
Walking along the woods, a student spot a lizard that quickly runs under some leaves that are
resting on the forest floor. Looking under the leaves to find the lizard, he notices that the soil is
very moist despite several days without rain. This moist soil layer under the leaves is a result of
- ANS-humus with a high water-holding capacity and reduced evaporative loss in the O horizon
Adding humus in a garden will most likely - ANS-increase the nutrients of the soil and the
water-holding capacity
The soil structure resulting from the castings of earthworms - ANS-improves the infiltration and
aeration of soil.
The greatest cause of topsoil loss around the world is - ANS-erosion
It has become clear that sustaining soil productivity is directly related to which of the global
sustainable development goals (SDG)? - ANS-Food security
Children learning the process of good home gardening decide to help as best they can. Every
day they walk along rows of bean plants, carefully inspecting each plant for insect and removing
any that they find. However, the bean plants do not grow well and few beans form. Their parents
notice the beans, inspect the plants and soil, and tell the children that walking around the plants
every day has hurt the plants by - ANS-compacting the soil, decreasing aeration and infiltration.
Which of the following is more related to water quality than water quantity? - ANS-Sewage
treatment facilities
The decline of the polar ice caps because of increasing temperatures at the poles will -
ANS-decrease the largest reserve of freshwater on Earth.
Which of the following contributes the most as a greenhouse gas? - ANS-Water vapor levels in
the air
The current "mega drought" in the American Southwest may impact agriculture by - ANS-forcing
growers to shift from water-intensive crops like almonds to those that need less water
Which of the following is not an example of gray water - ANS-water from a toilet
Stewardship of water resources includes - ANS-the need for safe drinking water for developing
societies.
The greatest threats to groundwater supplies are - ANS-groundwater pollution and depletion.
When freshwater inflows into estuaries are reduced - ANS-salt water intrudes into the system.
A zookeeper arrives at work and begins her day by filling up the coffeemaker with tap water.
Washing some vegetables off in a sink, she prepares meals for the monkeys. Later in the day,
she washes down the animals' enclosures into the zoo's sewage system and sprinkles the water
onto plants growing in a nearby garden. What did the zookeeper do that represents a
consumptive use of water? - ANS-Using water for the garden
What happens when humans change the Earth's surface by clearing forests or overgrazing
land? - ANS-Water no longer infiltrates, but runs off the land, Flooding increases, Sedimentation
of rivers increases, All of these occur as a result of changes to Earth's surface.
Kim et al. (2020) stated in her research paper: "In developing countries, most households
transport water from distant sources, placing physical burdens on women and children, who
commonly carry water on their heads. A lightweight backpack was developed to alleviate
physical stress from water carriage and provide a safe storage container." If the backpack can
contain up to 10 500-ml water bottles, what is its maximum weight limit? Assume that the
density of water is 1 g cm-3 . - ANS-5 kg
Based on soil particle size, the largest to smallest soil types are - ANS-sand, silt, and clay
, A soil that is found to have 50% sand, 30% silt, and 20% clay would be referred to as -
ANS-loamy
Detritus feeders and decomposers are most likely found in the - ANS-A and O Horizon
The most water can be held within a soil mixture consisting of equal masses of which soil types?
- ANS-Silt and Clay
Soils with the greatest water-holding capacity tend to have - ANS-poor aeration and the lowest
workability.
A hydric soil is one that - ANS-is typical of wetlands and may contain peat
Which of the following can best be classified as "soil constraints"? - ANS-Poor drainage, salinity,
and high levels of aluminum
Farmers often appreciate a long, light rain over many hours after a long drought, instead of a
sudden downpour. This is because a long, light rain permits better - ANS-infiltration
In which of the following agricultural situations are fertilizers least needed? - ANS-A natural
prairie pasture where cattle feed and defecate
Walking along the woods, a student spot a lizard that quickly runs under some leaves that are
resting on the forest floor. Looking under the leaves to find the lizard, he notices that the soil is
very moist despite several days without rain. This moist soil layer under the leaves is a result of
- ANS-humus with a high water-holding capacity and reduced evaporative loss in the O horizon
Adding humus in a garden will most likely - ANS-increase the nutrients of the soil and the
water-holding capacity
The soil structure resulting from the castings of earthworms - ANS-improves the infiltration and
aeration of soil.
The greatest cause of topsoil loss around the world is - ANS-erosion
It has become clear that sustaining soil productivity is directly related to which of the global
sustainable development goals (SDG)? - ANS-Food security
Children learning the process of good home gardening decide to help as best they can. Every
day they walk along rows of bean plants, carefully inspecting each plant for insect and removing
any that they find. However, the bean plants do not grow well and few beans form. Their parents
notice the beans, inspect the plants and soil, and tell the children that walking around the plants
every day has hurt the plants by - ANS-compacting the soil, decreasing aeration and infiltration.
