Hydrosphere Review #2

1. What type of instrument would scientists use to study the ocean depths?

Drifter

Buoy

Ship

Submersible

Submersible is the only one that could go to the ocean floor.

Explanation

Submersible is the only one that could go to the ocean floor.

2. A river is populated with water beetles, clams and worms. A pollutant is introduced into the river and affects each species differently. The worm population multiplied, the clam population decreased and the beetles disappeared altogether. What kind of species are the beetles?

Facultative

Tolerant

Intolerant

Cannot tell from this info

Since the beetles died out, they are intolerant meaning they were unable to withstand the environment.

Explanation

Since the beetles died out, they are intolerant meaning they were unable to withstand the environment.

3. Alexander compares three water samples. The volume of each sample is 200mL. He measured the temp of each sample and recorded it. Which water sample contains the highest level of Dissolved oxygen (DO)? Water Sample 1: Temp 68 degrees F, source kitchen sink Water sample 2: Temp 35 degrees F, source frozen puddle that just thawed Water sample 3: 50 degrees F, source a stream that sits in the Sun

Sample 1

Sample 2

Sample 3

Temp does not affect oxygen levels

Because sample 1 came from a sink, there are no organisms there to contribute to the DO level. Sample three is going to have a lower DO because it is in the direct sunlight. Sample 2 is the best answer.

Explanation

Because sample 1 came from a sink, there are no organisms there to contribute to the DO level. Sample three is going to have a lower DO because it is in the direct sunlight. Sample 2 is the best answer.

4. How do conditions in the ocean change from the neritic zone to the abyssal plain?

Light and temp decrease; pressure increases

Light, temp and pressure decrease

Light increases; temp and pressure decrease

Light and pressure decrease; temp increases

Sunlight can only reach up to 200 meters deep. Once you pass the point in depth, there is no sunlight, and the temp of the water decreases due to the lack of sunlight. the pressure increases the deeper you go.

Explanation

Sunlight can only reach up to 200 meters deep. Once you pass the point in depth, there is no sunlight, and the temp of the water decreases due to the lack of sunlight. the pressure increases the deeper you go.

5. Which of the following marine ecosystems is not found in the benthic zone of the ocean?

Hydrothermal vents

Submarine hot spring

Coral reef

Estuary

Estuary is where the river meets the ocean.

Explanation

Estuary is where the river meets the ocean.

6. Which of the follwoing accurately compares salt water to fresh water?

Salt water is less dense than fresh water

Salt water is slightly more basic than fresh water

Salt water has a higher freezing point than fresh water

Salt water covers less of Earth's surface than fresh water

Salt water is more dense than fresh, more basic and has lower freezing point than fresh water

Explanation

Salt water is more dense than fresh, more basic and has lower freezing point than fresh water

7. Plants use groundwater by pulling the water up into their roots. What property of water enables plants to do this?

Surface tension

Cohesion

Adhesion

Adhesion and cohesion

the process is started by adhesion, the water being attracted to the roots. Once the water gets inside the roots, it is cohesion that allows the water to move up the plant.

Explanation

the process is started by adhesion, the water being attracted to the roots. Once the water gets inside the roots, it is cohesion that allows the water to move up the plant.