1.What is a watershed?

An area that drains water to a common location

Discharging untreated wastewater into the river

A decrease in the biodiversity of marine ecosystems.

3. What happens when coral reefs experience bleaching?

Coral loses its algae, which harms its ability to survive

15. Why is porosity important in an aquifer?

It determines how much water can be stored

5. Why are invasive species a threat to ocean ecosystems?

They outcompete native species for resources

An algae bloom that leads to a dead zone in the ocean

3. What is surface water?

Water in rivers, lakes, and ponds

9. What happens to marine life in a dead zone?

It struggles to survive due to low oxygen levels

Imposing stricter fishing regulations, such as limiting the number of fishi

5. What best describes an aquifer?

An underground layer that holds groundwater

7. What is permeability?

How easily water flows through soil or rock

1.Which of the following is not a way humans depend on oceans?

Filtering groundwater through aquifers

An increase in the water temperature due to climate change.

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Watersheds 7.11.A/B 2025

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Questions 27

Answers

1
1.What is a watershed?
A body of water
A type of aquifer
A groundwater source
An area that drains water to a common location
2
9. What process allows water to move down through soil to reach an aquifer?
Condensation
Filtration
Percolation
Evaporation
3
10
Implementing a global ban on single-use plastics.
Improving waste management and recycling infrastructure worldwide.
Educating the public about the dangers of plastic pollution and promoting r
All of the above.
4
11
Emitting smoke into the atmosphere
Discharging untreated wastewater into the river
Expanding nearby urban development
Increasing transportation of goods by trucks
5
11. Which human activity can lower the water table?
Using wells excessively
Planting trees
Reducing runoff
Building dams
6
2
An increase in the number of predatory fish in the ocean.
A decrease in the biodiversity of marine ecosystems.
A decrease in the amount of oxygen available for marine organisms.
An increase in the amount of carbon dioxide absorbed by the ocean.
7
3. What happens when coral reefs experience bleaching?
Coral grows faster, supporting more marine life
Coral loses its algae, which harms its ability to survive
Coral becomes resistant to ocean acidification
Coral absorbs more carbon dioxide from the atmosphere
8
14. Which process refills groundwater by soaking water into soil?
Percolation
Transpiration
Runoff
Evaporation
9
7. How does plastic waste most commonly enter ocean systems?
Illegal dumping by ships
Runoff from land-based sources
Accidental leaks from underwater pipelines
Intentional disposal by coastal industries
10
15. Why is porosity important in an aquifer?
It creates water pressure
It increases runoff
It determines how much water can be stored
It prevents water flow
11
13. What happens if an aquifer recharge rate is too low?
More surface water appears
The aquifer runs out of water
Drainage divides form
The water table rises
12
12. What feature defines the boundaries of a watershed?
Recharge zones
Aquifers
Water table
Divides
13
5. Why are invasive species a threat to ocean ecosystems?
They outcompete native species for resources
They increase biodiversity in ecosystems
They introduce harmful bacteria to humans
They are larger and more aggressive than native species
14
12
Decreased levels of nutrients in the soil
Increased fish populations in the river and ocean
An algae bloom that leads to a dead zone in the ocean
Cleaner water due to natural filtration by plants
15
8. What type of aquifer is sandwiched between two impermeable layers?
Recharge zone
Surface aquifer
Confined aquifer
Unconfined aquifer
16
3. What is surface water?
Water in confined aquifers
Water found underground
Water stored in aquifers
Water in rivers, lakes, and ponds
17
6. Which term describes how much space is available in rock or soil to hold water?
Runoff
Percolation
Permeability
Porosity
18
10. What is the water table?
A source of surface water
The top of groundwater in soil
A type of aquifer
The boundary between watersheds
19
9. What happens to marine life in a dead zone?
It becomes overpopulated due to excess nutrients
It adapts to higher temperatures and pollution
It struggles to survive due to low oxygen levels
It thrives because of reduced competition
20
6
Investing in larger fishing boats and more advanced fishing technology to i
Imposing stricter fishing regulations, such as limiting the number of fishi
Moving the fishing operations further offshore to areas with less pollution
Encouraging the development of coastal tourism to diversify the local econo
21
5. What best describes an aquifer?
An underground layer that holds groundwater
A river system
The top level of soil moisture
A watershed that drains water
22
7. What is permeability?
How easily water flows through soil or rock
The water table depth
The total amount of surface water
How fast water evaporates
23
1.Which of the following is not a way humans depend on oceans?
Filtering groundwater through aquifers
Storing large amounts of carbon dioxide
Serving as a transportation route for goods
Providing oxygen through phytoplankton
24
4. Where is groundwater stored?
In rivers and lakes
On the surface in ponds
In aquifers underground
In the ocean
25
2. What divides different watersheds?
Percolation zones
Soil layers
Drainage divides
Aquifers
26
4
An increase in the competition for resources among marine species.
An increase in the number of invasive species in new areas.
A decrease in the number of commercial fishing opportunities in some region
All of the above.
27
8
An increase in the number of predatory fish in the area.
An increase in the water temperature due to climate change.
A decrease in the availability of nutrients for the coral.
A decrease in the salinity of the water due to increased rainfall.

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