9. what type of organisms are usually the primary producers at hydrothermal vents?
a) algae
b) bacteria that use chemicals like hydrogen sulfide
c) seaweed
d) phytoplankton
10. hydrothermal vents release mineral - rich water that can appear as:
a) black smokers and white smokers
b) crystal geysers
c) muddy rivers
d) hot waterfalls
short answer section
part a: the water cycle
1. explain how transpiration contributes to the water cycle.
2. describe the difference between runoff and infiltration.
3. why is the sun considered the main driver of the water cycle?
part b: the hydrosphere
4. define the term hydrosphere in your own words.
5. why is only a small fraction of earths water usable for drinking?
6. name two ways humans impact the hydrosphere.
part c: hydrothermal vents
7. how do hydrothermal vents form on the ocean floor?
8. explain why organisms at hydrothermal vents do not rely on sunlight.
9. what role do chemosynthetic bacteria play in vent ecosystems?
10. give one example of an adaptation an organism might have to survive near hydrothermal vents.

Question

Accepted Answer

### 9.
# Brief Explanations:
Hydrothermal vents are in dark - deep - sea environments. Bacteria that use chemicals like hydrogen sulfide for chemosynthesis are the primary producers as they can create organic matter without sunlight. Algae, seaweed, and phytoplankton rely on photosynthesis which requires sunlight.
# Answer:
b) Bacteria that use chemicals like hydrogen sulfide

### 10.
# Brief Explanations:
Hydrothermal vents release mineral - rich water. Black smokers are hot vents that emit dark - colored minerals and white smokers are cooler vents with lighter - colored minerals. Crystal geysers, muddy rivers, and hot waterfalls are not the typical forms of mineral - rich water release from hydrothermal vents.
# Answer:
a) Black smokers and white smokers

### Part A - 1.
# Brief Explanations:
Transpiration is the process by which plants release water vapor into the atmosphere. This water vapor then condenses and can form clouds, contributing to precipitation which is part of the water cycle.
# Answer:
Plants release water vapor through transpiration. This vapor condenses, forms clouds and contributes to precipitation in the water cycle.

### Part A - 2.
# Brief Explanations:
Runoff is water that flows over the land surface, like rainwater flowing into rivers. Infiltration is the process by which water seeps into the soil. One is surface - flow and the other is soil - entry of water.
# Answer:
Runoff is surface water flow. Infiltration is water seeping into soil.

### Part A - 3.
# Brief Explanations:
The sun provides the energy for evaporation. Evaporation turns liquid water into water vapor which then goes through the rest of the water - cycle processes like condensation and precipitation.
# Answer:
The sun provides energy for evaporation, starting the water - cycle processes.

### Part B - 4.
# Brief Explanations:
The hydrosphere encompasses all the water on Earth, including in oceans, rivers, lakes, groundwater, and in the atmosphere in the form of water vapor.
# Answer:
The hydrosphere is all the water on Earth in various forms and locations.

### Part B - 5.
# Brief Explanations:
Most of Earth's water is in the oceans and is salty. A large portion of the freshwater is locked in glaciers and ice caps. Only a small fraction is accessible and suitable for drinking.
# Answer:
Most water is salty ocean water or locked in glaciers/ice caps, leaving little for drinking.

### Part B - 6.
# Brief Explanations:
Humans can pollute water sources with chemicals, waste, etc. They also withdraw large amounts of water for various uses like agriculture and industry, affecting the hydrosphere.
# Answer:
Polluting water sources and excessive water - withdrawal.

### Part C - 7.
# Brief Explanations:
Hydrothermal vents form when seawater seeps into cracks in the ocean floor, gets heated by magma, and then rises back up, releasing minerals on the way.
# Answer:
Seawater seeps into ocean - floor cracks, heats up from magma and rises, forming vents.

### Part C - 8.
# Brief Explanations:
Hydrothermal vents are in deep - sea, dark environments. Organisms here rely on chemosynthesis using chemicals like hydrogen sulfide instead of photosynthesis which requires sunlight.
# Answer:
They are in dark deep - sea; organisms use chemosynthesis instead of photosynthesis.

### Part C - 9.
# Brief Explanations:
Chemosynthetic bacteria use chemicals like hydrogen sulfide to produce organic matter through chemosynthesis. This forms the base of the vent ecosystem food - web, providing energy for other organisms.
# Answer:
They are primary producers, creating organic matter for the vent ecosystem food - web.

### Part C - 10.
# Brief Explanations:
Some organisms near hydrothermal vents have heat - resistant enzymes to survive the high - temperature environment around the vents.
# Answer:
Heat - resistant enzymes to tolerate high temperatures.

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QUESTION IMAGE

Question

Explanation:

9.

Answer:

10.