Aquatic Ecosystems EOC

What are the physical or nonliving components of an ecosystem called?

• Abiotic factors

• Antibiotic Factors

• Biotic factors

• Temperature conditions

Tags

NGSS.MS-LS2-3

Why are there so few aquatic plants and phytoplankton that live at the bottom zones in the ocean?

• The ocean floor contains many decomposers.

• Most sunlight is absorbed before reaching these levels.

• Water is a limiting factor.

• The temperature in these zones is extremely low.

Tags

NGSS.MS-LS2-3

Recent heavy rain storms have caused the sediment in Lake Okeechobee to become suspended in the water. The effect of suspended sediment particles in the water will cause a decrease in the amount of light that can penetrate to the bottom of the lake. Sediment particles, being dark in color, readily absorb the sun’s heat energy. Which of the following is the result of sediment suspension?

• There will be an increase in the fish population

• There will be an increase in salinity

• There will be a decrease in temperature

• There will be a decrease in plant growth

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

NGSS.MS-LS2-4

The table below shows research on aquatic zones and living organisms

Characteristics of Aquatic Zones:

-Intertidal: Air, sun and water exposure; crashing waves

-Neritic: Water depth less than 200 m; lots of sunlight; warm water

-Benthic: Very deep water; no light; cold water except near thermal vents that emit heat and chemicals

Based on the observations, which conclusion could you draw?

• Organisms in the intertidal zone must be able to withstand very cold water

• There are no producers in the benthic zone that rely on photosynthesis

• Organisms in the benthic zone must be able to tolerate large amounts of oxygen

• The warm water and abundant sunlight in the neritic zone limits the plankton population

Tags

NGSS.MS-LS1-5

In aquatic ecosystems, phytoplankton and other photosynthetic organisms appear in the upper layer of the water, but not deeper layers. Which statement explains this distribution?

• The deeper layers are too dark for photosynthesis to occur

• The deeper layers are too cold for photosynthesis to occur

• The deeper layers have too little oxygen for photosynthetic organisms to survive

• The deeper layers have too much carbon dioxide for photosynthetic organisms to survive

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Salinity refers to ...

• How many plants are in the water

• The temperature of the water

• The pH of the water

• The amount of salt that is in the water

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

All are freshwater ecosystems except

• Marshes

• Lakes

• Rivers

• Estuaries

An area in which fresh water from a river mixes with salt water from the ocean

• Wetland

• Lake

• Estuary

• Marshes

What is at the base of the food chain in the ocean?

• Whales

• Plankton

• Turtles

• Fish

How do ecologists classify aquatic ecosystems?

• Salinity

• Movement

• Depth

• All of the above