Energy Flow Practice - District Test 2

A food web diagram is provided. Refer to the food web diagram. Which of the following organisms depend only on producers for energy?

• Diatoms

• Shrimp

• Amphipods

• Squid

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

Matter is passed from the LIVING/biotic part of an ecosystem to the NON-LIVING/abiotic part when which of the following takes place?

• Plants absorb gases

• Plants decompose

• Animals eat plants

• Animals drink water

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

The energy organisms need to live and grow first enters the ecosystem when—

• plants take in light energy from the sun.

• decomposers break down dead organisms.

• primary consumers eat plants for food.

• secondary consumers eat primary consumers.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

A food web diagram is provided. Which of the following is a correct sequence according to the food web?

• Sun → grass → robin

• Plant seeds → field mouse → robin

• Eagle → deer → plant seeds

• Grass → deer → mountain lion

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-3

Which of the following observations would support the claim that as plants absorb sunlight to make food, they release oxygen into the environment?

• Oxygen concentration in the atmosphere was much higher millions of years ago when different plants existed.

• When plants are kept in a sealed environment, the concentration of carbon dioxide steadily goes down.

• Plants that are kept under conditions of total darkness fail to grow normally and eventually will die.

• The oxygen concentration in a pond with many plants increases during the day and decreases at night and on cloudy days.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

What is the energy source for producers, consumers, and decomposers?

Answer explanation

District Answer: Producers absorb the Sun’s radiant energy and use it to create their own food. Consumers eat either producers or other consumers to get the energy they need to function. Decomposers break down dead organic material and absorb the energy from it.

KEY IDEA: sun's energy is the starting point which is passed to the plant, the herbivore that eats the plant and all the way down the line. Some of the energy though is used in body processes, so only 10 % is passed on.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

A diagram is provided. Identify an energy path starting with a producer and ending with bacteria or fungi recycling the nutrients from dead plant or animal matter back to the soil of the environment.

Answer explanation

Grasses (producer) → Mouse (first-level consumer) → Mongoose (third-level consumer) → Hyena (fourth-level consumer)

-> Bacteria (decomposer)

Tags

NGSS.MS-LS2-3

Considering the energy flow in an ecosystem, which of the following best describes the role of decomposers?

• They convert solar energy into chemical energy.

• They consume primary consumers to obtain energy.

• They break down dead organisms, releasing nutrients back into the ecosystem.

• They produce oxygen through the process of photosynthesis.

Tags

NGSS.MS-LS2-3

In a terrestrial ecosystem, which of the following sequences correctly represents the flow of energy?

• Sun → Herbivores → Carnivores → Decomposers

• Sun → Producers → Primary Consumers → Secondary Consumers

• Producers → Sun → Primary Consumers → Secondary Consumers

• Decomposers → Producers → Primary Consumers → Secondary Consumers

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which of the following processes is primarily responsible for the oxygen that animals breathe?

• The decomposition of organic matter by bacteria

• The evaporation of water from oceans and lakes

• The photosynthesis process in plants and algae

• The respiration process in animals and plants

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3