Which of the following best explains why energy transfer in a food web is described as a pyramid?(1 point)..

Question

Responses

Energy is lost at each trophic level, with less energy available to organisms higher up in the pyramid.
Energy is lost at each trophic level, with less energy available to organisms higher up in the pyramid.

There are more producers than consumers in an ecosystem.
There are more producers than consumers in an ecosystem.

Tertiary consumers receive the most energy in an ecosystem.
Tertiary consumers receive the most energy in an ecosystem.

The shape of the pyramid represents the physical structure of ecosystems.

Answer 1

The best explanation for why energy transfer in a food web is described as a pyramid is:

Energy is lost at each trophic level, with less energy available to organisms higher up in the pyramid.

This reflects the concept that as energy moves up the food chain, typically only about 10% of the energy is passed on to the next trophic level, leading to fewer organisms and less energy available at higher levels.

Answer 2

Answer the following questions based on pages 4-5 (the Food Web Organizer & the Freshwater Ecosystem Food Web) and the information you have learned in this unit.


Which of the following is a type of fungus that acts as a decomposer?

(1 point)
Responses

Phytoplankton
Phytoplankton

Yeast
Yeast

Cory Catfish
Cory Catfish

Alligator
Alligator
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Answer 3

The type of fungus that acts as a decomposer is:

Yeast.

Yeast is a type of fungus that breaks down organic matter, playing a crucial role in decomposition within ecosystems. Phytoplankton are photosynthetic organisms, Cory Catfish are fish, and alligators are reptiles, none of which are decomposers.

Answer 4

What percentage of energy from the sun do producers in a freshwater ecosystem get?(1 point)
Responses

1%
1%

10%
10%

100%
100%

0.1%

Answer 5

Producers in a freshwater ecosystem typically receive about 1% of the energy from the sun. This is a general estimate for the amount of solar energy that is converted into chemical energy through photosynthesis by producers, such as plants and phytoplankton.

Answer 6

Which of the following is a primary consumer in a freshwater ecosystem?(1 point)
Responses

Zooplankton
Zooplankton

Duckweed
Duckweed

Dragonflies
Dragonflies

Alligators

Answer 7

The primary consumer in a freshwater ecosystem is:

Zooplankton.

Zooplankton feed on phytoplankton (the producers) and are classified as primary consumers. Duckweed is a producer, dragonflies are typically predators (secondary consumers), and alligators are higher-level consumers.

Answer 8

How much energy from the sun do secondary consumers capture in a freshwater ecosystem?(1 point)
Responses

0.1%
0.1%

1%
1%

10%
10%

100%

Answer 9

Secondary consumers in a freshwater ecosystem typically capture about 0.1% of the energy from the sun. This reflects the loss of energy that occurs at each trophic level in the food web.

Answer 10

Which of the following best describes the energy flow from producers to tertiary consumers in a freshwater ecosystem?(1 point)
Responses

Energy flows directly from the sun to tertiary consumers.
Energy flows directly from the sun to tertiary consumers.

Producers get 100% energy from the sun, primary consumers get 10%, secondary consumers get 1%, and tertiary consumers get 0.1%.
Producers get 100% energy from the sun, primary consumers get 10%, secondary consumers get 1%, and tertiary consumers get 0.1%.

Tertiary consumers get the most energy directly from the sun.
Tertiary consumers get the most energy directly from the sun.

Energy is evenly distributed among all trophic levels.

Answer 11

The option that best describes the energy flow from producers to tertiary consumers in a freshwater ecosystem is:

Producers get 100% energy from the sun, primary consumers get 10%, secondary consumers get 1%, and tertiary consumers get 0.1%.

This statement reflects the typical energy transfer efficiency at each trophic level, where energy decreases as it moves up the food chain.