Quiz about Lesson 6: Food Webs and Trophic Pyramids

Question 1

What is a food web?

Accepted Answer

A model of the feeding relationships between populations in an ecosystem

Answer

A type of consumer that recycles nutrients

Answer

A graphical representation of water flow

Answer

A single pathway of feeding relationships

Question 2

What role do decomposers play in an ecosystem?

Accepted Answer

They get their energy by consuming wastes or remains of other organisms

Answer

They produce their own food through photosynthesis

Answer

They consume living plants and animals

Answer

They are the primary consumers in a food chain

Question 3

How does biomass move in a food web?

Accepted Answer

Only a fraction is available to each level of consumer

Answer

It remains constant throughout the food web

Answer

It increases as it moves up the food chain

Answer

It is only found at the base of the food web

Question 4

What do trophic pyramids show?

Accepted Answer

How the energy available decreases through different levels

Answer

The number of organisms at each level of a food web

Answer

The size of each organism in a food chain

Answer

The types of food each organism eats

Question 5

How can scientists use trophic pyramids to restore an ecosystem?

Accepted Answer

By modifying solutions after testing based on trophic relationships

Answer

By introducing new species at the top of the pyramid

Answer

By increasing the biomass at each level of the food chain

Answer

By removing all decomposers from the ecosystem

Question 6

What is the main difference between a food chain and a food web?

Accepted Answer

A food web is made up of many food chains

Answer

A food web consists of only one pathway of feeding relationships

Answer

A food chain is a model of feeding relationships between populations

Answer

A food chain includes decomposers, while a food web does not

Question 7

Why is only a fraction of biomass available to each level of consumer in a food chain?

Accepted Answer

Because most of it is used for the organism's life processes

Answer

Because decomposers consume the majority of the biomass

Answer

Because biomass is not an important factor in food chains

Answer

Because consumers are not efficient in absorbing biomass

Question 8

What happens to energy as it is transferred through different levels of a food web?

Accepted Answer

It decreases as it is transferred through different levels

Answer

It remains constant throughout the food web

Answer

It is completely recycled by decomposers

Answer

It increases with each level

Question 9

Why are decomposers considered a special kind of consumer?

Accepted Answer

Because they consume the wastes or remains of other organisms

Answer

Because they only consume primary producers

Answer

Because they are the largest organisms in an ecosystem

Answer

Because they can produce their own food

Question 10

What is biomass?

Accepted Answer

The total mass of living matter within a given unit of environmental area

Answer

A type of decomposer

Answer

The energy produced by primary consumers

Answer

The amount of water in an ecosystem

Question 11

How do scientists modify solutions to restore an ecosystem?

Accepted Answer

By using understanding of trophic relationships and modifying solutions after testing

Answer

By adding more consumers to the ecosystem

Answer

By using only trophic pyramids

Answer

By testing and not making any changes

Question 12

What is the role of energy in food webs?

Accepted Answer

It decreases as it moves through trophic levels

Answer

It is only important for primary producers

Answer

It increases as it moves up the trophic levels

Answer

It is not transferred between organisms

Question 13

Why is it important to understand food webs?

Accepted Answer

To restore ecosystems

Answer

To increase biomass production

Answer

To design video games

Answer

To predict weather patterns

Question 14

What is the significance of trophic pyramids in an ecosystem?

Accepted Answer

They display the energy flow and trophic levels

Answer

They list all the species in an ecosystem

Answer

They show the physical structure of the ecosystem

Answer

They indicate the health of the ecosystem

Question 15

How do decomposers contribute to the nutrient cycle?

Accepted Answer

By recycling nutrients back into the ecosystem

Answer

By increasing the energy available at each trophic level

Answer

By consuming live plants and animals

Answer

By producing their own food

Question 16

Which organisms are primarily responsible for the process of photosynthesis in an ecosystem?

Accepted Answer

Primary producers

Answer

Decomposers

Answer

Primary consumers

Answer

Secondary consumers

Question 17

What is the primary role of herbivores in a food web?

Accepted Answer

To consume primary producers

Answer

To recycle nutrients back into the soil

Answer

To serve as prey for higher trophic levels

Answer

To produce their own food through photosynthesis

Question 18

Why is biodiversity important for the stability of an ecosystem?

Accepted Answer

It provides resilience against environmental changes and disturbances

Answer

It ensures that energy flow remains constant at all trophic levels

Answer

It increases the dependency of one species on another, making the food web simpler

Answer

It allows for a greater accumulation of biomass at the top of the trophic pyramid

Question 19

How does chlorophyll contribute to the process of photosynthesis?

Accepted Answer

Chlorophyll absorbs light energy and converts it into chemical energy.

Answer

Chlorophyll absorbs water and nutrients from the soil

Answer

Chlorophyll breaks down carbon dioxide into glucose

Answer

Chlorophyll releases oxygen into the atmosphere

Question 20

Which organism would be found at the first trophic level?

Accepted Answer

grass

Answer

lions

Answer

vultures

Answer

antelopes

Question 21

What is the difference between food chains and food webs?

Accepted Answer

Food web show multiple energy pathways, while food chains show only one energy pathway

Answer

Food chains show a single energy pathways, while food webs show several energy pathways

Question 22

If only 10% of an organism's energy is available for the next trophic level, what happens with the other 90% of the energy?

Accepted Answer

It is used for life processes or lost as body heat.

Answer

It is destroyed after it is used up.

Answer

It remains for the next trophic level IF the predator consumes ALL of the organism.

Answer

It is lost completely as body heat.

Question 23

What makes an energy pyramid different than a food web or chain?

Accepted Answer

It shows the amount of energy in each trophic level

Answer

It shows energy flowing from the top of the chain and downward.

Answer

The tropic levels are the opposite

Answer

It shows specific predator/prey relationships

Question 24

What is biomass?

Accepted Answer

the total dry weight of organisms in an ecosystem

Answer

the total volume of organisms in an ecosystem

Answer

the total dry weight of producers in an ecosystem

Answer

the total volume of animals in an ecosystem

Lesson 6: Food Webs and Trophic Pyramids

24 questions

What is a food web?

What role do decomposers play in an ecosystem?

How does biomass move in a food web?

What do trophic pyramids show?

How can scientists use trophic pyramids to restore an ecosystem?

What is the main difference between a food chain and a food web?

Why is only a fraction of biomass available to each level of consumer in a food chain?

What happens to energy as it is transferred through different levels of a food web?

Why are decomposers considered a special kind of consumer?

What is biomass?

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