Food chains and food webs

The diagram illustrates organisms that feed on a dead rat, as well as one organism that feeds on those organisms. What is required to complete the food chain?

Feb/March 2016

The diagram illustrates a food web. Which organisms consume the widest range of other organisms, according to this food web?

Feb/March 2016

The diagram displays a pyramid of numbers in a food chain. What type of organism is the hawk?

Feb/March 2016

The diagram illustrates organisms that feed on a dead rat, together with one organism that then feeds on them. What is required to complete the food chain?

Feb/March 2016

Fig. 8.1 presents a section of a food web.

Feb/March 2017

The diagram illustrates part of a food web. Which organisms in the food web are examples of producers, herbivores and carnivores?

Feb/March 2018

Ecologists surveyed a patch of woodland and estimated the biomass at each trophic level for one food chain in that woodland. Some students wished to use these data to sketch a pyramid of biomass for the food chain. Table 3.1 displays the students’ table. The students also added a column so that they could work out the width of the bars they would need to draw.

Feb/March 2018

The food web illustrates the feeding links in a woodland area. If every chaffinch in the food web were to die, what effect would this produce?

Feb/March 2019

In a food chain, energy passes through from one organism to the next. In what form does the energy initially enter the food chain?

Feb/March 2019

The diagram illustrates a pyramid of numbers. Which type of organism is present at level 1?

Feb/March 2020

The diagram illustrates a food chain. grass $\rightarrow$ mouse $\rightarrow$ owl What terms are used to describe the owl’s position in this food chain?

Feb/March 2020

Fig. 6.1 presents a food web.

Feb/March 2021

The diagram illustrates a food web in a rainforest. How many trophic levels are displayed in this food web?

Feb/March 2023

Fig. 5.1 illustrates a food web taken from a desert ecosystem.

Feb/March 2024

The diagram illustrates a food web. At which trophic levels does the leopard feed?

Feb/March 2025

Which organisms may serve as energy sources for decomposers?

Feb/March 2025

The diagram represents a straightforward food chain. green plant $\rightarrow$ herbivore $\rightarrow$ carnivore If a disease reduces the number of herbivores, what effect will this have on the numbers of green plants and carnivores?

May/June 2016

The diagram illustrates a food chain. $ \text{tree} \rightarrow \text{small insects} \rightarrow \text{small birds} \rightarrow \text{birds of prey} $ Which pyramid of numbers is correct for this food chain?

May/June 2016

The diagram illustrates a pyramid of biomass for a food chain in a woodland ecosystem. What is the pyramid of numbers for this food chain?

May/June 2016

The diagram illustrates a biomass pyramid for a food chain in a woodland ecosystem. What is the pyramid of numbers for this food chain?

May/June 2016

In the food chain shown below, the snake population falls to half its original size because of a viral disease. grass $\rightarrow$ locusts $\rightarrow$ snakes $\rightarrow$ eagles How does this affect the other organisms in the food chain?

May/June 2016

The diagram depicts a biomass pyramid for a food chain in a woodland ecosystem. What would the pyramid of numbers be for this food chain?

May/June 2016

Fig. 9.1 presents a diagram of a sustainable fish farm. The diagram labels these features: ducks produce eggs for human consumption; duck house; duck faeces fall into the water and supply nutrients for water plants; fish provide food for village; water is used for ducks to drink and to irrigate crop plants; fish and ducks feed on water plants; crops feed the local population; fruit trees; crop plants.

May/June 2016

The diagram illustrates a food chain in a rock pool. $\text{seaweed} \rightarrow \text{whelks} \rightarrow \text{crabs} \rightarrow \text{seagulls}$ What occurs if the number of secondary consumers rises? The result will be

May/June 2017

The diagram illustrates a food web. Which two organisms in this web are both carnivores?

May/June 2017

The diagram illustrates a section of a food web in a heap of dead leaves. Which terms in the table are used to describe the organisms?

May/June 2017

The diagram shows a section of an aquatic food web. Which organisms act as primary consumers in this food web?

May/June 2017

The diagram illustrates a food chain. apple tree $\rightarrow$ herbivorous insects $\rightarrow$ carnivorous insects $\rightarrow$ bird Which pyramid of numbers matches this food chain?

May/June 2018

The diagram illustrates part of a food web in a rainforest. Within this food web, what trophic level do the anacondas occupy?

May/June 2018

The pyramid of numbers for this food chain is shown. What is the pyramid of biomass for that same food chain?

May/June 2018

The statements in the box show the feeding relationships among four organisms. Hawks gain energy from blackbirds. A fig tree performs photosynthesis. Blackbirds are secondary consumers. Caterpillars feed as herbivores.

May/June 2018

State the meaning of fitness here.

May/June 2018

The diagram illustrates an aquatic food web. Which statement is correct?

May/June 2019

The organisms in a simple food web are labelled H, J, K and L. What must organism H be?

May/June 2019

In this food chain, which organism is the tertiary consumer? aquatic plant $\rightarrow$ pond snails $\rightarrow$ small fish $\rightarrow$ large fish $\rightarrow$ fish eagles

May/June 2019

State the name of the organism in Fig. 8.1 that occurs in the greatest numbers in the pyramid of numbers.

May/June 2019

The diagram illustrates a desert food web. Which organisms shown are all secondary consumers?

May/June 2021

The diagram represents a food web. What is the chief source of energy entering this food web?

May/June 2021

The diagram illustrates a food web. Which statement is right?

May/June 2021

The diagram illustrates the flow of energy through part of a biological system. What belongs in the box labelled 1?

May/June 2021

The diagram illustrates the feeding links in a food web. Which organism may act as both a secondary and a tertiary consumer?

May/June 2021

What type of energy is transferred from one organism to another in a food chain?

May/June 2021

The diagram represents a food web. How many organisms obtain nutrition from more than one trophic level?

May/June 2021

The organisms in a food chain may be shown using pyramids of numbers or pyramids of biomass. Which diagram shows a pyramid of numbers?

May/June 2021

Define what is meant by the terms herbivore and carnivore.

May/June 2021

The food web illustrates the feeding relationships in a woodland. If all the chaffinches in the food web die, what effect would this have?

May/June 2022

The food web illustrates the feeding links in a woodland. If every chaffinch in the food web dies, what effect would this have?

May/June 2022

What name is given to an organism that gains its energy from dead organic material?

May/June 2022

The food web illustrates the feeding relationships within a woodland. If every chaffinch in the food web dies, what effect would this have?

May/June 2022

The food web illustrates the feeding relationships in a woodland. If every chaffinch in the food web died, what effect would this have?

May/June 2022

The food web illustrates the feeding relationships within a woodland. If every chaffinch in the food web dies, what effect would this have?

May/June 2022

What is the term for an organism that gains its energy from dead organic material?

May/June 2022

The food web illustrates the feeding links within a woodland. If every chaffinch in the food web were to die, what effect would this have?

May/June 2022

Fig. 4.1 shows a rainforest food web.

May/June 2022

Coral reefs form ecosystems of great importance.

May/June 2022

In a pyramid of numbers, what does the apex of the pyramid represent?

May/June 2023

What is the chief source of energy in most food chains?

May/June 2023

A single tree provides food for a very large number of caterpillars. A number of small birds feed on the caterpillars. These small birds are then eaten by a bird of prey. Which diagram represents the pyramid of biomass?

May/June 2023

Which diagram illustrates energy transfer through a food chain?

May/June 2023

The diagram presents a pyramid of biomass for every organism in an ecosystem. Which organisms are carnivores?

May/June 2023

The diagram shows two pyramids based on food chains in which the producer is a large tree. What are the two pyramids showing?

May/June 2023

Write the food chain represented by the pyramid of numbers in Fig. 5.1.

May/June 2023

A student wrote down information about an aquatic habitat. Fig. 4.1 contains the student’s notes: “Aquatic plants are food for freshwater shrimps and midges. Mayflies also eat aquatic plants. Mayflies are food for salmon. Stoneflies feed on midges and are eaten by salmon. Salmon also feed on freshwater shrimps. Herons feed on salmon.”

May/June 2023

The diagram illustrates a food chain. plant leaf $\rightarrow$ slug $\rightarrow$ frog $\rightarrow$ fox Which terms are used to describe the fox’s position in this food chain?

May/June 2024

The diagram illustrates a food web. Which animal acts as a secondary consumer?

May/June 2025

The diagram illustrates the transfer of energy through a food chain. Which organism is the producer in the food chain?

May/June 2025

The diagram illustrates a food web. Which food chain belongs to the food web?

May/June 2025

The food web represents part of an ocean ecosystem. Which row gives the number of secondary consumers and the number of tertiary consumers in the food web?

May/June 2025

Within a food chain, zebras are large mammals that feed on grass. Many insects live on the zebras and draw their blood. The insects are eaten by birds. Some biological pyramids are shown in the diagrams. Which row shows the correct types of pyramids for this food chain?

May/June 2025

State the genus name of the Asian elephant.

May/June 2025

For the food chain in Fig. 7.1, state the letter in Fig. 7.2 that represents: a pyramid of numbers ................................................ a pyramid of biomass ................................................

May/June 2025

The diagram illustrates a food web. Which arrow does not indicate the direction of energy flow?

Oct/Nov 2016

The graph illustrates the population of mosquito larvae in a pond. On day 3, fish that feed on mosquito larvae are introduced into the pond. What is the most likely explanation for the fall in the larvae population after day 3?

Oct/Nov 2016

The diagram illustrates part of a food web. Fishermen frequently catch and take away large fish. What is most likely to happen to the numbers of penguins, small fish and seals?

Oct/Nov 2016

What positions in a food chain could a carnivore and a herbivore occupy?

Oct/Nov 2016

What does the widest block in a pyramid of numbers represent in a grassland ecosystem?

Oct/Nov 2017

Which pyramid of numbers contains a greater number of herbivores than producers?

Oct/Nov 2017

The diagram illustrates how energy moves through a food chain. green plant $\rightarrow$ rabbit $\rightarrow$ fox Which process in the rabbit makes it possible for energy to be transferred to the fox?

Oct/Nov 2017

The diagram illustrates a food web. What do the arrows show?

Oct/Nov 2017

The diagram shows a section of a food web. What would be most likely to make the frog population larger?

Oct/Nov 2017

What does the broadest bar in a pyramid of numbers indicate for a grassland ecosystem?

Oct/Nov 2017

Which pyramid of numbers contains more herbivores than producers?

Oct/Nov 2017

The biomass in each trophic level of an ecosystem is measured. The findings are presented in the table. Which trophic level includes herbivores?

Oct/Nov 2017

The diagram illustrates a food web. What do the arrows indicate?

Oct/Nov 2017

Define population.

Oct/Nov 2017

Fig. 7.1 presents a section of a river food web.

Oct/Nov 2017

Explain why plants form the beginning of most food webs.

Oct/Nov 2017

The diagram illustrates a woodland food web. Which statement is correct?

Oct/Nov 2018

The diagram illustrates a food web. Which row contains a food chain from this food web?

Oct/Nov 2018

Which organism in the food chain illustrated makes use of light energy?

Oct/Nov 2018

What does the term food chain mean?

Oct/Nov 2018

The diagram illustrates a food web. Which row represents a food chain in this food web?

Oct/Nov 2018

The diagram illustrates a marine food web. Which two animals are the secondary and tertiary consumers?

Oct/Nov 2018

The diagram illustrates a food web in a woodland. What is most likely to happen if humans remove all of tree type X?

Oct/Nov 2018

Fig. 3.1 presents a food chain from the sea. The chain is: green alga → sea snail → crab → starfish.

Oct/Nov 2018

Which diagram represents energy being transferred along a food chain?

Oct/Nov 2019

The diagram illustrates a food chain. Which organism is the secondary consumer?

Oct/Nov 2019

The diagram illustrates a biomass pyramid. Which organisms are located at position $X$?

Oct/Nov 2019

What does the term trophic level mean?

Oct/Nov 2019

The diagram illustrates a pyramid of numbers in a food chain. What kind of organism is the tree shrew?

Oct/Nov 2019