IGCSE Biology Ecosystems

What type of organism is x?

• a carnivore
• a decomposer
• a herbivore
• a producer

In this food chain, which population will have the largest biomass and which will have the largest population, respectively?

• A
• B
• C
• D

Name an arrow missing from this diagram

• an arrow from plants to animals
• an arrow from carbon dioxide in the air to animals
• an arrow from carbon dioxide in the air to fossil fuels
• an arrow from animals to plants

Which organisms are the producers?

• grass snakes
• lettuce plants
• slugs
• fungi

Which labelled organisms in the food web are both secondary and tertiary producers?

• A
• B
• C
• D

Which diagram correctly shows the energy flow through the pyramid?

• A
• B
• C
• D

Which statement about population growth is correct?

• A
• B
• C
• D

What is the source of energy for the grass in the food chain?

• antelopes
• carbon dioxide
• hyaenas
• the sun

What is the natural substance being cycled?

• carbon dioxide
• nitrogen
• oxygen
• water

From which food chain is the least energy lost?

• A
• B
• C
• D