Energy flow — Paper 1 · IGCSE Biology (9-1) 0970

36 Black truffle is a fungus that obtains nutrients from the roots of hazel trees. Female pigs find and eat the fungi. What is the principal source of the energy for this food chain? A female pigs B hazel trees C soil D the Sun

1 marks

Answer: D

This question in 0970/11 May/June 2018

36 What process uses the principal source of energy input to biological systems? A ingestion B decomposition C photosynthesis D respiration

1 marks

Answer: C

This question in 0970/11 May/June 2019

35 Which diagram correctly shows the flow of energy? A producers consumers decomposers B consumers producers decomposers C producers consumers decomposers D decomposers consumers producers

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2019

35 The diagram shows a simple food chain. grass → gazelle → lion The arrows show the energy flow through the food chain. Where does the grass obtain its energy? A oxygen from air B water C minerals in soil D the Sun

1 marks

Answer: D

This question in 0970/11 May/June 2020

36 The diagram shows a food chain. grass grasshopper frog snake hawk What is the tertiary consumer in this food chain? A frog B grasshopper C hawk D snake

1 marks

Answer: D

This question in 0970/12 Oct/Nov 2021

36 Which process uses the principal source of energy input to biological systems? A ingestion B decomposition C photosynthesis D respiration

1 marks

Answer: C

This question in 0970/11 May/June 2022

36 Which process uses the principal source of energy input to biological systems? A ingestion B decomposition C photosynthesis D respiration

1 marks

Answer: C

This question in 0970/12 May/June 2022

38 The block at the base of each pyramid represents the number of producers. Which pyramid of numbers has more tertiary consumers than secondary consumers? A B C D

1 marks

Answer: C

This question in 0970/12 Oct/Nov 2022

36 The diagram shows energy flow from the Sun, through a food chain and into the environment. Sun 1 2 plant animal animal What is the form of energy for each numbered arrow? stage 1 stage 2 A heat chemical B heat kinetic C light chemical D light kinetic

1 marks

Answer: C

This question in 0970/11 May/June 2023

37 What is the principal source of energy for most food chains? A carbon dioxide gas B glucose C oxygen D sunlight

1 marks

Answer: D

This question in 0970/12 May/June 2023

40 The diagram shows the flow of energy in an ecosystem. respiration Sun producer 1 2 death 3 Which row correctly completes boxes 1, 2 and 3? 1 2 3 A herbivore carnivore decomposer B carnivore herbivore decomposer C decomposer carnivore herbivore D carnivore decomposer herbivore

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2023

39 Which diagram shows a pyramid of biomass for the food chain shown? key tree caterpillar bird A B C D

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2024

37 The graphs show the number of herbivores in a habitat over a period of time. At time X, the carnivores are removed from the habitat. Which graph shows the effect of this on the number of herbivores? A B number of number of herbivores herbivores X X time time C D number of number of herbivores herbivores X X time time

1 marks

Answer: A

This question in 0970/11 May/June 2025

33 What is the principal source of energy input to biological systems? A kinetic B photosynthesis C respiration D the Sun

1 marks

Answer: D

This question in 0970/12 May/June 2025

31 The diagram shows the energy within the producers in an ecosystem and how much is transferred to primary consumers and eventually lost to the environment. 4500 kJ Sun 45 000 kJ primary producers secondary consumers 50 000 kJ consumers 5000 kJ How much energy is transferred from primary consumers to secondary consumers? A 5 kJ B 50 kJ C 500 kJ D 5000 kJ

1 marks

Answer: C

This question in 0970/12 Oct/Nov 2025