The diagram shows the numbers and biomass of organisms in a food chain. | organism | number | biomass/g | |----------|--------|-----------| | oak tree | 1 | 500,000 | | aphids | 10,000 | 1,000 | | ladybirds| 200 | 50 | a) (i) Calculate the difference in biomass between the aphids and the ladybirds. answer = ____________ (ii) Energy is lost between each trophic level of a food chain. Suggest how this energy is lost between each trophic level. (iii) The diagram shows a pyramid of numbers for this food chain. | | | |----------|----------| | ladybirds| | | aphids | | | oak tree | | In the box, draw a pyramid of biomass for this food chain. (b) (i) Carbon can be recycled in the environment. State the name of the process in which plants remove carbon dioxide from the atmosphere. (ii) Explain how the recycling of paper and plastics can benefit the environment.

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The diagram shows the numbers and biomass of organisms in a food chain - Edexcel - GCSE Biology - Question 6 - 2013 - Paper 1

Question 6

The diagram shows the numbers and biomass of organisms in a food chain. | organism | number | biomass/g | |----------|--------|-----------| | oak tree | 1 | 50... show full transcript

Worked Solution & Example Answer:The diagram shows the numbers and biomass of organisms in a food chain - Edexcel - GCSE Biology - Question 6 - 2013 - Paper 1

Step 1

Calculate the difference in biomass between the aphids and the ladybirds.

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Answer

To calculate the difference in biomass between the aphids and the ladybirds, we subtract the biomass of the ladybirds from that of the aphids.

Biomass of aphids: 1,000 g
Biomass of ladybirds: 50 g

Difference = 1,000 g - 50 g = 950 g

Thus, the answer is 950 g.

Step 2

Suggest how this energy is lost between each trophic level.

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Answer

Energy is lost between trophic levels mainly through:

Excretion: Waste products that are not used by the organism.
Heat Loss: Metabolic processes release energy as heat.
Incomplete Digestion: Some parts of organisms may be indigestible.
Movement: Energy is used for activities such as hunting or flying.

Step 3

Draw a pyramid of biomass for this food chain.

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Answer

The pyramid of biomass should show the biomass at each trophic level:

Oak Tree: 500,000 g (base)
Aphids: 1,000 g (middle)
Ladybirds: 50 g (top)

The pyramid will visually represent a larger mass at the base decreasing towards the top.

Step 4

State the name of the process in which plants remove carbon dioxide from the atmosphere.

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Answer

The process by which plants remove carbon dioxide from the atmosphere is called photosynthesis.

Step 5

Explain how the recycling of paper and plastics can benefit the environment.

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Answer

Recycling paper and plastics plays a crucial role in environmental conservation. Some benefits include:

Reduced Deforestation: Recycling paper reduces the need to cut down trees, thus preserving habitats and biodiversity.
Lower Landfill Contribution: Less waste ends up in landfills, which takes up space and reduces pollution.
Decreased Energy Use: Recycling often uses less energy than producing new products, conserving fossil fuels.
Pollution Reduction: Less pollution is generated from recycling processes compared to making new materials from raw resources.
Promoting Sustainability: Encouraging recycling helps create a closed-loop system, reducing the strain on the environment and promoting sustainable practices.

The diagram shows the numbers and biomass of organisms in a food chain - Edexcel - GCSE Biology - Question 6 - 2013 - Paper 1

Worked Solution & Example Answer:The diagram shows the numbers and biomass of organisms in a food chain - Edexcel - GCSE Biology - Question 6 - 2013 - Paper 1

Calculate the difference in biomass between the aphids and the ladybirds.

Suggest how this energy is lost between each trophic level.

Draw a pyramid of biomass for this food chain.

State the name of the process in which plants remove carbon dioxide from the atmosphere.

Explain how the recycling of paper and plastics can benefit the environment.

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