Scientists can show the relationships between organisms in a variety of ways. This food chain shows the energy content at each trophic level. This food chain shows the energy content at each trophic level: - plants: 8450 J - rabbits: 780 J - fox: 90 J - fleas: 4 J (a) (i) Calculate the percentage of energy that is transferred from the rabbits to the fox. (2) (ii) State two ways in which energy can be lost between the trophic levels of the rabbit and the fox. (2)

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Scientists can show the relationships between organisms in a variety of ways - Edexcel - GCSE Biology - Question 3 - 2011 - Paper 1

Question 3

Scientists can show the relationships between organisms in a variety of ways. This food chain shows the energy content at each trophic level. This food chain shows ... show full transcript

Worked Solution & Example Answer:Scientists can show the relationships between organisms in a variety of ways - Edexcel - GCSE Biology - Question 3 - 2011 - Paper 1

Step 1

(a) (i) Calculate the percentage of energy that is transferred from the rabbits to the fox.

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Answer

To find the percentage of energy transferred from the rabbits to the fox, you can use the formula:

ext{Percentage} = rac{ ext{Energy at fox}}{ ext{Energy at rabbits}} imes 100

Substituting the given values:

ext{Percentage} = rac{90 ext{ J}}{780 ext{ J}} imes 100 \\ = 11.54 ext{%} \\ \approx 12 ext{%}

Therefore, the percentage of energy transferred from the rabbits to the fox is approximately 12%.

Step 2

(a) (ii) State two ways in which energy can be lost between the trophic levels of the rabbit and the fox.

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Answer

Respiration - Energy is lost as heat during respiration processes.
Excretion - Energy is lost through waste products that are not digested and absorbed.

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