IGCSEBiology: Double ScienceEdexcelExam Questions2. Structure & Function in Living OrganismsExcretion

Excretion (Edexcel IGCSE Biology: Double Science)

Exam Questions

18 mins2 questions
1a
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All living things carry out eight 'life processes', one of which is excretion.

(i)

Define the term excretion. 

(1)

(ii)

List five other life processes.

(5)

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1b
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A substance that is excreted by plants is oxygen. 

State the source of this excreted oxygen.

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1c
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Complete the table below using either a ✓ or a ✗ to indicate whether or not the plant processes described are examples of excretion

Process Excretion ✓ or ✗
Water is drawn up from the roots of the plant and is lost through the leaves  
Carbon dioxide is released from respiring cells  
Dead leaves fall off deciduous plants during the autumn  

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2a
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The diagram shows some human excretory organs. 

human-3

Name organ X and organ Z shown in the diagram.

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2b
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One waste product that is excreted from the human body is urea. 

Urea is made from excess proteins that can't be stored in the body. 

Excess carbohydrates and lipids do not need to be excreted,

Suggest why excess carbohydrates and lipids do not need to be excreted.

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2c
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Carbon dioxide is one of the substances that is excreted by the body.

Explain the importance of excreting carbon dioxide.

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2d
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Another organ of excretion is the skin. 

Explain how the skin is able to carry out excretion. 

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