Science (Double Award) — Biology

Excretion (Edexcel IGCSE Science): Exam Questions

2 questions · 18 marks · ≈ 18 min

Guided practice

110 marksmedium

6 marks

All living things carry out eight 'life processes', one of which is excretion.

(i) Define the term excretion.

(1 mark)

(ii) List five other life processes.

(5 marks)

Your answer

1 mark

A substance that is excreted by plants is oxygen.

State the source of this excreted oxygen.

Your answer

3 marks

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

Your answer

How did you do?/ 10

28 marksmedium

2 marks

The diagram shows some human excretory organs.

human-3

Name organ X and organ Z shown in the diagram.

Your answer

2 marks

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.

Your answer

2 marks

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

Explain the importance of excreting carbon dioxide.

Your answer

2 marks

Another organ of excretion is the skin.

Explain how the skin is able to carry out excretion.

Your answer

How did you do?/ 8

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