Leaf Structure (Cambridge O Level Biology)

Exam Questions

28 mins6 questions
1a
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4 marks

A plant leaf contains various structures that makes it adapted for the process of photosynthesis.

Complete the following by drawing lines to connect each listed structure with the correct adaptation.

Structure   Adaptation
     
Waxy cuticle   Allows gas exchange to occur
     

Stomata

  Tightly packed with chloroplasts for maximum absorption of light
     
Palisade mesophyll   Protect the leaf from water loss
     

Spongy mesophyll

  Increases the surface area to volume ratio for the diffusion of gases

1b
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4 marks

Fig. 1 shows the cross section of a leaf.

figFig. 1

Structure Y represents a vascular bundle.

(i)

Identify two types of tissue found in structure Y.

[2]

(ii)

Describe the function of each type of tissue identified at part (i).

[2]

1c
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3 marks

Layer X and Z in Fig. 1 form the outer boundaries of the leaf.

(i)

State one visible difference between layer X and Z.

[1]

(ii)

The cells in layer X are transparent.

Explain the importance of this to the plant.

[2]

1d
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3 marks

Carbon dioxide must enter the chloroplasts within plant cells for photosynthesis to occur.

Describe the movement of carbon dioxide from the atmosphere into the chloroplasts.

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1a
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2 marks

Fig. 1 is a scanning electron micrograph of a vertical section through part of the leaf of a broad bean plant, Vicia faba.cie-igcse-2018-s3-p4-q3

Fig. 1

State the names of the tissues labelled A and B.

1b
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3 marks

The cells in regions B and C in Fig. 1 have a large surface area.

Explain why this is necessary for the functioning of the leaf cells.

1c
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2 marks

Explain why there are many interconnecting air spaces within the leaf.

1d
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3 marks

Stomata are found on the lower surface of broad bean leaves.

Describe the function of stomata.

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