WJEC Biology (BY2) Revision sheets: Assorted past paper question and answers

Assorted from the past few years past-papers and I used mark-schemes for the answers. Good to learn the sequence of some longer questions as they might come up. As you go through questions they get older and older.

Hope this helps someone :-)

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  • Created by: Rebecca
  • Created on: 29-05-13 11:59

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BIOLOGY PAST-PAPER QUESTIONS

Explain how inspiration is bought about (2)

External intercostal muscles contract, ribcage moves upwards and diaphragm lowers so volume
increases
This means the pressure is less than atmospheric so air flows in

Explain why the bicuspid valve often has to be replaced because it ceases to work…

Page 2

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Explain the phloem's role in the plant (1)

Carries sugars and other nutrients around the plant

Explain how the endodermis cells carry out their function in the uptake of water and minerals in
the plant (4)

Water proof casparian strip
Blocks apoplast pathway
Transport of minerals
Into symplast pathway
Active…

Page 3

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Explain how the flow of water into guard cells leads to opening of stromatal pores (4)

Active transportation of potassium ions into guard cells which lowers water potential
Water flows into guard cells by osmosis/down water potential gradient
Guard cells become turgid
Inner wall of guard cell is thicker/inelastic
So…

Page 4

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Explain what is meant by the terms source and sink (2)

Source ­ region where sugar is produced and exported e.g. leaves
Sink ­ region where photosynthesis is used e.g. roots

What name is given to the transport in plants from source to sink? (1)

Translocation

Name the tissue and…

Page 5

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What is the significance of the Bohr effect (shift to right)? (1)

More oxygen available/dissociates more easily/ lower affinity for oxygen

Suggest one change which could be observed in the blood of an athlete who had been training at
high altitude (1)

More red blood cells/ more haemoglobin

How are…

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