O LevelBiologyCambridgeExam Questions7. Transport in Flowering Plants7.1 Uptake & Transport of Water and Ions

Uptake & Transport of Water and Ions (Cambridge O Level Biology)

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7.1 Uptake & Transport of Water and Ions

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7.1 Uptake & Transport of Water and Ions

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1
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Which order below is correct in describing the pathway of water as it travels from the roots through a plant?

  • Root hair cell → xylem → mesophyll cells → air spaces → stomata

  • Root hair cell → xylem → air spaces → mesophyll cells → stomata

  • Root hair cell → mesophyll cells → phloem → stomata

  • Root hair cell → mesophyll cells → xylem → stomata

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21 mark

Which feature of a root hair cell helps it take up ions from water in the soil? 

  • The cell has a partially permeable cell wall.

  • The cell can provide a source of energy.

  • The cell vacuole has a high ion concentration.

  • The cell vacuole has a low water potential.

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1
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A dicot plant is placed into a bowl of water coloured with red dye. 

After 1 hour, a cross section of one of the roots is cut. 

After 4 hours, a cross section is cut from the stem. 

8--q4-root-and-stem

Which labelled regions would be stained red in each case? 

  • 1 and 3

  • 1 and 4

  • 2 and 4

  • 2 and 3

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2
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Which of the following is a correct explanation of the effect of root hairs on absorption?

  • Provide a large surface area, maximising the rate of absorption of water and ions by osmosis.

  • Provide a large surface area, maximising the rate of absorption of water by osmosis and ions by active transport.

  • Increase the surface area, maximising the uptake of water by osmosis and ions by diffusion.

  • Provide a surface area, increasing the rate of absorption of water and ions by active transport.

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31 mark

An area of grass plants becomes flooded with seawater. 

Sea water contains a higher concentration of salt than the root hair cells of grass plants. 

What is the effect of seawater on the functions of the root hairs?

  uptake of ions by root hairs uptake of water by root hairs
A no longer occurs no longer occurs
B no longer occurs still occurs
C still occurs no longer occurs
D still occurs still occurs

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