1 markWhich 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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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 markA 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.
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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1 markWhich 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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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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