3 (a) Figure 6 shows a root hair cell from a strawberry plant - Edexcel - GCSE Biology - Question 3 - 2020 - Paper 1
Question 3
3 (a) Figure 6 shows a root hair cell from a strawberry plant.
(i) Label the cell vacuole in Figure 6.
(ii) Explain how the structure of root hair cells increases ... show full transcript
Worked Solution & Example Answer:3 (a) Figure 6 shows a root hair cell from a strawberry plant - Edexcel - GCSE Biology - Question 3 - 2020 - Paper 1
Step 1
Label the cell vacuole in Figure 6.
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Answer
The vacuole can be labeled by indicating any part or the edge of the vacuole inside the root hair cell structure.
Step 2
Explain how the structure of root hair cells increases water absorption from the soil.
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Answer
Root hair cells increase water absorption through their long, thin projections which increase the surface area, allowing for a greater volume of water to be absorbed. Additionally, the cell wall is thinner, which means that water can travel shorter distances, enhancing the efficiency of water uptake.
Step 3
Calculate the mean rate of growth of fungus at 30 °C.
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Answer
To calculate the mean rate of growth of the fungus at 30 °C, use the formula for mean rate:
extMeanRate=5 daysArea at 30 °C=572 cm2=14.4 cm2 per day
Step 4
State the effect of temperature on the growth of fungus on strawberries from 5 °C to 30 °C.
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Answer
The growth and area of fungus increases as the temperature rises from 5 °C to 30 °C.
Step 5
Explain how boiling stops the enzymes from working.
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Boiling destroys enzymes as they are sensitive to heat. The intense heat alters the shape of the enzyme and denatures it, meaning that the substrate can no longer fit into the active site, consequently stopping the enzymatic reaction.
Step 6
State how osmosis causes the fungus cells to die.
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Answer
Osmosis causes water to move out of the fungus cells into the surrounding sugar solution in the jam, leading to dehydration of the fungus cells and eventually causing them to die.
