Transport in Plants

Worked examples (12)extended set

• 1Identifying a root hair cell on a root section
• 2The pathway of water from soil to leaf (multiple choice)
• 3Calculating the extra surface area given by root hairs
• 4How water and nitrate ions enter a root hair cell
• 5Tracing a water molecule from the soil to a leaf cell
• 6Using a stain to find the water-carrying tissue
• 7Rate of dye movement up a stem from a graph
• 8Root systems of two plants in a dry habitat
• 9A correct statement about root hair cells (multiple choice)
• 10Why transplanted seedlings wilt
• 11Plants with and without root hairs
• 12Planning an investigation into how fast water moves up a stem

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) extended-response style

Worked examples (12)extended set

• 1Functions of the xylem and phloem in a leaf vein
• 2Finding the xylem and phloem in a stem section
• 3Xylem in the root, the stem and the leaf (multiple choice)
• 4Xylem and phloem in a root compared with a stem
• 5The structure of xylem vessels (multiple choice)
• 6The vein in a leaf section
• 7Which section shows where the dye travelled?
• 8Magnification of a xylem vessel drawing
• 9Tracing labelled nitrate and labelled sucrose
• 10A disease that blocks the xylem
• 11What aphids drink: xylem or phloem?
• 12How young cells become a xylem vessel

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 6 (Alternative to Practical) style
• ✓Model answer — Paper 4 (Extended) extended-response style

Worked examples (12)extended set

• 1Describing how water leaves a leaf
• 2Conditions for the slowest transpiration (multiple choice)
• 3Leaf structure and water vapour loss
• 4How transpiration pulls water up the xylem
• 5Potometer results at different temperatures
• 6Sketch graph of transpiration against temperature (multiple choice)
• 7A hot, windy, dry afternoon versus a cool, still, humid morning
• 8Greased leaves: where is the water lost?
• 9How and why a plant wilts
• 10Why can a plant not simply stop transpiring? (multiple choice)
• 11Planning an investigation into temperature and water loss
• 12Transpiration and water uptake over 24 hours

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 6 (Alternative to Practical) style
• ✓Model answer — Paper 4 (Extended) extended-response style

Worked examples (12)extended set

• 1What the phloem carries
• 2What moves in the phloem, and in which direction (multiple choice)
• 3Direction of translocation in a fruiting plant (multiple choice)
• 4Translocation in a sugar beet plant
• 5A ring of bark removed from a branch
• 6Following radioactive carbon from a leaf
• 7Why a leaf changes from a sink to a source
• 8Sources and sinks in a tulip in spring
• 9A seed as a sink: reading a growth curve
• 10Removing flowers to get bigger potatoes
• 11Starch in the roots of a tree through the year
• 12Shading potato plants: from leaf to tuber

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) extended-response style