Chapter 10 / 12 short lessons
Nutrition and transport in plants
Follow carbon dioxide, water and sugars through a plant. Use leaf structure and practical evidence to explain photosynthesis, transpiration and translocation.
G3 Pure Biology / K325 / 2027 syllabus
What do you think?
A plant loses more water on a windy day. What pulls replacement water up its xylem?
Lessons
0 of 12 marked as readLeaf structure and gas exchange
Identify tissues in a dicot leaf section and explain their roles in photosynthesis and gas exchange.
About 6 minFinding xylem and phloem
Identify the positions and functions of xylem, sieve-tube elements and companion cells in herbaceous dicots.
About 6 minRoot hairs: water and ion uptake
Explain root-hair adaptations and distinguish water uptake from uptake of mineral ions.
About 5 minPhotosynthesis makes food
State the photosynthesis equations and explain energy conversion, carbohydrate uses and dependence of most life on photosynthesis.
About 6 minMeasuring photosynthesis
Plan and interpret investigations of light, carbon dioxide or temperature using oxygen output as a rate indicator.
About 6 minReading a limiting-factor graph
Explain how light, carbon dioxide and temperature can limit photosynthesis.
About 6 minLight, dark and the compensation point
Explain net gas exchange in light and dark, the compensation point and hydrogencarbonate indicator results.
About 7 minThe transpiration stream
Explain transpiration, water-potential changes and transpiration pull through xylem.
About 6 minTesting transpiration factors
Interpret potometer results and explain effects of air movement, temperature, humidity and light.
About 7 minPlot and read a transpiration graph
Plot potometer results to the marked rules, read values and rates from the graph, and state sources of error with their effects.
About 7 minWhen a plant wilts
Explain wilting by comparing water loss, water uptake and cell turgor.
About 5 minTranslocation: moving sugars in plants
Describe translocation in phloem and interpret evidence from ringing and tracer studies.
About 6 minWhat you will be able to do
- Identify transport and gas-exchange structures in dicot sections.
- Explain photosynthesis and interpret rate experiments.
- Trace water from soil to leaf and explain changes in transpiration.
- Explain food transport using source, sink and phloem evidence.
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