Plant Nutrition

Worked examples (12)extended set

• 1Finding the site of photosynthesis in a palisade cell
• 2Matching the carbohydrates a plant makes to their uses
• 3Choosing the balanced equation for photosynthesis (multiple choice)
• 4Which factor is limiting at two points on a graph (multiple choice)
• 5Describing and explaining the effect of temperature on the rate
• 6Reading a percentage-of-maximum graph and applying it
• 7Predicting hydrogencarbonate indicator colours in light and dark
• 8Showing that carbon dioxide is needed, with a control
• 9Planning a pondweed investigation into light intensity
• 10Photosynthesis and respiration over 24 hours
• 11Identifying limiting factors from greenhouse data
• 12Photosynthesis at different depths in a lake

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) data-response style

Worked examples (12)extended set

• 1Labelling the tissues in a leaf section
• 2Identifying a tissue on a leaf section (multiple choice)
• 3Features of the spongy mesophyll (multiple choice)
• 4Explaining how each leaf structure helps photosynthesis
• 5Xylem and phloem in a vascular bundle
• 6Counting stomata and calculating stomatal density
• 7Comparing a sun leaf with a shade leaf
• 8Estimating leaf area on a centimetre grid
• 9Magnification of a leaf section and why leaves are thin
• 10Comparing two leaves and drawing them well
• 11Greased leaves: where does a leaf lose water?
• 12Where are a leaf's chloroplasts, and why?

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

Worked examples (12)extended set

• 1Which ion makes chlorophyll and which makes amino acids (multiple choice)
• 2Naming the ions in a hydroponic nutrient solution
• 3Explaining why plants short of magnesium or nitrate grow poorly
• 4Interpreting water culture results from a bar chart
• 5Setting up a fair water culture experiment
• 6Oxygen and the active uptake of nitrate ions
• 7Which process stops when respiration stops (multiple choice)
• 8Reading a fertiliser yield curve
• 9Magnesium, chlorophyll and the rate of photosynthesis
• 10Fertiliser calculations for a field
• 11Why does a Venus flytrap catch insects?
• 12When more nitrate reduces the yield

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) data-response style