Write the balanced equation of photosynthesis and say where in the plant it happens. With a labelled leaf diagram, show how each raw material reaches the leaf and where oxygen leaves.

1. 1 · Define in one line. Photosynthesis is the process by which green plants make glucose from carbon dioxide and water, using sunlight trapped by chlorophyll, and give out oxygen.
2. 2 · Write the equation. 6CO₂ + 12H₂O → C₆H₁₂O₆ + 6H₂O + 6O₂, with sunlight and chlorophyll over the arrow.
3. 3 · Give each raw material and its source.
   • Carbon dioxide: from the air, through the stomata of leaves.
   • Water and minerals: from the soil, through root hairs, then up the xylem by transpiration pull.
   • Sunlight: falls on the leaf and is trapped by chlorophyll.
   • Chlorophyll: present in the chloroplasts of leaf cells.
4. 4 · Give the two steps. The light reaction captures light energy; the dark reaction forms glucose. Glucose is stored as starch, and oxygen leaves through the stomata.
5. 5 · Draw a leaf. [Diagram: leaf with arrows for sunlight falling on it, CO₂ entering and O₂ leaving through stomata, water coming in through a vein (xylem) and food going out (phloem)]
6. 6 · Link to daily life. All our food, from rice to vegetables, comes from photosynthesis, which also refills the oxygen we breathe.
7. 7 · Close in one line. So photosynthesis turns the sun's energy into chemical energy stored in food.

Scoring tip: Write the equation with the conditions over the arrow, and give a source for every raw material: each earns marks.