Pupil sheet · How plants make food
How plants make food — return questions
Name ______________________ Date ____________
Use one to two weeks after the lessons. Keep the notes and the lesson closed.
1. state
State the word equation for photosynthesis, including the two things that must be present.
2. complete
Complete the sentences about chlorophyll.
Chlorophyll is a … pigment
found in …
It transfers energy from …
into energy in …, for the synthesis of carbohydrates.
3. state
Supplement. State the balanced chemical equation for photosynthesis.
4. complete
Complete the sentences about the starch test of a leaf.
Boiling water kills the cells and breaks their …
Hot ethanol dissolves the …
The ethanol is heated in a …, never over a flame.
Where there is starch, iodine solution turns …
5. match
Match each need for photosynthesis to the way it was taken away from a leaf.
Write the number of the matching option.
- an opaque foil strip folded over both surfaces
- the cream parts of a variegated leaf
- soda lime in a sealed clear bag
- hot ethanol in a water bath
- Light: ______
- Chlorophyll: ______
- Carbon dioxide: ______
6. explain
Explain why plants are destarched before the investigation, and how you can check that it worked.
7. complete
Complete the sentences about what a plant does with its glucose.
Glucose is stored as …
It is built into … for cell walls.
It travels round the plant as …
in the …
Flowers make …, which attracts insects for pollination.
8. explain
Explain the importance of (a) nitrate ions and (b) magnesium ions to a plant.
(a) Nitrate ions
(b) Magnesium ions
9. explain
Plants store energy as starch. Explain why starch suits this job better than glucose.