Mineral nutrition and movement of substances
Answers are for parents and teachers.
1
Explain root pressure and its evidence in 3β4 sentences.
The root pushes water upward; sap dripping from cut grape or poplar shoots is evidence.
2
Fertilizer table: type β example β effect.
Organic β manure β improves soil; nitrogen β saltpetre β speeds growth; phosphorus/potassium β yield and ripening.
3
Do the dye experiment at home with a white flower (or celery) and draw the result.
Veins and petals take on the dye colour.
4
If a cotton plant needs 3 waterings of 4 litres each, how many litres do 5 plants need? (3 Γ 4 Γ 5)
60
5
Why is it better to water in the evening than in the heat of the day in summer?
In the evening less water evaporates and the plant absorbs more; in midday heat water evaporates fast and leaves may scorch.