Plant Disease & Defences - exam practice
Plant Disease & Defences
Question 1 of 3
A farmer is growing cabbages in his field.
Plants need mineral ions for healthy growth.
Which part of the cabbage plant takes in mineral ions?
The farmer provides his cabbages with a nutrient solution containing nitrate ions and magnesium ions.
Describe the functions of these ions in plants and their deficiency symptoms.
A gardener is testing the effect of using different fertilisers on the growth of plants.
The gardener decided to measure the growth by counting the number of leaves.
Suggest a better method of measuring the growth of the plants.
Give two reasons why your method is better than the gardener’s method.
A scientist investigated the effect of nitrate ion concentration on barley growth.
She placed barley seedlings in five test tubes containing different concentrations of nitrate fertiliser.
After a week, the scientist measured the length of the seedlings.
Her results were recorded in a table.
What should the scientist have used as a control for this investigation?
Which seedling showed the largest change in length?
Explain how nitrate ions were absorbed by the seedlings.