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Paper 1 H - SAMPLE SET 1 Q7 Answers

7) A gardener is looking at the plants in his greenhouse.

7.1) Some of the plants have a disease.
Give two ways the gardener could identify the pathogen infecting the plants. [2 marks]
1. ________________________________________
2. ________________________________________

7.2) Plants can become unhealthy if they do not have essential mineral ions.
Describe the appearance of plants with:
  • nitrate deficiency
  • magnesium deficiency.
[2 marks]

Nitrate deficiency ________________________________________
Magnesium deficiency _____________________________________

7.3) 
Plants need other mineral ions.
  • Potassium ions are needed for healthy root growth.
  • Phosphate ions are needed for healthy flowers and fruits.

The gardener makes his own garden compost.
The percentage (%) of minerals in his compost was compared with two fertilisers he could buy.
The data are shown in Table 3.
Picture
The gardener buys Fertiliser S.
Explain why he chose Fertiliser S. [4 marks]

​​​​​​​​​(Total for Question 7 = 8 marks)

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