You will complete 21 required practical activities if you are studying GCSE combined science: Trilogy. You could be asked questions about the apparatus, methods, safety precautions, results, analysis and evaluation of these experiments.
There are no required practical activities in the atomic structure and periodic table section. However, there may be some questions drawing on practical skills relating to this topic within other questions on the paper.
These questions have been written by Bitesize consultants as suggestions to the types of questions that may appear in an exam paper.
Two students are investigating the growth of seedlings in different nutrient solutions.
What safety precautions should they take? [2 marks]
Describe the method you would use to investigate the growth of seedlings in different nutrient solutions. [6 marks]
Answer (six from):
The mean growth of seedlings in four different test solutions are shown in the table below.
|Solution added||Mean growth (cm)|
|Magnesium sulfate and potassium nitrate||5.8|
|Magnesium sulfate (deficient in nitrogen)||4.3|
|Potassium nitrate (deficient in magnesium)||3.5|
Two students looked at these results. What conclusions can they draw from them? Use numbers in your answer. [4 marks]
The mean growth of seedlings is the same at 3.5 cm for both distilled water and potassium nitrate . Seedlings grown in magnesium sulfate grew more than either of these with a mean of 4.3 cm . The greatest mean growth was 5.8 cm and this was in seedlings grown in both magnesium sulfate and potassium nitrate .
If an exam question says 'use numbers or data in your answer' you will normally get one mark for saying what is happening and another mark for using the correct number. In the question above, the first line of the answer is 'The mean growth of seedlings is the same at 3.5 cm for both distilled water and potassium nitrate .' The first mark is for saying the mean growth is the same and the second mark is for using the correct number (3.5 cm)