One- and two-mark questions will start with command words such as 'Describe...' or 'Explain...'. Some command words are easy to understand such as:
The command words 'Describe...' and 'Explain...' can be confusing. If you are asked to describe a graph, you will be expected to write about its overall shape, whether it is linear or curved, the slope of gradients etc. If you are asked to explain why a pattern or trend is seen in a graph, you will be expected to use your science knowledge, not just say what you see (which is a description), eg The graph shows a steep linear increase for the first three hours because…
Explain how and why questions often have the word 'because' in their answer. Describe questions don't.
The number of marks per question part is given in this form [2 marks]. It is essential that you give two different answers if a question is worth two marks. Sometimes you can gain a second mark by giving the units in a calculation or stating specific data points, eg the mass of the plant tissue decreased by 2 g.
These questions have been written by Bitesize consultants as suggestions to the types of questions that may appear in an exam paper.
Use one word from the box to complete the sentence.
The structure in a cell that controls the cell's activities is called the _________
Give two differences between plant and animal cells.
Answer (any two of):
Name the type of cell in plants that can differentiate into different types of cell.
Meristem cell or meristematic cell.
Note that you must be specific. It isn’t enough to call it a 'stem cell', as stem cells occur in animals.
In an osmosis experiment, after 45 minutes, a potato cylinder had lost 2.4 g in mass.
Calculate the rate of water loss from the potato cylinder in grams per hour.
Note that rate is a compound measure and always has more than one unit.