What do you think was the cause of the largest error or uncertainty in your investigation?
Explain what you could do to reduce the size of this error if you were to repeat the
How would I answer this question for the light intensity experiment on pond weed?
You could talk about for example how each pond weed is different and will therefore react differently to light. And then it's the memorised answer for the next part: "You can take a mean by adding up all the results and dividing by the number of results, making sure to discard any anomalies."