Photosynthesis

Question 1

Aim

Answer 1

Investigate the effect of light intensity or the rate of photosynthesis using pondweed by counting the number of oxygen bubbles formed per minute

Question 2

Step one

Answer 2

Place pondweed into boiling tube with the cut end at the top with a fix for him of sodium hydrogen carbonate solution

Question 3

Step two

Answer 3

Leave boiling tube to rest for five minutes

Question 4

Step three

Answer 4

Start stopwatch and count the number of bubbles produced in one minute

Question 5

Step four

Answer 5

For each light intensity/distance repeat the count twice more and take a mean

Question 6

Step five

Answer 6

Repeat steps 1–4 for 10,20,30,40 cm from light source

Question 7

Step six

Answer 7

Plot a graph of results for a rate of photosynthesis against light intensity