light intensity rate phtsyths practical

Question 1

how can we use pondweed to show the rate of photosynthesis as light intensity changes

Answer 1

• place lamp at specific distance from pondweed
• count bubbles in one minute period and record
• move pondweed 10 back and repeat
• repeat 5 times

Question 2

how can we measure the gas produced more accurately

Answer 2

• place capillary tube over pondweed tube for oxygen to collect
• use syringe to draw oxygen alongside ruler and measure