600 years We know from the fossils that were left on rocks which we were able to identify how old those rocks were 3000 million years ago, organisms that could photosynthesise first appeared on the planet This is because any animal-like organisms depend on oxygen to survive, and since there was no oxygen before the plants appeared, the organism couldn’t live Plants not need any oxygen to survive, so this is the reason why they were able to survive on Earth when oxygen had not been there yet The colour of the light The number of bubble produced by the pondweed The amount of water in each test tube The same size of pondweed The type of plant (pondweed) 25 20 15 10 faste st com faste faste st com faste st com Conclusion - Colourless light makes the plant photosynthesize fastest compared to the red, green and blue light