datalogger experiment_To see if the leaf needs carbon dioxide during photosynthesis (Woodlans Primary School)

MAterials : Leaf (From the Singapore sunflower) , datalogger, CO2 gas sensor connected to the datalogger, a glass bottle and last but not least, a light (lamp from IKEA)

First off we placed the leaf inside the bottle with the help of blue tac. Then Shalini (one of our group member) blew gently into the bottle. She produced CO2. Then we set the datalogger to 30 minutes. Then we placed the CO2 gas sensor on the tip of the bottle. Then we on the light.
_-_-_-_-_-_-_-_-_-_-_WAITING IN PROGRESS-_-_-_ -_-_-_-_-_-_-_
Then HORRAY!! We've got our results! We noticed that the graph (from the datalogger) first got higher (increase in carbon dioxide) then lower.(decrease in carbon dioxide) We can also see some water droplets in the bottle.
Carbon dioxide is needed during photosynthesis.
Conclusion: The amount of carbon dioxide decreased as the leaf is taking it in to make food.

Using Datalogger to measure the intake of carbon dioxide by plants 220409

Checking on our sunflower 150409

PBL activity -- Checking and Action (Woodlands Primary School)

We did some changes in our planning, we plucked out the leaves and made sure that the stem was of the same height. After the experiment, we got a blue and a little green colour in the rose. but the carnation only had blue coloured petals. The outcome of our prediction was wrong because it was suppose to be really half blue and half green, yet it is more blue than green (Rose). The carnation was only blue colour. To improve the experiment we must have petals of the same size, we should also have the same shade of dye.

Nicole and Yong Lin

Pictures of Expirment (Making a Flower have 2 colours) and observation of sunflower

Checking on our seedlings and start of PBL 010409

planting of sunflower seeds 250309