Describe an experiment to show that photosynthesis can only take place in the presence of chlorophyll. (An illustrated diagram is required) – NABTEB QUESTION

Description of the Experiment:

1. Collect a variegated leaf
2. illuminated for about 4 to 6 hours
3. from a healthy growing acalypha/croton/ice plant/calladium plant
4. map the leaf/draw the leaf and label the different coloured areas.
5. treat/prepare the leaf for starch test
6. spread iodine solution on the leaf
7. compare/match the leaf with the map.

Result:

1. Green area stained black/blue black
2. Other coloured areas/white/red/yellow stained brown or yellow.

Conclusion:

1. Green areas contain chlorophyll, carried out photosynthesis, therefore stained black.
2. yellow/white/red areas contained no chlorophyll, did not photosynthesize, stained yellow or brownish.
3. photosynthesis takes place only in the presence of chlorophyll.