The diagram shows the steps involved in a practical that is set up to find whether photosynthesis has taken place or not. This was done by testing a soft green leaf from a geranium plant for starch. The test was done following three major steps, destarching the plant, ensuring that the palnt is completely destarched by using one of the leaves, allowing the leaf to photosynthesise and produce starch and lastly, re-testing a leaf for starch. What is the name of the process by which a plant is deprived of starch?