Two reasons: Aspirin has a direct potentially erosive effect on the stomach lining causing the lining to become inflamed , especially on an empty stomach and thus can contribute to creation or perpetuation of a breach in the stomach lining (an ulcer).
Photosynthesis is a process used by plants in which energy from sunlight is used to convert carbon dioxide and water into molecules needed for growth. These molecules include sugars, enzymes and chlorophyll.
Starch is a polymer made by plants to store energy. You see, plants need energy to grow and grow and grow. They use energy from sunlight to make a simple sugar, glucose. Plants make polymers-starch-out of extra glucose, so it's right there when they need it.