During grape ripening, which of the following occurs?

• A. Cells expand rapidly
• B. All of the above
• C. Sugar and water accumulate
• D. Acid levels fall

Answer: (B)

During grape ripening, several changes happen at the same time as the fruit matures. The berry grows as cells expand under turgor pressure and the cell walls loosen. At the same time, sugars accumulate because the fruit imports sugars from photosynthesis and converts them into soluble sugars, increasing sweetness. Water content also rises as the berry continues to take up water, contributing to both size and sugar concentration. Acidity decreases because the acids become diluted by the increasing juice volume and are metabolized or degraded. Taken together, these simultaneous changes mean that all of the listed effects occur during ripening, so the best interpretation is that all of the above happen.