What problem occurs if a sudden black boundary is drawn between light and shadow on a round fruit?

Correct answer: The fruit may look flat or hard

The governing concept is gradual tonal modelling on rounded forms. On a fruit, light normally changes progressively across the curved surface, although a terminator may indicate where direct light gives way to form shadow. Drawing that transition as a sudden black outline separates the tones unnaturally, making the fruit appear flat, hard, or cut out. It does not make the fruit transparent, improve composition balance, or shorten the cast shadow.