"Photoperiodism," Lily whispered, remembering her textbook. The sprout paused. It seemed to consider the word. Then, a tiny leaf unfurled, and on its surface, shimmering text appeared: Slide 1: Not just light, but the memory of light. Plants count the dark hours.
Pip breaks through the surface! For the first time, he feels the warmth of the sun. He unfolds two tiny green leaves and takes his first "breath" of fresh air. plant growth and development ppt download top