The plant detects the substance and activates an internal signal that causes it to lose its greencolour, turning its leaves white.
当植物监测到那些有害物品时就会激发内信号，使叶子从绿色变成白色。
3
During photosynthesis, leaves have to produce chlorophyll to capture the energy from the sun, and it is this chlorophyll that gives them their greencolour.