2.81

objective 2.81 : describe posotive phototropism of stems




phototropism= growth in responce to light

posotive phototropism= growth towards light

if a stem's tip is exposed to uniform light (light from all directions) the stem will grow upwards

if the light source is from the side the tip will grow towards the light
this is an exaple of posotive phototropism of the stem

light on one side causes the hormone AUXIN on the other side to grow sideways towards the light. this is how the stem grows sideways.