Photo referring to light.
Tropism referred to growth in response to light. Positive suggest that the growth is towards the light.
Light comes in from all direction therefore it will grow forwards.
If the light comes from the side (lateral) then the plants will bends in the growth towards the lights. (This is an example of positive tropism growth of the stems towards the lights) the light will then moves to the opposite side. This is know as auxin which causes more growth.
Try to break it down into bullet points for revuision purposes. but excellent work nevertheless
ReplyDelete