The bottom driver is like the suspension for the sled, resulting in a smoother travel. And yes, the handles for the bottom athlete are significant too. The top man who sees the track signals the man in bottom (mostly using head movement) to help steer.
The two reactions which occur during photosynthesis are light  reaction and dark reaction. Light reaction takes place only in the  presence of light. Dark reaction can occur â¦ with or without light. 1 person found this useful.
Photosynthesis occurs in the chloroplasts (which contains the pigment chlorophyll) of the cells of green plants, and in one-celled autotrophs. More specifically, â¦ the chloroplasts contain stacks of disk-shaped thylakoids, within which the light-dependent reactions occur.