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.
All the reactions of photosynthesis that are directly dependent upon light are known as the light reactions. The light reactions occur in the part of the cell known as the thylakoids (Stacks of thylakoids are known as grana.). Many chlorophyll molecules are found embedded into the membranes of the thylakoids.