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 â Light Reactions â¢ The Light Reactions occur only in presence of Light. â¢ And take place in Thylakoid / Grana .â¢ The pigment/enzyme systems in grana split H2O molecules into 2H+ and 2e-and Oxygen by using the energy of sunlight. 2 oxygen atoms combine and form O2. The chloroplasts release O2 into environment.