When the adrenal gland is in a state, the amount of cortisol production drops below the normal level, and the amount of sugar available to the cells is reduced. With less sugar, less energy is available to the body, and fatigue is experienced.
The higher the temperature then typically the greater the rate of photosynthesis, photosynthesis is a chemical reaction and the rate of most chemical reactions increases with temperature. However, for photosynthesis at temperatures above 40Â°C the rate slows down.
The color or wavelength of light does affect photosynthesis, which is how plants can basically create their own food.Essentially, the reason why plants are green is they are absorbing the other wavelengths of light but reflecting back the green. The wikipedia page on photosynthesis goes into a lot more detail.