The biosphere is the portion of the earth where all living organisms can be found.
The hydrosphere refers to the water on the earth crust.
If there were no hydrosphere, life would not have evolved. Liquid water is a major component of all life. It is essential for metabolic processes in both plant and animals and a host of other activities.
The hydrosphere provides water that is a major component of the soil. Plants grow on the soil. Soil water is one of the most important component of the soil.
The hydrosphere made the earth a unique planet where life can be domiciled.