Answer to Question #225790 in Cell Biology for Naani

Question

Water potential is the pressure exerted by freely moving water molecules in a system. Describe the relationship between water potential with solute potential and pressure potential in plants.

Plant cell P has solute potential of -350kPa and pressure potential of 200kPa. Besides, is plant cell Q which has a solute potential of -500kPa and a pressure potential of 200kPa. Determine the direction of net movement of water between the two cells by using water potential equation.

Explain the characteristics of water that make it such an important medium for life. If an athlete was heavily perspiring after and intense match game, suggest one type of replacement drink ( with explanation) that he should take between hypertonic, Isotonic and hypotonic drink to recover himself. 

could you help me to answer this for 25 marks

Answer 1

Solute potential (Ψs) decreases with increasing solute concentration; a decrease in Ψs causes a decrease in the total water potential. The internal water potential of a plant cell is more negative than pure water; this causes water to move from the soil into plant roots via osmosis.

By convention, the water potential of pure water is given the value zero. Whenever a solute is added to water, there is a decrease in water potential.

Water potential is calculated by using the following formula -

Water potential (Ψ) = pressure potential $(Ψp)$ + solute potential (Ψs).

Thus, water potential for cell P is -350kPa and water potential of cell Q is -500kPa.

Water flows from a region of higher water potential to a region of lower water potential. In this case, water will flow from cell P, which has a water potential of -350kPa to cell Q, which has a water potential of - 500kPa.

As sweat evaporates from your skin, it removes heat from the body, but you also lose body fluid. So, you need to drink fluid during exercise to replace the fluids you lose when you sweat. That way, you'll reduce the risk of heat stress, maintain normal body function, and maintain performance levels.

Sports drinks often contain carbohydrate in the form of sugar, as well as electrolytes and minerals and sometimes protein, vitamins, or caffeine.