Question

Describe how increasing salinity affects the amount of fluid ejected each time a contractile vacuole contracts. Calculate the water potential ( Ψ ) of an animal cell without contractile vacuoles if water enters the cell and creates a solute potential ( ΨS ) of −2 . Assume that the pressure potential ( ΨP ) in the cell is 0.

Answer 1

Answer:

Water potential $= -2$

Explanation:

As we know,

Water potential is equal to the sum of pressure potential and solute potential

Ψ $=$ ΨS $+$ ΨP

Where Ψ is the water potential

ΨS is the solute potential

ΨP is the pressure potential

Given -

Solute potential ( ΨS ) $= -2$

Pressure potential ( ΨP ) $= 0$

Substituting the given values, we get -

Ψ $=$ $- 2 + 0$

Ψ $=$ $- 2$

Answer 2

(a) Increased salinity will affect the amount of fluid ejected each time a contractile vacuole contracts because the surrounding water becomes more hypertonic as salinity increases.

As hypertonicity of the surrounding medium increases, water potential decreases, and more water will be ejected from the contractile vacuole to the surrounding medium as a result of osmosis.

(b) From the formula:

water potential ( Ψ ) = solute potential  ( ΨS ) + pressure potential ( ΨP )

In this case, ΨS= -2 and ΨP = 0

Therefore:

              Ψ = -2 + 0

                       = -2

Thus, the water potential of the animal cell without contractile vacuoles if water enters the cell and creates a solute potential ( ΨS ) of −2 would be -2.

More on osmosis and water potential can be found here: https://brainly.com/question/3455136