Question

Frog eggs in the pond do not burst because

A. There is no net osmotic pressure across their plasma membrane.
B. The ion concentrations inside the eggs are roughly the same as the pond water.
C. There is no aquaporin on the plasma membrane of eggs.
D. There is a higher glucose concentration inside eggs.

Answer 1

Frog eggs in the pond do not burst because there is no net osmotic pressure across their plasma membrane. option A is correct.

Step-by-step explanation:

The osmotic stability of cells, such as frog eggs, is crucial for maintaining their integrity in different environments.

Option A (Correct): The absence of a net osmotic pressure across the plasma membrane means that there is an equilibrium of solute concentrations between the interior of the frog eggs and the pond water. This prevents water from moving into or out of the eggs, ensuring stability.

Option B: While having similar ion concentrations inside the eggs and pond water contributes to osmotic balance, it is the absence of a net osmotic pressure that prevents bursting.

Option C: The presence or absence of aquaporins is more related to the movement of water molecules rather than osmotic pressure.

Option D: Glucose concentration is not typically a major factor in osmotic stability for frog eggs.

Understanding osmotic principles helps explain how cells maintain their structural integrity in different external environments.

Option A is the answer.