Osmoscope is used for
A.Measuring OP
B.Measuring TP
C. Measuring psi
D.Demonstration of osmosis.

Hint: Osmoscope is an instrument that is used in a process related to water movement through a semipermeable membrane from a higher concentration level to a lower concentration level.

Complete answer:
The flow of water from high concentration to low concentrations through a semipermeable membrane is called osmosis which can be determined by an instrument known as an osmoscope.
Osmotic pressure is defined as the minimum pressure required to stop the flow of pure solvent along the semipermeable membrane.
A simple potato osmoscope can be easily made at home or laboratory, a part of the potato is removed to form a cavity in the potato and a sugar solution is poured into the cavity and the potato is then kept in water, After some time the level of the solution in cavity increases due to osmosis, In this way osmosis can be easily demonstrated.

Option A: Osmotic potential is measured with the help of thermocouple psychrometry. Therefore, this is the incorrect option.

Option B: Turgor pressure can be measured by a pressure probe or an osmometer. Therefore, this is the incorrect option.

Option C: psi is measured by pressure measuring instruments. Therefore, this is the incorrect option.

Option D: Osmoscope is an instrument which can be used to demonstrate how osmosis takes place, Therefore, this is the correct option.

Hence, the correct answer is option (D)

Note: The flow of water in osmosis will take place in two solutions which are of different concentrations and it will stop when equilibrium is reached in the solution. Osmoscope can be made using potatoes, by carving a cave in it and pouring sugar solution in the cavity. After sometime, one can see the level of water increases because water from the nearby cells also enters the cavity.