Munch explained the translocation of the organic food material through the phloem tissue. This flow occurs along the gradient of the turgor pressure from a region of higher solute concentration to a region of lower solute concentration.

So option B is correct.

The Munch hypothesis is based on translocation of food due to turgor pressure gradient.

Translocation is the process by which sugars and other organic nutrients are transported from the leaves to the other parts of the plant, such as the roots, stems, and developing fruits. The Munch hypothesis, proposed by Ernst Munch in 1930, explains the mechanism of translocation in plants.

Translocation due to turgor pressure gradient:
According to the Munch hypothesis, translocation of food in plants occurs due to the movement of sugars from source to sink through a pressure flow mechanism. The source refers to the region where sugars are produced, usually the leaves, and the sink refers to the region where sugars are utilized or stored, such as the roots or developing fruits.

The movement of sugars in the phloem tissue is driven by a pressure gradient. The source region has high sugar concentration, which creates a high osmotic pressure. This high pressure causes water to enter the phloem sieve tubes by osmosis, resulting in an increase in turgor pressure.

Translocation process:
Here is a step-by-step explanation of the translocation process based on the Munch hypothesis:

1. Sugar production: During photosynthesis, sugars (primarily sucrose) are produced in the leaves. These sugars are actively loaded into the phloem sieve tubes by companion cells.

2. Pressure gradient: The high sugar concentration in the sieve tubes creates a high osmotic pressure. Water from the xylem tissue enters the sieve tubes by osmosis, increasing the turgor pressure.

3. Mass flow: The high turgor pressure in the source region forces the sugar solution to flow towards the sink region, where sugar is utilized or stored. This mass flow occurs through the sieve tubes of the phloem.

4. Sugar unloading: In the sink region, sugars are actively unloaded from the phloem sieve tubes and utilized for various metabolic processes or stored as starch.

5. Water reabsorption: Water moves out of the phloem sieve tubes back into the xylem tissue, completing the translocation process.

Imbibition force and other options:
The Munch hypothesis is specifically based on the translocation of food due to the turgor pressure gradient and does not involve imbibition force. Imbibition is the process by which water is absorbed by substances such as cell walls, causing them to swell. While imbibition is an important process in plant cells, it is not directly related to the translocation of food.

Therefore, the correct answer is option 'B' - Translocation of food due to turgor pressure gradient. The Munch hypothesis explains the translocation of food in plants based on this mechanism.