SpletAccording to the pressure flow hypothesis, food is prepared in the plant leaves in the form of glucose. Before moving into the source cells present in the phloem, the prepared food is converted into sucrose. Water moves from the xylem vessels into the adjacent phloem, thereby increasing the hydrostatic pressure in the phloem. SpletMass flow towards the sink.At sink sugars are unloaded and either used in respiration or stored as starch. The stomata on the leaves of pine trees are found in pits below the leaf surface. Explain how this helps to reduce water loss. Water vapour accumulates so diffusion gradient reduced so less water diffuses out of stomata.

AS Biology Paper 2 2024 Flashcards Quizlet

The pressure flow hypothesis, also known as the mass flow hypothesis, is the best-supported theory to explain the movement of sap through the phloem. It was proposed by Ernst Münch, a German plant physiologist in 1930. A high concentration of organic substances, particularly sugar, inside cells of the phloem at a source, such as a leaf, creates a diffusion gradient (osmotic gradient) that draws water into the cells from the adjacent xylem. This creates turgor pressure, also known … SpletCorrect option is A) Mass flow hypothesis is also known as pressure flow hypothesis. This theory was proposed by Ernst Munch. According to this theory, movement of sap through … lynne harper photography

Explain pressure flow hypothesis of translocation of sugars in …

SpletToday, we will see the mass flow hypothesis in detail. The accepted mechanism used for the translocation of sugars from source to sink is called the pressure... SpletThe mass flow hypothesis of translocation consists of three stages: organic compounds are loaded into the sieve tube elements in the leaves, resulting in an increase in hydrostatic pressure caused by osmotic influx the increase in hydrostatic pressure pushes the contents of the sieve tube elements down a pressure gradient organic compounds are … SpletMass flow hypothesis, also known as pressure-flow hypothesis, is an important theory of biology. It is mainly concerned with explanation of the movement of sap via phloem in a … lynne hamilton on the inside lyrics