Question

Ernst Munch proposed the

• A. pressure flow hypothesis
• B. mass flow hypothesis
• C. bulk flow hypothesis
• D. all the above

Answer 1

The correct option is D all the above

Ernst Munch proposed the pressure flow hypothesis, also known as the mass flow or bulk flow hypothesis. This is the accepted mechanism used for the translocation of sugars from source to sink. According to this hypothesis, the movement of substances occur in bulk and the organic substances move from a region of high osmotic pressure to the region of low osmotic pressure due to the development of a pressure potential gradient. The transport occurs through the phloem.