Pressure flow theory was formulated by
Correct answer: A. Ernst Munch
- A. Ernst Munch
- B. Charles Darwin
- C. Stocks
- D. Robert Hooke
Explanation
The pressure-flow hypothesis was formulated by Ernst Münch in 1930.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. Glucose generated by photosynthesis at the source is converted to sucrose which is moved to the phloem sieve tube cells through the companion cell by active transport. The remaining transport in the phloem is carried out by the differences in the osmotic pressure, which facilitates the transport from higher pressure to lower pressure regions of the sink. Again by active transport, the sucrose is transported from phloem to the cells of the sink where it will be stored for a long.
Last updated
About Circulation
The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.
Practise Circulation
695 free Circulation MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
1% of the absorbed water is used by plants in its activities during:
75% osmotic pressure of blood is maintained by:
A bottle filled with previously moistened mustard seeds and water was screw-capped tightly and kept in a corner. It blew up suddenly after about half an hour. The phenomenon involved is
A column of water within xylem vessels of tall trees does not break under its weight because of:
A destarched leaf on a potted plant was covered with Black (A) Transparent (B) strips of paper as shown in figure. After 6 hours of exposure to sunlight the leaf was removed from the plant and tested for starch. Which are the following will be the correct observation?