Class 11 Biology - Chapter Transport in Plants NCERT Solutions | Explain the mass flow hypothesis of tran
Welcome to the NCERT Solutions for Class 11th Biology - Chapter Transport in Plants. This page offers a step-by-step solution to the specific question from Excercise 0 , Question 23: explain the mass flow hypothesis of transport in p....
Question 23
Explain the mass flow hypothesis of transport in phloem.
Answer
Mass flow hypothesis is also known as the press flow hypothesis. It was proposed by Munch in 1930 and it is accepted as most scientific. It states that when there is a high concentration of sugar present in the source then a diffusion gradient gets created between the sugar source and the sugar shrink where the sugar is stored. As the pressure is involved and movement of substance takes place in bulk thus this is called Mass Flow hypothesis or Pressure Flow hypothesis.
More Questions From Class 11 Biology - Chapter Transport in Plants
- Q:- Explain why xylem transport is unidirectional and phloem transport bi-directional.
- Q:- (a) With the help of well-labelled diagrams, describe the process of plasmolysis in plants, giving appropriate examples.
(b) Explain what will happen to a plant cell if it is kept in a solution having higher water potential. - Q:- What role does root pressure play in water movement in plants?
- Q:- Explain pressure flow hypothesis of translocation of sugars in plants.
- Q:- What are the factors affecting the rate of diffusion?
- Q:- What are porins? What role do they play in diffusion?
- Q:- Describe transpiration pull model of water transport in plants. What are the factors influencing transpiration? How is it useful to plants?
- Q:- Explain why pure water has the maximum water potential.Explain why pure water has the maximum water potential.
- Q:- Briefly describe water potential. What are the factors affecting it?
- Q:- What causes the opening and closing of guard cells of stomata during transpiration?
Popular Questions of Class 11 Biology
- Q:- Why are living organisms classified?
- Q:- Discuss how classification systems have undergone several changes over a period of time?
- Q:- What is the basis of classification of algae?
- Q:- What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?
- Q:- What is meant by modification of root? What type of modification of root is found in the (a) Banyan tree (b) Turnip (c) Mangrove trees
- Q:- State the location and function of different types of meristem.
- Q:- Answer in one word or one line. (i) Give the common name of Periplaneta americana. (ii) How many spermathecae are found in earthworm? (iii) What is the position of ovaries in the cockroach? (iv) How many segments are present in the abdomen of cockroach? (v) Where do you find malphigian tubules?
- Q:-
Which of the following is not correct?
(a) Robert Brown discovered the cell.
(b) Schleiden and Schwann formulated the cell theory.
(c) Virchow explained that cells are formed from pre-existing cells.
(d) A unicellular organism carries out its life activities within a single cell. - Q:- What are macromolecules? Give examples.
- Q:- What is the average cell cycle span for a mammalian cell?
Recently Viewed Questions of Class 11 Biology
- Q:- Why is not any one parameter good enough to demonstrate growth throughout the life of a flowering plant?
- Q:- How does cytokinesis in plant cells differ from that in animal cells?
- Q:- Name the three basic tissue systems in the flowering plants. Give the tissue names under each system.
- Q:- What is the significance of juxtaglomerular apparatus (JGA) in kidney function?
- Q:- Fill in the blank spaces:
(a) All mammals (except a few) have __________ cervical vertebra.
(b) The number of phalanges in each limb of human is __________
(c) Thin filament of myofibril contains 2 F actins and two other proteins namely __________ and __________.
(d) In a muscle fibre Ca++ is stored in __________
(e) __________ and __________ pairs of ribs are called floating ribs.
(f) The human cranium is made of __________ bones. - Q:- By looking at a plant externally can you tell whether a plant is C3 or C4? Why and how?
- Q:- Distinguish between intracellular and extracellular digestion?
- Q:- What do the terms phycobiont and mycobiont signify?
- Q:- Define
(a) Growth
(b) Differentiation
(c) Development
(d) De differentiation
(e) Re differentiation
(f) Determinate growth
(g) Meristem
(h) Growth rate. - Q:-
State the role of pancreatic juice in digestion of proteins.
- All Chapters Of Class 11 Biology
- All Subjects Of Class 11