Class 11 Biology - Chapter Transport in Plants NCERT Solutions | Explain pressure flow hypothesis of tran
Explain pressure flow hypothesis of translocation of sugars in plants.
According 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. Consequently, the sucrose moves through the sieve cells of the phloem. The sucrose already present in the sink region is converted into starch or cellulose, thereby reducing the hydrostatic pressure in the sink cells. Hence, the pressure difference created between the source and the sink cells allows sugars to be translocated from the former to the latter. This starch or cellulose is finally removed from the sink cells through active transport.
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:- What are the factors affecting the rate of diffusion?
- Q:- What are porins? What role do they play in diffusion?
- Q:- Explain why pure water has the maximum water potential.Explain why pure water has the maximum water potential.
- Q:- Describe transpiration pull model of water transport in plants. What are the factors influencing transpiration? How is it useful to plants?
- 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?
- Q:- What happens when a pressure greater than the atmospheric pressure is applied to pure water or a solution?
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:- What are the different types of movements exhibited by the cells of human body?
- Q:- Write short notes on the following:
(a) Neural coordination
(b) Forebrain
(c) Midbrain
(d) Hindbrain
(e) Retina
(f) Ear ossicles
(g) Cochlea
(h) Organ of Corti
(i) Synapse - Q:- What is a flower? Describe the parts of a typical angiosperm flower?
- Q:- Why do we consider blood as a connective tissue?
- Q:-
Cell is the basic unit of life. Discuss in brief.
- Q:- What do the terms phycobiont and mycobiont signify?
- Q:-
Name two cell-organelles that are double membrane bound. What are the characteristics of these two organelles? State their functions and draw labelled diagrams of both.
- Q:- How are the minerals absorbed by the plants?
- Q:- Proteins have primary structure. If you are given a method to know which amino acid is at either of the two termini (ends) of a protein, can you connect this information to purity or homogeneity of a protein?
- Q:- Fill in the blanks:
Hormones Target gland
(a) Hypothalamic hormones __________________
(b) Thyrotrophin (TSH) __________________
(c) Corticotrophin (ACTH) __________________
(d) Gonadotrophins (LH, FSH) __________________
(e) Melanotrophin (MSH) __________________
10 Comment(s) on this Question
Nice explanation
Nice under standing answer
The same thing is there in our TB that us y we look out for better explaination ...but you not explained clearly
Good answer
Tq
Suck
It would e better if written in points.....
So nice
Wow
A wounderful explanation in a simple language easy to understand the concept
- All Chapters Of Class 11 Biology
- All Subjects Of Class 11