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Explain pressure flow hypothesis of translocation of sugars in
Biology
Biology

Class 11

NCERT

Publisher:
NCERT
Subject:
Biology
1

Chapter 1: The Living World

11 questions

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2

Chapter 2: Biological Classification

12 questions

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3

Chapter 3: Plant Kingdom

12 questions

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4

Chapter 4: Animal Kingdom

15 questions

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5

Chapter 5: Morphology of Flowering Plants

15 questions

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6

Chapter 6: Anatomy of Flowering Plants

12 questions

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7

Chapter 7: Structural Organization in Animals

14 questions

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8

Chapter 8: Cell: The Unit of Life

14 questions

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9

Chapter 9: Biomolecules

15 questions

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10

Chapter 10: Cell Cycle and Cell Division

16 questions

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11

Chapter 11: Transport in Plants

16 questions

Q1
Explain why xylem transport is unidirectional and phloem transport bi-directional.
Q2
Explain pressure flow hypothesis of translocation of sugars in plants.
Q3
What causes the opening and closing of guard cells of stomata during transpiration?
View all question
12

Chapter 12: Mineral Nutrition

10 questions

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13

Chapter 13: Photosysnthesis in Higher Plants

9 questions

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14

Chapter 14: Respiration in Plants

12 questions

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15

Chapter 15: Plant Growth and Development

11 questions

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16

Chapter 16: Digestion and Absorption

15 questions

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17

Chapter 17: Breathing and Exchange of Gases

14 questions

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18

Chapter 18: Body Fluids and Circulation

14 questions

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19

Chapter 19: Excretory Products and their Elimination

12 questions

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20

Chapter 20: Locomotion and Movement

10 questions

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21

Chapter 21: Neural Control and Coordination

12 questions

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22

Chapter 22: Chemical Coordination and Integration

9 questions

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Question
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Solving time: 5 mins

Explain pressure flow hypothesis of translocation of sugars in plants.

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Updated on: Jan 23, 2023

Book

Book:

Biology (NCERT)

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The accepted mechanism used for the translocation of sugars from source to sink is called the pressure flow hypothesis. As glucose is prepared at the source i.e., in leaves, (by photosynthesis) it is converted to sucrose (a dissacharide). The sugar is then moved in the form of sucrose into adjacent companion cells and then into the living phloem i.e., in sieve tube cells by active transport. This process of loading at the source produces a hypertonic conditions in the phloem. Water in the adjacent xylem moves into the phloem by osmosis. As osmotic pressure builds up, the phloem sap will move to areas of lower pressure. At the sink, osmotic pressure must be reduced. Again active transport is necessary to move the sucrose out of the
phloem sap and into the cells which will use the sugar converting it into energy, starch, or cellulose. As sugars are removed, the osmotic pressure of the phloem decreases and water moves out of the phloem.
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Practice more questions from Biology (NCERT)

Q1
Explain why xylem transport is unidirectional and phloem transport bi-directional.
Q2
Explain pressure flow hypothesis of translocation of sugars in plants.
Q3
What causes the opening and closing of guard cells of stomata during transpiration?
View all

Practice questions from Biology (NCERT)

Question 1
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Differentiate between the following:
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(b) Transpiration and Evaporation
(c) Osmotic Pressure and Osmotic Potential
(d) Imbibition and Diffusion
(e) Apoplast and Symplast pathways of movement of water in plants.
(f) Guttation and Transpiration.
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Book:

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Question 2
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What causes the opening and closing of guard cells of stomata during transpiration?
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Transport in Plants

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Question 3
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What are the factors affecting the rate of diffusion?
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What are porins? What role do they play in diffusion?
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Practice more questions from Transport in Plants

Question 1
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Two living cells viz., RBC and a plant cell are kept in distilled water. The solute concentration is same in both the cells. What kind of changes can be observed in both the cells?
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  2. The RBC would increase in size and burst, while the plant cell would remain about the same size
  3. The plant cell would increase in size and burst, while the RBC would remain about the same size
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Question 2
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Guttation is the result of
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  2. transpiration
  3. osmosis
  4. root pressure.
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Question 3
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Epithem is associated with 
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  3. Transpiration
  4. Photosynthesis
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Question 4
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Two cell (A and B) have osmotic potential and pressure potential – 18 bars and 8 bars, and – 14 bars and 2 bars respectively. What will be the direction of water flow?
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Question Text
Explain pressure flow hypothesis of translocation of sugars in plants.
Updated OnJan 23, 2023
TopicTransport in Plants
SubjectBiology
ClassClass 11
Answer TypeText solution:1 Video solution: 1
Upvotes100
Avg. Video Duration3 min