Explain pressure flow hypothesis of tran | Class 11 Biology Chapter Transport in Plants, Transport in Plants NCERT Solutions

Previous / historical NCERT chapter

This chapter belongs to a previous NCERT/CBSE curriculum and is not part of the current 2026-27 chapter list. Removed in 2022-23.

Welcome to the NCERT Solutions for Class 11 Biology - Chapter Transport in Plants. This page offers a step-by-step solution to the specific question from Exercise 1, Question 15: Explain pressure flow hypothesis of translocation of sugars in plants.. With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 15: Explain pressure flow hypothesis of translocation of sugars in plants.
Answer:

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.

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  • Read the question carefully and focus on the core concept being asked.
  • Reference examples and data from the chapter when answering questions about Transport in Plants.
  • Review previous year question papers to get an idea of how such questions may be framed in exams.
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Comments

  • Raks
  • Nov 21, 2019

Nice explanation

  • Nandini
  • Sep 03, 2019

Nice under standing answer

  • Ruuu
  • Jul 04, 2019

The same thing is there in our TB that us y we look out for better explaination ...but you not explained clearly

  • Tabrej
  • Mar 08, 2019

Good answer

  • Vaishnavi
  • Mar 07, 2019

Tq

  • Suck
  • Feb 15, 2019

Suck

  • Alka
  • Jan 10, 2019

It would e better if written in points.....

  • Ayush
  • Dec 27, 2018

So nice

  • Ayush
  • Dec 27, 2018

Wow

  • Raman
  • Dec 04, 2018

A wounderful explanation in a simple language easy to understand the concept

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Welcome to the NCERT Solutions for Class 11 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 15: Explain pressure flow hypothesis of translocation of sugars in plants.....

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