Explain why xylem transport is unidirect | 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 14: Explain why xylem transport is unidirectional and phloem transport bi-directional.. 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 14: Explain why xylem transport is unidirectional and phloem transport bi-directional.
Answer:

During the growth of a plant, its leaves act as the source of food as they carry out photosynthesis. The phloem conducts the food from the source to the sink (the part of the plant requiring or storing food). During spring, this process is reversed as the food stored in the sink is mobilised toward the growing buds of the plant, through the phloem. Thus, the movement of food in the phloem is bidirectional (i.e., upward and downward).

The transport of water in the xylem takes place only from the roots to the leaves. Therefore, the movement of water and nutrients in the xylem is unidirectional.


Study Tips for Answering NCERT Questions:

NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

  • 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.
  • Practice answering questions within the time limit to improve your speed and accuracy.
  • Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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Comments

  • Prabal Das
  • Dec 04, 2018

Useless


  • mehdi
  • Jul 09, 2018

could you explain the food transportation from phloem to xylem?


  • Sundram
  • Sep 06, 2017

But during the transport of food, water is also moved towards the srorage bodies which can be root in Plants like beetroot.


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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 14: Explain why xylem transport is unidirectional and phloem transport bi-directional.....

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