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Briefly describe water potential. What are the factors affecting it?

Briefly describe water potential. What a | Class 11 Biology Chapter Transport in Plants, Transport in Plants NCERT Solutions

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 6: . 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 6: Briefly describe water potential. What are the factors affecting it?

Answer:

Water potential quantifies the tendency of water to move from one part to the other during various cellular processes such as diffusion, osmosis, etc. It is denoted by the Greek letter Psi or Ψ and is expressed in Pascals (Pa). The water potential of pure water is always taken as zero at standard temperature and pressure.

Water potential (Ψw) is expressed as the sum of solute potential (Ψs) and pressure potential (Ψp).

Ψw = Ψs + Ψp

When some solute is dissolved in water, the water potential of pure water decreases. This is termed as solute potential (Ψs), which is always negative. For a solution at atmospheric pressure, Ψw = Ψs.

The water potential of pure water or a solution increases on the application of pressure values more than atmospheric pressure. It is termed as pressure potential. It is denoted by Ψp and has a positive value, although a negative pressure potential is present in the xylem. This pressure potential plays a major role in the ascent of water through the stem.

Other Questions of Chapter Transport in Plants

In a plant, tranalocation in xylem is unidirectional while in phloem it is bidirectional. Explain.

How does water moves within the root?

Differentiate between Apoplast and Symplast pathways of water movement. Which of these would need active transport?

Explain the mass flow hypothesis of transport in phloem.

Q: What are the factors affecting the rate of diffusion?

The radio labelled carbon in carbon dioxide supplied to potato plants in an experiment was seen in the tuber eventually. Trace the movement
of the labelled carbon dioxide.

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

Plants show temporary and permanent wilting. Differentiate between the two. Do any of them indicate the water status of the soil?

Q: What role does root pressure play in water movement in plants?

Q: Describe transpiration pull model of water transport in plants. What are the factors influencing transpiration? How is it useful to plants?

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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

megha verma
Jan 30, 2020

your questions are good and answers are also well defined

Prittam
Nov 09, 2018

Very good answer