Biology · Textbook solutions

Plant Water Relation

Every solved example, exercise, and miscellaneous question, in the order the textbook teaches them. Plus every board question asked from this chapter. · 34 questions

Exercise

34 q

Q1. Multiple Choice Questions

Practice · 10

Multiple Choice Questions
Ex Q1(1) $In soil, water available for absorption by root is ...................$
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Ex Q1(2) $The most widely accepted theory for ascent of sap is ..............$
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Ex Q1(3) $Water movement between the cells is due to .............$
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Ex Q1(4) $In guard cells, when sugar is converted into starch, the stomatal pore ............$
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Ex Q1(5) $Surface tension is due to ..............$
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Ex Q1(6) $Which of the following type of solution has lower level of solutes than the solution?$
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Ex Q1(7) $During rainy season wooden doors warp and become difficult to open or to close because of ...............$
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Ex Q1(8) $Water absorption takes place through .............$
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Ex Q1(9) $Due to low atmospheric pressure the rate of transpiration will ............$
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Ex Q1(10) $Osmosis is a property of .................$
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Q2. Very short answer questions

Practice · 9

Very short answer questions.
Ex Q2(1) $What is osmotic pressure?$
Ex Q2(2) $Name the condition in which protoplast of the plant cell shrinks.$
Ex Q2(3) $What happens when a pressure greater than the atmospheric pressure is applied to pure water or a solution?$
Ex Q2(4) $Which type of solution will bring about deplasmolysis?$
Ex Q2(5) $Which type of plants have negative root pressure?$
Ex Q2(6) $In which conditions transpiration pull will be affected?$
Ex Q2(7) $Mention the shape of guard cells in Cyperus .$
Ex Q2(8) $Why do diurnal changes occur in osmotic potential of guard cells?$
Ex Q2(9) $What is symplast pathway?$

Q3. Answer the following questions

Practice · 10

Answer the following questions.
Ex Q3(1) $Describe mechanism for absorption of water.$
Ex Q3(2) $Discuss theories of water translocation.$
Ex Q3(3) $What is transpiration? Describe mechanism of opening and closing of stomata.$
Ex Q3(4) $What is transpiration? Explain role of transpiration.$
Ex Q3(5) $What is significance of transpiration? Explain root pressure theory and its limitations.$
Ex Q3(6) $Explain capillarity theory of water translocation.$
Ex Q3(7) $Why is transpiration called ‘a necessary evil’?$
Ex Q3(8) $Explain movement of water in the root.$
Ex Q3(9) $Define and or explain the terms: Osmosis, diffusion, plasmolysis, imbibition, guttation, transpiration, ascent of sap, active absorption, DPD, turgor pressure, water potential, wall pressure, root pressure.$
Ex Q3(10) $Distinguish between a) Osmotic pressure and turgor pressure b) Diffusion and osmosis.$

Q4. Long answer questions

Practice · 5

Long answer questions.
Ex Q4(1) $Describe structure of root hair.$
Ex Q4(2) $Write on journey of water from soil to xylem in roots.$
Ex Q4(3) $Explain cohesion theory for translocation of water.$
Ex Q4(4) $Write on the mechanism of opening and closing of stoma.$
Ex Q4(5) $Explain the active absorption of minerals.$

What the board has asked from this chapter

Questions per paper · 5 papers · 2024 to 2026

June 2026

4 q

Q. 1(iii) $When food is translocated from phloem to pith, it is called _____ translocation.$
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Transport of Food
Q. 2(iii) $When turgor pressure is equal to wall pressure of a turgid cell, then what would be the diffusion pressure deficit?$
Absorption of Water by Roots from Soil
Q. 3 $Give the properties of water.$
Properties of Water
Q. 19 $With the help of a labelled diagram, describe the structure of root-hair.$
Water Absorbing Organ

February 2026

4 q

Q. 1(vi) $In plants, soluble food is always translocated in the form of _____.$
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Transport of Food
Q. 2(vii) $Define combined water.$
Water Available to Roots for Absorption
Q. 12 $Mention any four factors affecting water absorption.$
Absorption of Water by Roots from Soil
Q. 19 $What is transpiration? Explain stomatal opening and closing mechanism with reference to starch-sugar interconversion theory.$
Transpiration

July 2025

3 q

Q. 2(ii) $Name the process in which swelling of hydrophilic colloids occur due to adsorption of water.$
Absorption of Water by Roots from Soil
Q. 9 $Draw a neat diagram of structure of root hair showing vacuole, mitochondria and nucleus.$
Water Absorbing Organ
Q. 30 $What is transpiration? Draw well labelled diagram showing structure of stomatal apparatus in dicotyledons? Mention any three advantages of transpiration.$
Transpiration

July 2024

3 q

Q. 1(vi) $Value of root pressure is +1 to +2 bars which is enough to pump water to a height of ______.$
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Translocation of Water
Q. 7 $What is radial and tangential translocation of food in plants?$
Transport of Food
Q. 27 $Describe mechanism of opening and closing of stomata with reference to : (a) Starch-sugar interconversion theory (b) Proton transport theory$
Structure of Stomatal Apparatus

March 2024

3 q

Q. 9 $Identify and define ‘A’ and ‘B’ in relation to uptake of water by the root :$
Path of Water Across the Root
Q. 11 $Explain factors affecting water absorption.$
Water Potential
Q. 21 $What are the limitations of root pressure theory?$
Translocation of Water

Plant Water Relation

Exercise

Q1. Multiple Choice Questions

Q2. Very short answer questions

Q3. Answer the following questions

Q4. Long answer questions

What the board has asked from this chapter

June 2026

February 2026

July 2025

July 2024

March 2024

The 10 board questions to practise first

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10