In Class 11 Final Exams there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Download of CBSE Class 11 Biology Chapter 11 Case Study and Passage Based Questions with Answers were Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 11 Biology Transport in Plants to know their preparation level.

In CBSE Class 11 Biology Paper, There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Transport in Plants Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 11 Biology Chapter 11 Transport in Plants

Case Study/Passage-Based Questions

Case Study 1:

Transpiration is the evaporative loss of water by plants. It occurs mainly through stomata. Besides the loss of water vapour in transpiration, exchange of oxygen and carbon dioxide in the leaf also occurs through these stomata. Normally stomata are open in the day time and close during the night. The immediate cause of the opening or closing of stomata is a change in the turgidity of the guard cells.

Transpiration is affected by several external factors: temperature, light, humidity, wind speed. Plant factors that affect transpiration include number and distribution of stomata, per cent of open stomata, water status of the plant, canopy structure etc.

The transpiration driven ascent of xylem sap depends mainly on the following physical properties of water:

Cohesion – mutual attraction between water molecules.

Adhesion – attraction of water molecules to polar surfaces.

Surface Tension – water molecules are attracted to each other in the liquid phase more than to water in the gas phase

These properties give water high tensile strength, i.e., an ability to resist a pulling force, and high capillarity, i.e., the ability to rise in thin tubes. In plants capillarity is aided by the small diameter of the tracheary elements – the tracheids and vessel elements. The process of photosynthesis requires water. The system of xylem vessels from the root to the leaf vein can supply the needed water. As water evaporates through the stomata, since the thin film of water over the cells is continuous, it results in pulling of water, molecule by molecule, into the leaf from the xylem. Also, because of lower concentration of water vapour in the atmosphere as compared to the substomatal cavity and intercellular spaces, water diffuses into the surrounding air. This creates a ‘pull’. Measurements reveal that the forces generated by transpiration can create pressures sufficient to lift a xylem sized column of water over 130 metres high.

1.) ________________ is the site for gaseous exchange and evaporation of water in the form of vapours i.e. transpiration.

• a) Leaf
• b) Leaf surface
• c) Stomata
• d) All of the above

Ans: c) Stomata

2.) Hydrophilic mutual attraction between water molecules is termed as,

• a) Cohesion
• b) Adhesion
• c) Surface tension
• d) Both a and c

Ans: a) Cohesion

3.) Identity the correct statement

Statement 1 – Cohesion is mutual attraction between water molecules.

Statement 2 – Adhesion is attraction of water molecules to polar surfaces.

Statement 3 – Transpiration is the evaporative loss of water by plants.

Statement 4 – water molecules are attracted to each other in the liquid phase more than to water in the gas phase

• a) Only 1
• b) Only 2
• c) Only 3 & 4
• d) All of the above

Ans: d) All of the above

4.) What is the reason behind immediate opening or closing of stomata?

Ans: The reason behind immediate opening or closing of stomata is the turgidity of the guard cells. A change in the turgidity of the guard cells cause immediate opening or closing of stomata.

5.) Enlist the properties that give water high tensile strength.

Ans: Properties that give water high tensile strength;

• Cohesion
• Adhesion
• Surface Tension

6.) Define cohesion and adhesion.

Ans:Cohesion – is defined as the hydrophilic mutual attraction between water molecules.

Adhesion – is defined as attraction of water molecules to polar surfaces.

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