Find the best tutors and institutes for Class 11 Tuition
Q5(b):
Differentiate between the following:
(b) Transpiration and Evaporation
Solution :
1. Conceptual Definitions
Transpiration is defined as the biological process of water loss in the form of water vapor from the aerial parts of a living plant, primarily through the stomatal apertures, lenticels, and the cuticle [Per Plant Physiology: Mechanisms of Gas Exchange].
Evaporation is a physical process defined as the transition of liquid water to water vapor from any exposed surface (soil, water bodies, or inanimate objects) due to thermal energy gain, independent of biological control [Per Thermodynamics: Phase Transition].
2. Comparative Analytical Matrix
| Feature | Transpiration | Evaporation |
|---|---|---|
| Biological Nature | Biological (Active/Regulated) | Physical (Passive) |
| Site of Occurrence | Stomata, Cuticle, Lenticels | Any exposed free surface |
| Regulatory Control | Controlled by guard cells (Stomatal movement) | Uncontrolled; depends on ambient humidity and temperature |
| Turgidity | Affects plant turgor pressure | No impact on plant turgor |
3. Visual Representation of Mechanisms
4. Mechanistic Justification
- Regulatory Precision: Transpiration is governed by the $K^+$ ion transport mechanism in guard cells. When $K^+$ concentration increases, water enters the guard cells via osmosis, increasing turgor pressure and opening the stomata [Per the Stomatal Opening Theory].
- Entropy and Energy: Evaporation follows the kinetics of molecules escaping the liquid phase based on the average kinetic energy of the system ($KE = \frac{3}{2}kT$), requiring no specific cellular metabolic investment.
Final Solution: Transpiration is an active, physiologically regulated process occurring through specific plant apertures, whereas evaporation is a spontaneous, passive physical process occurring from any exposed surface influenced solely by environmental kinetic parameters.
More Questions from Class 11 Biology Transport in Plants EXERCISES
- Q1: What are the factors affecting the rate of diffusion?
- Q2: What are porins? What role do they play in diffusion?
- Q3: Describe the role played by protein pumps during active transport in plants.
- Q4: Explain why pure water has the maximum water potential.
- Q5(a): Differentiate between the following: (a) Diffusion and Osmosis
- Q5(c): Differentiate between the following: (c) Osmotic Pressure and Osmotic Potential
- Q5(d): Differentiate between the following: (d) Imbibition and Diffusion
- Q5(e): Differentiate between the following: (e) Apoplast and Symplast pathways of movement of water in plants.
- Q5(f): Differentiate between the following: (f) Guttation and Transpiration.
- Q6: Briefly describe water potential. What are the factors affecting it?
- Q7: What happens when a pressure greater than the atmospheric pressure is applied to pure water or a solution?
- Q8(a): (a) With the help of well-labelled diagrams, describe the process of plasmolysis in plants, giving appropriate examples.
- Q8(b): (b) Explain what will happen to a plant cell if it is kept in a solution having higher water potential.
- Q9: How is the mycorrhizal association helpful in absorption of water and minerals in plants?
- Q10: What role does root pressure play in water movement in plants?
- Q11: Describe transpiration pull model of water transport in plants. What are the factors influencing transpiration? How is it useful to plants?
- Q12: Discuss the factors responsible for ascent of xylem sap in plants.
- Q13: What essential role does the root endodermis play during mineral absorption in plants?
- Q14: Explain why xylem transport is unidirectional and phloem transport bi-directional.
- Q15: Explain pressure flow hypothesis of translocation of sugars in plants.
- Q16: What causes the opening and closing of guard cells of stomata during transpiration?
CBSE Solutions for Class 11 Biology Transport in Plants
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Structural Organisation in Animals
- Cell – The Unit of Life
- Biomolecules
- Cell Cycle and Division
- Mineral Nutrition
- Photosynthesis
- Respiration in Plants
- Plant Growth and Development
- Digestion and Absorption
- Breathing and Exchange of Gases
- Body Fluids and Circulation
- Excretory Products and Elimination
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
Top Tutors who teach Transport in Plants
Top Tutor
Narasapur, Gadag
10 yrs of
Exp
1 student
67 hrs of classes completed
350
per hour
Online Classes
I specialize in breaking down complex mathematical derivations, interpreting complex velocity-time or field graphs, and explaining the physical significance behind equations.Step-by-step algorithmic breakdown of complex integrals, visualizing 3D space geometries, and teaching the underlying logic of proofs.I break down intimidating, high-weightage topics into digestible sub-concepts. For example, before diving into complex Electromagnetic Induction problems, I ensure the student thoroughly grips Lenz's Law and magnetic flux concepts.
Top Tutor
Sun City Vistaar, Bareilly
10 yrs of
Exp
6 students
139 hrs of classes completed
500
per hour
Online Classes
I am teaching since 20011 of class 12th and 12 students. My subject of teaching is mathematics CBSC board.
Superb teaching with basic concept and core theory. His way of explanation is very nice. He teaches basics of mathematics very well.
Top Tutor
Vaishali Nagar, Jaipur
9 yrs of
Exp
9 students
3087 hrs of classes completed
600
per hour
Online Classes
As a certified and top-ranked tutor on UrbanPro with over 9 years of teaching experience, I specialize in guiding Class 11 students as they transition into the commerce stream. My strength lies in simplifying complex Accountancy concepts and building a strong foundational understanding. Backed by 7+ years of industry experience in Accounting, Auditing, and Taxation, I effectively bridge theoretical learning with real-world application. My goal is to make learning engaging, practical, and confidence-boosting, helping students not only excel in exams but also prepare for higher studies in commerce.
He is good teacher for study. He teach detailly about subject. His teach style is strict. But sometimes this style is good for students.
Top Tutor
Ottapalam, Ottapalam
8 yrs of
Exp
1 student
17 hrs of classes completed
400
per hour
Online Classes
Complete NCERT will be taught ... Doubt sessions will be provided
Very friendly, we understood very easily the way he is explaining. Put outstanding efforts on students, give weekly/monthly test and give a support to our life. It is the best opportunity to learn. Thank you sir.
Top Tutor
Mathara, Kozhikode
12 yrs of
Exp
3 students
921 hrs of classes completed
700
per hour
Online Classes
I can explain the concepts with clarity. I focus on solving numerical problems in Physics so that a student can learn better.
