default_background
✕

Find the best tutors and institutes for Class 11 Tuition

Find Best Class 11 Tuition

Please select a Category.

Please select a Locality.

No matching category found.

No matching Locality found.

Q8(a):
(a) With the help of well-labelled diagrams, describe the process of plasmolysis in plants, giving appropriate examples.

Solution :

1. Theoretical Foundation of Plasmolysis

Plasmolysis is the process of shrinkage of the protoplast of a plant cell when it is placed in a hypertonic solution. This phenomenon occurs due to the exosmosis of water from the cell sap into the surrounding medium, leading to a loss of turgor pressure [Per the Principle of Osmosis: water moves from a region of higher water potential ($\psi_w$) to a region of lower water potential across a semi-permeable membrane].

2. The Process Sequence

  • Step A (Isotonic/Initial State): The cell is in a state of flaccidity or near-equilibrium where the water potential inside is equivalent to the surroundings.
  • Step B (Exosmosis): Upon exposure to a hypertonic solution (higher solute concentration, lower $\psi_w$), water molecules exit the vacuole and cytoplasm through the plasma membrane.
  • Step C (Plasmolysis): The protoplast pulls away from the cell wall. The space between the cell wall and the plasma membrane becomes filled with the external hypertonic solution.
  • Step D (Limiting Plasmolysis): The cell reaches a state where the plasma membrane just detaches from the cell wall.

3. Visual Representation of Plasmolysis

Turgid Cell Plasmolysed Cell Cell Wall Shrunken Protoplast

4. Comparative Analysis Table

Parameter Turgid Cell Plasmolysed Cell
Protoplast Status Pressed against cell wall Detached from cell wall
Water Movement No net movement Exosmosis (Outward)
Turgor Pressure Positive/Maximum Zero/Negative

5. Biological Examples & Evidence

The most classic academic demonstration of plasmolysis involves the use of Rhoeo discolor (Moses-in-the-cradle) leaf epidermis. When the epidermal peel is mounted in a $10\%$ sucrose or $0.5M$ $NaCl$ solution, the anthocyanin-containing cells allow for easy observation of the collapsing vacuole and separating plasma membrane under a light microscope.

Clinical/Practical Significance: Plasmolysis is a critical mechanism in food preservation. By adding high concentrations of salt or sugar to fruits or meat, we create a hypertonic environment that induces plasmolysis in bacterial cells contaminating the food, effectively dehydrating them and preventing microbial proliferation [Mechanism: Inhibition of metabolic enzymes due to critical water loss].

Final Solution: Plasmolysis is the irreversible (unless followed by deplasmolysis) retraction of the plant protoplast from the cell wall due to water loss in a hypertonic medium, serving as a fundamental evidence of the semi-permeable nature of the plasma membrane.


More Questions from Class 11 Biology Transport in Plants EXERCISES


CBSE Solutions for Class 11 Biology Transport in Plants


Chapters in CBSE - Class 11 Biology


Top Tutors who teach Transport in Plants

Avishake Chatterjee Class 11 Tuition trainer in Kolkata
(63)
Top Tutor
locationImg Behala, Kolkata
experience 6 yrs of Exp students 4 students
greenClock 1162 hrs of classes completed
rsIcon 1000 per hour
MATHS EXPERT having an experience of 6+years
Online Classes Online Classes
homeTutions Student's Home
regularClasses Tutor's home

As a passionate mathematics teacher, I have always enjoyed imparting knowledge to others. I am a B.Tech graduate in Electronics and Communication. I have been teaching mathematics for over four years, and my love for the subject has grown stronger with time. I started teaching as a part-time tutor while pursuing my engineering degree and fell in love with the profession. After completing my degree, I worked with Byjus, one of the leading Edtech companies in India, as a mathematics teacher for two years. While I enjoyed my time at Byju's, I could do more as a teacher and wanted to explore new avenues. I joined Vedantu, an online learning platform, where I have been teaching mathematics for the last two years. I started my journey as a math teacher out of pure passion. Mathematics has always been my favourite subject, and I enjoyed solving problems and equations from a young age. As I grew older, I realised I had a natural talent for teaching, and I decided to pursue it as a career. Currently, I provide mathematics classes for students from sixth to twelfth for all boards, including ICSE, CBSE, and West Bengal. I teach offline and online classes, each lasting for one and a half hours. I use interactive tools such as Zoom, Pentab, and One Note to make my lessons engaging and interactive for my students. To help my students excel in mathematics, I provide them with reference books, notes, and in-built assignments to test their knowledge. I also conduct monthly tests to assess their progress and identify improvement areas. Teaching on UrbanPro has allowed me to interact with students from different parts of the country and help them realise their full potential in mathematics. I want to continue making a positive impact in the lives of my students and help them develop a love for mathematics, just like I did

Tamanna

Sirs class is very interactive, explains each topic in detail making it crystal clear for the student to understand and learn. Always approachable and is ready to clear doubts anytime.

Skills: Mathematics
Also teaches: Class 10 Tuition, Class I-V Tuition and more

(13)
Top Tutor
locationImg Ramachandra Puram, Hyderabad
experience 10 yrs of Exp students 4 students
greenClock 250 hrs of classes completed
rsIcon 400 per hour
Accountancy for Class 11 & 12 | Strong Basics | Smart Practice | Better Scores
Online Classes Online Classes
homeTutions Student's Home

I am an experienced academic teacher and tutor, specialised in teaching Accountancy to Class 11 students. My teaching approach focuses on building strong fundamentals, simplifying complex chapters and explaining practical problems step by step and making learning engaging and effective. Through interactive teaching, personalised attention and exam-oriented practice, I help students prepare effectively and perform well in their exams.

Nakshatra reddy

He teaches really well so that we can understand the concept.His concept understanding is very good.

Skills: Accountancy , Accounting and more
Also teaches: Class 12 Tuition, CA Coaching

(22)
Top Tutor
locationImg Maan, Pimpri-Chinchwad
experience 10 yrs of Exp students 1 student
greenClock 263 hrs of classes completed
rsIcon 1200 per hour
A friendly and passionate tutor with over 8 years of experience.
Online Classes Online Classes
homeTutions Student's Home
regularClasses Tutor's home

I have been teaching students for the past 6 years and have guided many to students in getting excellent results, showcasing their best performance. Concept-based teaching and an extra emphasis on every student needs has helped me provide a quality teaching environment to my students.

Rupesh

He is one of those teachers who always helps his students with all his doubts even if it is out of syllabus.

Also teaches: Class 12 Tuition, NEET-UG Coaching and more

(7)
Top Tutor
locationImg Boduppal, Hyderabad
experience 17 yrs of Exp students 2 students
greenClock 39 hrs of classes completed
rsIcon 300 per hour
Intermediate Physics lecturer 17years experience
Online Classes Online Classes

Excellent

Neeharika

The teaching method was very clear was easily able to understand the topic and doubts were cleared patiently.

Skills: Physics
Also teaches: Class 12 Tuition

(110)
superTutorSuper Tutor
locationImg Sector 83, Gurgaon
experience 20 yrs of Exp students 34 students
greenClock 5038 hrs of classes completed
rsIcon 800 per hour
Associate Professor-Mathematics with 25 years of Experience in
Online Classes Online Classes
regularClasses Tutor's home

With 26 years of extensive experience in teaching mathematics, I specialize in instructing students from grades 9 through 12 across various boards, including CBSE, ICSE, and State Boards. My academic qualifications include a BSc, BTech in Mathematics, MSc, BEd, and I am currently pursuing a PhD. This strong educational background, coupled with my long-standing commitment to teaching, has allowed me to develop a comprehensive approach to mathematics education. I have held prestigious positions as a College Associate Professor at esteemed institutions such as Ganga Institute of Technology and Management, VAISH College, and BLS University. My dedication to teaching has been recognized with the Best Teacher Award from both VAISH College and Ganga Institute of Technology and Management. These accolades reflect my commitment to delivering high-quality education and fostering academic excellence in my students. Currently, I run my own offline center where I conduct mathematics classes for students in grades 9 through 12. In addition to my offline classes, I also offer online sessions to provide flexible learning options. My teaching methods involve practical sessions using a whiteboard to facilitate a clear and engaging learning experience. I emphasize the importance of regular assessments, providing my students with notes, assignments, and weekly tests to track their progress and ensure thorough understanding. My approach to teaching mathematics is rooted in practical application and interactive learning. By focusing on real-world problems and fostering a supportive learning environment, I aim to help students build a strong foundation in mathematics, achieve academic success, and develop a lifelong appreciation for the subject.

Neelu Saxena

Very patient teacher who makes maths easy and manageable. Fear factor of this subject is completely removed by her . Very competent indeed .

Skills: Mathematics
Also teaches: BTech Tuition, Class 10 Tuition and more

Other Subjects in CBSE - Class 11

Worksheet Icon

Download free CBSE - Class 11 Biology Transport in Plants EXERCISES worksheets

Download Now

Find Best Class 11 Tuition ?

Find Now »