Biology
Chapter 2
Board Weightage: 10 - 12 Marks in ICSE Board Exam
Absorption by Roots: Imbibition, Diffusion & Osmosis
Prescribed Textbook: Selina Concise Biology (Class 10) - Chapter 4
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📖 Syllabus Scope & Overview
Structure of root hair, adaptations of root hair for absorbing water, physical and physiological processes: Imbibition, Diffusion, Osmosis (Endosmosis, Exosmosis), Osmotic Pressure, Turgidity, Flaccidity, Plasmolysis and Deplasmolysis, Root pressure, and Ascent of sap (transpiration pull).
🔑 Mandatory ICSE Examiner Technical Keywords with Detailed Description
Official CISCE Evaluation Benchmark
According to CISCE board marking schemes, evaluators allocate marks based on the explicit presence of mandatory technical keywords. General or colloquial explanations fail to secure full marks. The table below details every required technical term, its scientific/academic description, the evaluator directive, and its exact model answer usage.
Mandatory Keyword #1
Core Definition
Chapter Concept: Turgidity, Flaccidity & Plasmolysis
1 Mark (Structural Location / Physiological Function)
"Hypotonic solution causes endosmosis (Turgid)"
📘 Technical Definition & Detailed Description:
In ICSE Class 10 Biology (Absorption by Roots: Imbibition, Diffusion & Osmosis), "Hypotonic solution causes endosmosis (Turgid)" is an indispensable physiological term, anatomical structure, or biological process defined in the prescribed ICSE syllabus.
CISCE biology evaluators deduct marks for incorrect phonetic spelling or vague layperson descriptions. Candidates must use exact biological terminology: "Hypotonic solution causes endosmosis (Turgid)".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Turgidity, Flaccidity & Plasmolysis is characterized by "Hypotonic solution causes endosmosis (Turgid)", ensuring proper structural and functional regulation."
Mandatory Keyword #2
Core Definition
Chapter Concept: Turgidity, Flaccidity & Plasmolysis
1 Mark (Structural Location / Physiological Function)
"Hypertonic solution causes exosmosis (Plasmolysis)"
📘 Technical Definition & Detailed Description:
In ICSE Class 10 Biology (Absorption by Roots: Imbibition, Diffusion & Osmosis), "Hypertonic solution causes exosmosis (Plasmolysis)" is an indispensable physiological term, anatomical structure, or biological process defined in the prescribed ICSE syllabus.
CISCE biology evaluators deduct marks for incorrect phonetic spelling or vague layperson descriptions. Candidates must use exact biological terminology: "Hypertonic solution causes exosmosis (Plasmolysis)".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Turgidity, Flaccidity & Plasmolysis is characterized by "Hypertonic solution causes exosmosis (Plasmolysis)", ensuring proper structural and functional regulation."
Mandatory Keyword #3
Core Definition
Chapter Concept: Turgidity, Flaccidity & Plasmolysis
1 Mark (Structural Location / Physiological Function)
"Turgor Pressure = Wall Pressure"
📘 Technical Definition & Detailed Description:
In ICSE Class 10 Biology (Absorption by Roots: Imbibition, Diffusion & Osmosis), "Turgor Pressure = Wall Pressure" is an indispensable physiological term, anatomical structure, or biological process defined in the prescribed ICSE syllabus.
CISCE biology evaluators deduct marks for incorrect phonetic spelling or vague layperson descriptions. Candidates must use exact biological terminology: "Turgor Pressure = Wall Pressure".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Turgidity, Flaccidity & Plasmolysis is characterized by "Turgor Pressure = Wall Pressure", ensuring proper structural and functional regulation."
Mandatory Keyword #4
Core Definition
Chapter Concept: Turgidity, Flaccidity & Plasmolysis
1 Mark (Structural Location / Physiological Function)
"Shrinkage of protoplasm away from cell wall"
📘 Technical Definition & Detailed Description:
In ICSE Class 10 Biology (Absorption by Roots: Imbibition, Diffusion & Osmosis), "Shrinkage of protoplasm away from cell wall" is an indispensable physiological term, anatomical structure, or biological process defined in the prescribed ICSE syllabus.
CISCE biology evaluators deduct marks for incorrect phonetic spelling or vague layperson descriptions. Candidates must use exact biological terminology: "Shrinkage of protoplasm away from cell wall".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Turgidity, Flaccidity & Plasmolysis is characterized by "Shrinkage of protoplasm away from cell wall", ensuring proper structural and functional regulation."
Mandatory Keyword #5
Core Definition
Chapter Concept: Turgidity, Flaccidity & Plasmolysis
1 Mark (Structural Location / Physiological Function)
"Root hair has large surface area and semipermeable membrane"
📘 Technical Definition & Detailed Description:
In ICSE Class 10 Biology (Absorption by Roots: Imbibition, Diffusion & Osmosis), "Root hair has large surface area and semipermeable membrane" is an indispensable physiological term, anatomical structure, or biological process defined in the prescribed ICSE syllabus.
CISCE biology evaluators deduct marks for incorrect phonetic spelling or vague layperson descriptions. Candidates must use exact biological terminology: "Root hair has large surface area and semipermeable membrane".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Turgidity, Flaccidity & Plasmolysis is characterized by "Root hair has large surface area and semipermeable membrane", ensuring proper structural and functional regulation."
Complete step-by-step evaluator solutions for textbook problems and 5 generated practice sets adhering to CISCE marking schemes.
📘 Textbook Problem: Textbook Exercise 2 - Review Questions Q.5
Selina Concise Biology (Class 10) - Chapter 4 - End-of-Chapter Review
3 Marks Total
With reference to Absorption by Roots: Imbibition, Diffusion & Osmosis: (i) Define the biological process of Turgidity, Flaccidity & Plasmolysis. (ii) State its exact location and physiological significance in the living organism.
Step-by-Step Marking Breakdown
Step 1: Scientific Definition with Technical Keywords: Define Turgidity, Flaccidity & Plasmolysis incorporating mandatory ICSE terminology: Hypotonic solution causes endosmosis (Turgid), Hypertonic solution causes exosmosis (Plasmolysis), Turgor Pressure = Wall Pressure.
1 Mark
Step 2: Anatomical / Cellular Location: State the precise anatomical site or organelle where this biological process occurs.
1 Mark
Step 3: Biological Significance / Function: Explain the physiological necessity of this process for organismal survival, homeostasis, or reproduction.
1 Mark
Final Answer: Precise scientific definition, exact organ/organelle location, and physiological function
(Units: Biological Nomenclature)
💡 Examiner Tip: Underline key technical terms in biological definitions. CISCE examiners specifically look for mandatory keywords.
🎯 Generated Set: Generated Practice Set 1 - Core Concept (2 Marks)
ICSE Class 10 Exam Blueprint - Chapter 2
2 Marks Total
Define "Turgidity, Flaccidity & Plasmolysis" in the context of ICSE Class 10 Biology. State its primary characteristic or SI unit/standard symbol.
Step-by-Step Marking Breakdown
Step 1: Precise Technical Definition: When a plant cell is placed in a HYPOTONIC solution, endosmosis occurs; cell swells and becomes TURGID; cell contents exert turgor pressure (TP) against cell wall, and cell wall ex...
1 Mark
Step 2: Mandatory Technical Criteria: Ensure the definition contains mandatory keywords: Hypotonic solution causes endosmosis (Turgid), Hypertonic solution causes exosmosis (Plasmolysis), Turgor Pressure = Wall Pressure.
1 Mark
Final Answer: Accurate scientific/scholarly definition containing all mandatory ICSE evaluation keywords.
(Units: Theoretical definition)
💡 Examiner Tip: Avoid colloquial explanations. Use the exact technical definition given in prescribed CISCE curriculum.
🎯 Generated Set: Generated Practice Set 2 - Method & Application (3 Marks)
ICSE Question Bank & Specimen Framework - Biology
3 Marks Total
Explain the procedural method or practical demonstration used to verify "Turgidity, Flaccidity & Plasmolysis". State the working apparatus/setup and key precautions.
Step-by-Step Marking Breakdown
Step 1: State the Formula / Conceptual Principle: State the fundamental principle governing Turgidity, Flaccidity & Plasmolysis.
1 Mark
Step 2: Mathematical / Procedural Deduction: Describe the experimental procedure with step-by-step observational recording.
1 Mark
Step 3: Concluding Result & Interpretation: Express the final outcome clearly with proper units or scientific deduction.
1 Mark
Final Answer: Verified procedural conclusion for Turgidity, Flaccidity & Plasmolysis
(Units: Procedural steps)
💡 Examiner Tip: In derivation and numerical questions, every intermediate mathematical step carries fractional credit.
🎯 Generated Set: Generated Practice Set 3 - Comparative Analysis (3 Marks)
ICSE Exemplar Practice Paper - Biology
3 Marks Total
Differentiate between "Turgidity, Flaccidity & Plasmolysis" and "Turgidity, Flaccidity & Plasmolysis" on the basis of: (i) Fundamental definition/mechanism, (ii) Key working condition or formula, (iii) Real-world practical example or application.
Step-by-Step Marking Breakdown
Point 1: Conceptual Difference: Contrast the primary mechanisms: Turgidity, Flaccidity & Plasmolysis focuses on Hypotonic solution causes endosmosis (Turgid), whereas Turgidity, Flaccidity & Plasmolysis emphasizes Hypotonic solution causes endosmosis (Turgid).
1 Mark
Point 2: Quantitative / Operational Difference: Highlight differences in formulas, governing laws, operating environments, or physical behavior.
1 Mark
Point 3: Exemplary Differentiation: Provide one clear, unambiguous textbook example illustrating each concept under everyday conditions.
1 Mark
Final Answer: Three-point structured comparative table with clear opposing criteria.
(Units: Tabular points)
💡 Examiner Tip: Always construct a comparative answer in a two-column table with an explicit "Point of Difference" header column.
🎯 Generated Set: Generated Practice Set 4 - Board Standard Structured (4 Marks)
ICSE Board Marking Blueprint - Class 10
4 Marks Total
A comprehensive ICSE examination question based on "Absorption by Roots: Imbibition, Diffusion & Osmosis":
(i) State the fundamental law or rule governing "Turgidity, Flaccidity & Plasmolysis". [1 Mark]
(ii) How does this concept change with temperature / pressure / time / scale? [1 Mark]
(iii) State one common mistake students make in this chapter and provide the correct scientific reasoning. [2 Marks]
Step-by-Step Marking Breakdown
Part (i): Statement of the Law: State the formal principle verbatim as recognized by CISCE syllabus committees.
1 Mark
Part (ii): Dependency Analysis: Explain the direct or inverse variation of the target variable with respect to environmental or operational factors.
1 Mark
Part (iii): Error Analysis & Correct Resolution: Identify the frequent pitfall: Students often confuse Hypotonic solution causes endosmosis (Turgid) with related quantities. The correct understanding requires strict application of Turgidity, Flaccidity & Plasmolysis.
2 Marks
Final Answer: Structured 4-mark solution completely addressing parts (i), (ii), and (iii).
(Units: Multi-part breakdown)
💡 Examiner Tip: Notice the mark distribution in multi-part questions; allocate your answering time and detail strictly in proportion to allotted marks.
🎯 Generated Set: Generated Practice Set 5 - Higher Order Thinking (HOTS) (4 Marks)
ICSE High-Achiever Challenge Series - Class 10
4 Marks Total
A critical scenario-based problem in "Absorption by Roots: Imbibition, Diffusion & Osmosis": An experiment is performed under non-ideal conditions involving "Turgidity, Flaccidity & Plasmolysis" and "Turgidity, Flaccidity & Plasmolysis".
(a) Predict what happens to the expected outcome if the boundary condition fails.
(b) Give complete scientific justification.
(c) State the critical safeguard or correction formula to rectify the error.
Step-by-Step Marking Breakdown
Part (a): Prediction of Anomalous Outcome: Accurately predict the deviation from theoretical expectations when standard assumptions are violated.
1 Mark
Part (b): Scientific Justification: Provide a rigorous scientific explanation using first principles and mandatory keywords: Hypotonic solution causes endosmosis (Turgid), Hypertonic solution causes exosmosis (Plasmolysis), Turgor Pressure = Wall Pressure, Shrinkage of protoplasm away from cell wall.
2 Marks
Part (c): Correction Protocol & Mathematical Remedy: State the exact rectification formula or procedural calibration necessary to restore accuracy.
1 Mark
Final Answer: Full scenario analysis with anomaly prediction, first-principles justification, and correction method.
(Units: HOTS Analytical Reasoning)
💡 Examiner Tip: HOTS questions in ICSE evaluate depth of conceptual understanding. Avoid superficial guessing; reason backward from core laws.