Biology
Chapter 6
Board Weightage: 12 - 14 Marks in ICSE Board Exam
The Circulatory System: Heart & Blood Vessels
Prescribed Textbook: Selina Concise Biology (Class 10) - Chapter 8
Canonical Link:
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📖 Syllabus Scope & Overview
Composition of blood (Plasma 55%, RBCs/Erythrocytes with haemoglobin, WBCs/Leukocytes: granulocytes & agranulocytes, Platelets/Thrombocytes), blood clotting mechanism (Thrombokinase → Prothrombin to Thrombin → Fibrinogen to Fibrin network), ABO blood groups and Rh factor (Erythroblastosis foetalis), external and internal structure of human heart, valves (Tricuspid, Bicuspid/Mitral, Semilunar), cardiac cycle, double circulation (Pulmonary and Systemic), and differences between Artery, Vein, and Capillary.
🔑 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: Double Circulation & Heart Valves
1 Mark (Structural Location / Physiological Function)
"Pulmonary and Systemic circulation"
📘 Technical Definition & Detailed Description:
In ICSE Class 10 Biology (The Circulatory System: Heart & Blood Vessels), "Pulmonary and Systemic circulation" 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: "Pulmonary and Systemic circulation".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Double Circulation & Heart Valves is characterized by "Pulmonary and Systemic circulation", ensuring proper structural and functional regulation."
Mandatory Keyword #2
Core Definition
Chapter Concept: Double Circulation & Heart Valves
1 Mark (Structural Location / Physiological Function)
"Tricuspid on right, Bicuspid/Mitral on left"
📘 Technical Definition & Detailed Description:
In ICSE Class 10 Biology (The Circulatory System: Heart & Blood Vessels), "Tricuspid on right, Bicuspid/Mitral on left" 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: "Tricuspid on right, Bicuspid/Mitral on left".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Double Circulation & Heart Valves is characterized by "Tricuspid on right, Bicuspid/Mitral on left", ensuring proper structural and functional regulation."
Mandatory Keyword #3
Core Definition
Chapter Concept: Double Circulation & Heart Valves
1 Mark (Structural Location / Physiological Function)
"Thick muscular wall of left ventricle (pumps to whole body)"
📘 Technical Definition & Detailed Description:
In ICSE Class 10 Biology (The Circulatory System: Heart & Blood Vessels), "Thick muscular wall of left ventricle (pumps to whole body)" 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: "Thick muscular wall of left ventricle (pumps to whole body)".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Double Circulation & Heart Valves is characterized by "Thick muscular wall of left ventricle (pumps to whole body)", ensuring proper structural and functional regulation."
Mandatory Keyword #4
Core Definition
Chapter Concept: Double Circulation & Heart Valves
1 Mark (Structural Location / Physiological Function)
"Artery has thick elastic wall and narrow lumen; Vein has thin wall, wide lumen and valves"
📘 Technical Definition & Detailed Description:
In ICSE Class 10 Biology (The Circulatory System: Heart & Blood Vessels), "Artery has thick elastic wall and narrow lumen; Vein has thin wall, wide lumen and valves" 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: "Artery has thick elastic wall and narrow lumen; Vein has thin wall, wide lumen and valves".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Double Circulation & Heart Valves is characterized by "Artery has thick elastic wall and narrow lumen; Vein has thin wall, wide lumen and valves", 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 6 - Review Questions Q.5
Selina Concise Biology (Class 10) - Chapter 8 - End-of-Chapter Review
3 Marks Total
With reference to The Circulatory System: Heart & Blood Vessels: (i) Define the biological process of Double Circulation & Heart Valves. (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 Double Circulation & Heart Valves incorporating mandatory ICSE terminology: Pulmonary and Systemic circulation, Tricuspid on right, Bicuspid/Mitral on left, Thick muscular wall of left ventricle (pumps to whole body).
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 6
2 Marks Total
Define "Double Circulation & Heart Valves" 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: Double circulation: Blood flows twice through heart in one complete cycle: 1. Pulmonary circulation (Right ventricle → Pulmonary artery → Lungs → Pulmonary veins → Left atrium). 2....
1 Mark
Step 2: Mandatory Technical Criteria: Ensure the definition contains mandatory keywords: Pulmonary and Systemic circulation, Tricuspid on right, Bicuspid/Mitral on left, Thick muscular wall of left ventricle (pumps to whole body).
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 "Double Circulation & Heart Valves". 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 Double Circulation & Heart Valves.
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 Double Circulation & Heart Valves
(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 "Double Circulation & Heart Valves" and "Double Circulation & Heart Valves" 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: Double Circulation & Heart Valves focuses on Pulmonary and Systemic circulation, whereas Double Circulation & Heart Valves emphasizes Pulmonary and Systemic circulation.
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 "The Circulatory System: Heart & Blood Vessels":
(i) State the fundamental law or rule governing "Double Circulation & Heart Valves". [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 Pulmonary and Systemic circulation with related quantities. The correct understanding requires strict application of Double Circulation & Heart Valves.
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 "The Circulatory System: Heart & Blood Vessels": An experiment is performed under non-ideal conditions involving "Double Circulation & Heart Valves" and "Double Circulation & Heart Valves".
(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: Pulmonary and Systemic circulation, Tricuspid on right, Bicuspid/Mitral on left, Thick muscular wall of left ventricle (pumps to whole body), Artery has thick elastic wall and narrow lumen; Vein has thin wall, wide lumen and valves.
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.