Biology
Chapter 8
Board Weightage: 10 Marks in Class 8 Exams
Diseases & First Aid
Prescribed Textbook: Selina Concise Biology (Class 8) - Chapter 8
Canonical Link:
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📖 Syllabus Scope & Overview
Communicable vs non-communicable diseases, causative pathogens (bacteria, viruses, protozoa, fungi, worms), vectors (female Anopheles mosquito transmits malaria parasite Plasmodium, Aedes mosquito transmits dengue), immunization, and first aid for burns, fractures, and bleeding.
🔑 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: Disease Transmission & Vectors
1 Mark (Structural Location / Physiological Function)
"Female Anopheles transmits Plasmodium"
📘 Technical Definition & Detailed Description:
In ICSE Class 8 Biology (Diseases & First Aid), "Female Anopheles transmits Plasmodium" 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: "Female Anopheles transmits Plasmodium".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Disease Transmission & Vectors is characterized by "Female Anopheles transmits Plasmodium", ensuring proper structural and functional regulation."
Mandatory Keyword #2
Core Definition
Chapter Concept: Disease Transmission & Vectors
1 Mark (Structural Location / Physiological Function)
"Aedes transmits dengue virus"
📘 Technical Definition & Detailed Description:
In ICSE Class 8 Biology (Diseases & First Aid), "Aedes transmits dengue virus" 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: "Aedes transmits dengue virus".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Disease Transmission & Vectors is characterized by "Aedes transmits dengue virus", ensuring proper structural and functional regulation."
Mandatory Keyword #3
Core Definition
Chapter Concept: Disease Transmission & Vectors
1 Mark (Structural Location / Physiological Function)
"Bacterial typhoid Salmonella"
📘 Technical Definition & Detailed Description:
In ICSE Class 8 Biology (Diseases & First Aid), "Bacterial typhoid Salmonella" 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: "Bacterial typhoid Salmonella".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Disease Transmission & Vectors is characterized by "Bacterial typhoid Salmonella", ensuring proper structural and functional regulation."
Mandatory Keyword #4
Core Definition
Chapter Concept: Disease Transmission & Vectors
1 Mark (Structural Location / Physiological Function)
"First aid splint and direct pressure"
📘 Technical Definition & Detailed Description:
In ICSE Class 8 Biology (Diseases & First Aid), "First aid splint and direct 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: "First aid splint and direct pressure".
📝 Model Answer Application (Exact Phrasing for Board Exam):
"The physiological role of Disease Transmission & Vectors is characterized by "First aid splint and direct pressure", 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 8 - Review Questions Q.5
Selina Concise Biology (Class 8) - Chapter 8 - End-of-Chapter Review
3 Marks Total
With reference to Diseases & First Aid: (i) Define the biological process of Disease Transmission & Vectors. (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 Disease Transmission & Vectors incorporating mandatory ICSE terminology: Female Anopheles transmits Plasmodium, Aedes transmits dengue virus, Bacterial typhoid Salmonella.
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 8 Exam Blueprint - Chapter 8
2 Marks Total
Define "Disease Transmission & Vectors" in the context of ICSE Class 8 Biology. State its primary characteristic or SI unit/standard symbol.
Step-by-Step Marking Breakdown
Step 1: Precise Technical Definition: Malaria: caused by protozoan Plasmodium, transmitted by female Anopheles mosquito. Dengue: caused by virus, transmitted by day-biting Aedes mosquito. Typhoid: caused by bacterium S...
1 Mark
Step 2: Mandatory Technical Criteria: Ensure the definition contains mandatory keywords: Female Anopheles transmits Plasmodium, Aedes transmits dengue virus, Bacterial typhoid Salmonella.
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 "Disease Transmission & Vectors". 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 Disease Transmission & Vectors.
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 Disease Transmission & Vectors
(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 "Disease Transmission & Vectors" and "Disease Transmission & Vectors" 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: Disease Transmission & Vectors focuses on Female Anopheles transmits Plasmodium, whereas Disease Transmission & Vectors emphasizes Female Anopheles transmits Plasmodium.
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 8
4 Marks Total
A comprehensive ICSE examination question based on "Diseases & First Aid":
(i) State the fundamental law or rule governing "Disease Transmission & Vectors". [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 Female Anopheles transmits Plasmodium with related quantities. The correct understanding requires strict application of Disease Transmission & Vectors.
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 8
4 Marks Total
A critical scenario-based problem in "Diseases & First Aid": An experiment is performed under non-ideal conditions involving "Disease Transmission & Vectors" and "Disease Transmission & Vectors".
(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: Female Anopheles transmits Plasmodium, Aedes transmits dengue virus, Bacterial typhoid Salmonella, First aid splint and direct pressure.
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.