Master the art of Cambridge IGCSE Food and Nutrition (0648) with our expert-designed guide. Learn how to secure maximum marks by replacing vague dietary terms with high-density scientific recall, structuring flawless Section C essays, and understanding the precise chemistry behind baking and heat-transfer processes.
อ่าน 4 นาทีอัปเดตเมื่อ: 21 มิ.ย. 2569
ภาพรวมข้อสอบ
จำนวนฉบับ
2
คะแนนเต็ม
200
เวลาสอบ
4ชม. 30นาที
ประเภทคำถาม
3
ฉบับ
เวลา
คะแนน
จำนวนข้อ
น้ำหนักคะแนน
ประเภทคำถาม
Paper 1 (Theory)
2ชม.
100
—
—
—
Paper 2 (Practical Test)
2ชม. 30นาที
100
—
—
—
เกณฑ์เกรด
A*ABCDEFGU
ข้อกำหนดเครื่องคิดเลข
A silent scientific calculator may be used on papers where calculators are permitted (some papers are non-calculator). It must not be graphical or programmable and must hold no stored information.
AO1: AO1 Knowledge with understanding (40%)
AO2: AO2 Handling information and solving problems (40%)
AO3: AO3 Practical application, planning, and evaluation (20%)
วัตถุประสงค์: Tabulate \(y\) across a range of \(x\) to locate sign changes (roots) and approximate maxima/minima.
ใช้เมื่อใด: Solving or sketching a function when you want to find where its graph crosses or turns.
ขั้นตอน
Enter the function in TABLE mode, set the start, end and step, then read where the sign of \(y\) changes or where it peaks.
ข้อควรระวังในการสอบ: Allowed on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
Statistics mode (mean, SD & regression)
Scientific calculator (e.g. Casio fx-991 series)
วัตถุประสงค์: Read the mean \(\bar{x}\) and standard deviation directly, and the gradient/intercept (and \(r\)) of a linear regression for bivariate data.
ใช้เมื่อใด: Any data-handling, statistics, or required-practical analysis question.
ขั้นตอน
Enter the data in STAT mode (1-VAR or A+BX), then recall \(\bar{x}\), \(\sigma\) or the regression coefficients.
ข้อควรระวังในการสอบ: Allowed on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
Carry exact values with Ans & memory
Scientific calculator (e.g. Casio fx-991 series)
วัตถุประสงค์: Keep full-precision intermediate values to avoid rounding errors.
ใช้เมื่อใด: Multi-step calculations where premature rounding loses the final accuracy mark.
ขั้นตอน
Use Ans, STO/RCL or the M+ memory to reuse the unrounded result of each step; round only the final answer.
ข้อควรระวังในการสอบ: Allowed on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
Equation solver — to CHECK your working
Scientific calculator (e.g. Casio fx-991 series)
วัตถุประสงค์: Use the built-in EQN/SOLVE mode to verify roots of quadratics or simultaneous equations you have already solved by algebra.
ใช้เมื่อใด: As a check only, after solving by hand.
ขั้นตอน
Enter the coefficients in EQN mode (or use SOLVE) and confirm they match your worked solution.
ข้อควรระวังในการสอบ: Allowed on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
ข้อผิดพลาดที่พบบ่อย
1highคะแนนที่เกี่ยวข้อง: 3Composition and value of the main foods in the diet
Naming generic food groups (such as 'vegetables', 'fruit', or 'meat') instead of identifying precise, high-density food sources (such as 'broccoli', 'cabbage', 'citrus fruits', or 'liver') when nutrient sources are requested.
วิธีหลีกเลี่ยง: Always list exact food examples belonging to the commodity groups. Write 'broccoli' or 'spinach' instead of 'vegetables', and 'oranges' or 'kiwi fruit' instead of 'fruit'.
2highคะแนนที่เกี่ยวข้อง: 2Nutritional terms
Writing general disease terms (e.g., 'anemia' or 'diabetes') instead of the exact medical terms required by the syllabus.
วิธีหลีกเลี่ยง: Use the highly specific terms: 'iron-deficiency anemia' or 'pernicious anemia' and 'type 2 diabetes' to gain full marks.
3mediumคะแนนที่เกี่ยวข้อง: 4Cooking of food
Failing to link a kitchen/cooking guideline (such as 'not overcooking cabbage' or 'blanching vegetables') to its scientific backing (such as 'heat destroys Vitamin C' or 'denaturing food enzymes').
วิธีหลีกเลี่ยง: For every preparation step described, write down its chemical or biological rationale. For example, explain that blanching denatures enzymes, stopping decay.
4highคะแนนที่เกี่ยวข้อง: 2Food spoilage and hygiene
Failing to state the exact temperature ranges for domestic cold storage, often confusing refrigeration levels with domestic freezer parameters.
วิธีหลีกเลี่ยง: Memorize exact ranges: Refrigerators must be kept between 0°C and 8°C (ideally under 5°C), while domestic freezers must register -18°C or below.
5mediumคะแนนที่เกี่ยวข้อง: 2Basic proportions and methods of making
Incomplete sequencing of the melting method for cake batters, frequently omitting the cooling step of the melted margarine/fat, sugar, and syrup mixture.
วิธีหลีกเลี่ยง: Ensure you state that the melted fat/syrup mixture must be cooled before adding whisked eggs to prevent premature egg protein coagulation.
6highคะแนนที่เกี่ยวข้อง: 2Nutritional terms
Omitting the concept of 'essential amino acids' when defining Low Biological Value (LBV) proteins, describing them simply as 'poor quality'.
วิธีหลีกเลี่ยง: Define LBV proteins as proteins that lack one or more essential amino acids (or indispensable amino acids) which the human body cannot synthesize.
7mediumคะแนนที่เกี่ยวข้อง: 3Cooking of food
Attributing the thickening of a roux sauce to the coagulation of flour proteins rather than starch gelatinisation.
วิธีหลีกเลี่ยง: State that thickening is due to starch granules absorbing water, swelling at 60°C, and bursting to gelatinise at 80°C.
8mediumคะแนนที่เกี่ยวข้อง: 2Food spoilage and hygiene
Refrigerating baked cakes to keep them fresh, failing to understand that this accelerates drying out.
วิธีหลีกเลี่ยง: Explain that refrigeration hastens starch retrogradation (crystallisation of starch), drying out the cake crumb. Cakes should be stored at room temperature in an airtight container.
9mediumคะแนนที่เกี่ยวข้อง: 4Cooking of food
Failing to explain the exact heat-transfer mechanisms of radiation, describing it simply as 'heat from a grill'.
วิธีหลีกเลี่ยง: Explain that heat is transferred directly in straight lines by electromagnetic or infrared waves, with no medium required, and is absorbed by the food's surface.