Marking schemes

MARKING SCHEME — 5 marks

Step 1 — Identify coefficients                           [½ mark]
  a = 2, b = 7, c = 3

Step 2 — State the quadratic formula                     [½ mark]
  x = (−b ± √(b² − 4ac)) / 2a

Step 3 — Substitute correctly                            [1 mark]
  x = (−7 ± √(49 − 24)) / 4
  x = (−7 ± √25) / 4
  x = (−7 ± 5) / 4

Step 4 — Calculate both roots                            [1 mark]
  x₁ = (−7 + 5) / 4 = −2/4 = −½
  x₂ = (−7 − 5) / 4 = −12/4 = −3

Step 5 — Verify by substitution (either root shown)      [1 mark]
  For x = −½: 2(¼) + 7(−½) + 3 = ½ − 3½ + 3 = 0 ✓

Step 6 — Final statement                                 [1 mark]
  Therefore x = −½ or x = −3

PARTIAL CREDIT RULES
• Award Step 3 marks even if Steps 1–2 are missing, if formula is applied correctly.
• Arithmetic error in Step 3: carry-forward — award Steps 4–5 if method is correct.
• Verification missing: maximum 4/5.

COMMON ERRORS TO FLAG (do not award mark)
✗ Forgetting ± (writing only +)
✗ Error in discriminant: b² − 4ac computed as b² + 4ac

MARKING SCHEME — 3 marks (1 mark per value-point)

Value Point 1 — Definition / process                     [1 mark]
  Photosynthesis is the process by which green plants use sunlight, water and
  carbon dioxide to produce glucose and oxygen.
  [Accept any equivalent scientifically accurate statement.]

Value Point 2 — Raw materials (BOTH required)            [1 mark]
  Raw materials: carbon dioxide (CO₂) + water (H₂O)
  [Must name both. One alone scores 0 on this point.]
  Bonus: sunlight and chlorophyll named as energy source/catalyst → no extra mark.

Value Point 3 — Products and equation                    [1 mark]
  Products: glucose (C₆H₁₂O₆) + oxygen (O₂)
  Balanced equation accepted:
    6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂

PARTIAL CREDIT RULES
• Full equation with correct balancing = all 3 marks if it implies the process.
• "Sugar" accepted in place of glucose; "food" not accepted.

COMMON ERRORS TO FLAG
✗ Writing CO instead of CO₂
✗ Stating only 1 raw material
✗ Confusing photosynthesis with respiration (reverse equation)

MARKING SCHEME — 10 marks

ANALYTICAL BREAKDOWN

A. Format & Presentation                                 [2 marks]
  2: Heading, byline, clear paragraph breaks, within word limit.
  1: Heading present OR paragraphs used, but not both; minor overrun (±20 words).
  0: No heading, no paragraphs, severely off word count.

B. Content & Ideas                                       [4 marks]
  4: Balanced view with at least 2 impacts each side OR strong single-stance
     with 3+ supporting points; specific examples / statistics used.
  3: Some balance; 2–3 relevant points; one concrete example.
  2: Only one dimension (purely positive or purely negative); vague points.
  1: Barely relevant content; topic not adequately addressed.
  0: Off topic.

C. Language & Vocabulary                                 [2 marks]
  2: Varied sentence structure; topic-specific vocabulary; ≤ 2 errors.
  1: Simple but correct sentences; 3–5 errors that don't impede meaning.
  0: Frequent errors; meaning obscured.

D. Cohesion & Flow                                       [2 marks]
  2: Logical progression; connectives used (however, therefore, in contrast).
  1: Some linking but ideas feel disconnected at points.
  0: No logical order.

TOTAL: A + B + C + D = /10

COMMON ERRORS TO FLAG
✗ Writing as an essay, not an article (no heading/byline)
✗ Opinion piece without any factual content
✗ First person throughout (acceptable only if clearly a personal column)

MARKING SCHEME — 4 marks (2 + 2)

Part (i) — Gandhi's main argument                        [2 marks]
  Award 1 mark each for any two of:
  • British rule was sustained by Indian cooperation; withdraw that and it collapses.
  • Non-violence (ahimsa) and non-cooperation were moral duties, not just tactics.
  • Indians must boycott British goods, courts and educational institutions.
  • Swaraj could be achieved within one year through disciplined non-cooperation.

Part (ii) — Calling off the movement                     [2 marks]
  Award 1 mark each for any two of:
  • Chauri Chaura incident (Feb 1922) — a violent mob burnt a police station, killing 22 policemen.
  • Gandhi believed the movement had become violent, contradicting the principle of ahimsa.
  • He suspended the movement unilaterally despite opposition from other Congress leaders.
  [Only 1 mark if student gives incident without explaining the connection to Gandhi's principles.]

PARTIAL CREDIT RULES
• Answers in own words accepted — exact textbook phrasing not required.
• Date not required but does not lose mark if incorrectly stated (unless it changes the answer).

COMMON ERRORS TO FLAG
✗ Confusing Jallianwala Bagh with Chauri Chaura
✗ Saying Gandhi "lost" rather than "suspended" the movement

MARKING SCHEME — 5 marks

Criterion 1 — Setup and safety                          [1 mark]
  1: Burette clamped vertically, washed with NaOH solution, no air bubble in tip.
     Safety: lab coat / gloves noted or observed.
  0: Burette not rinsed with solution OR air bubble present.

Criterion 2 — Procedure (observations)                  [1 mark]
  1: Correct indicator (phenolphthalein) used; initial and final burette readings recorded
     to 2 decimal places; colour change at endpoint described (pink → colourless).
  0: Wrong indicator OR readings not recorded.

Criterion 3 — Concordant titres achieved                [1 mark]
  1: At least 2 titre values within ± 0.10 ml of each other (concordant).
  0: Only 1 reading or readings not concordant.

Criterion 4 — Calculation                               [1 mark]
  1: Correct formula applied: C₁V₁ = C₂V₂; answer expressed in mol/L with 3 sig figs.
  0: Wrong formula or no units.

Criterion 5 — Record-keeping and result                 [1 mark]
  1: Neat tabulated readings; mean titre calculated; final answer stated clearly.
  0: No table OR no mean titre.

COMMON ERRORS TO FLAG
✗ Reading burette from top (misreading meniscus)
✗ Not rinsing conical flask between runs with distilled water only
✗ Exceeding endpoint (overshoot — bright pink)

MARKING SCHEME — 20 marks

CRITERION A — Research & Content                        [6 marks]
  5–6: All key aspects covered in depth; multiple credible sources cited; own analysis present.
  3–4: Main aspects covered; at least 2 sources; some analysis beyond summarising.
  1–2: Incomplete coverage; single source or Wikipedia only; no analysis.
  0: Off topic or copied wholesale.

CRITERION B — Organisation & Structure                  [4 marks]
  4: Clear introduction, body sections with headings, conclusion; logical flow throughout.
  2–3: Most sections present; minor flow issues.
  0–1: No clear structure; random ordering.

CRITERION C — Language & Presentation Quality           [4 marks]
  4: Correct grammar throughout; appropriate academic vocabulary; visual aids (charts,
     images) labelled and relevant.
  2–3: Mostly correct; visuals used but not all labelled.
  0–1: Frequent errors; no visuals.

CRITERION D — Oral Presentation                         [4 marks]
  4: Clear delivery; maintained audience eye contact; answered questions confidently.
  2–3: Mostly clear; read partially from notes; answered most questions.
  0–1: Read entirely from notes; unable to answer questions.

CRITERION E — Originality & Effort                      [2 marks]
  2: Evidence of independent thinking; went beyond prescribed sources; creative format.
  1: Standard effort meeting requirements.
  0: Clearly minimal effort.

GRADE CONVERSION
18–20: Outstanding  |  14–17: Good  |  10–13: Satisfactory  |  <10: Needs improvement