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Structured Examination Questions (Sections A, B & C)

SECTION A (16 Marks)
Answer ALL questions in this section.

1. For each of the items (i) - (iv), choose the correct answer from among the given alternatives and write its letter in the box provided:
(i) Which organelle is responsible for cellular respiration and ATP synthesis?
   A. Ribosome    B. Mitochondrion    C. Golgi apparatus    D. Lysosome
(ii) Which blood vessel carries oxygenated blood from the lungs to the heart?
   A. Pulmonary artery    B. Vena cava    C. Pulmonary vein    D. Hepatic portal vein
(iii) In a neutral aqueous solution at 25°C, the pH value is equal to:
   A. 1.0    B. 7.0    C. 14.0    D. 0.0
(iv) Solve for x given 2x² - 8 = 0:
   A. ±2    B. ±4    C. 2 only    D. 8

SECTION B (54 Marks)
Answer ALL questions in this section.

2. (a) Differentiate between Osmosis and Diffusion using two biological examples. (04 Marks)
   (b) Explain three adaptations of plant leaves for maximum photosynthesis. (05 Marks)

3. A sample of 25.0 cm³ of NaOH required 20.0 cm³ of 0.1 M H₂SO₄ for complete neutralization:
   2NaOH(aq) + H₂SO₄(aq) → Na₂SO₄(aq) + 2H₂O(l)
   Calculate the molarity of the NaOH solution in mol/dm³. (09 Marks)

SECTION C (30 Marks)
Answer TWO (2) questions from this section.

4. Explain six (6) causes and preventive measures of water-borne diseases in Tanzanian communities. (15 Marks)
5. Describe the significance of mitosis in growth, tissue repair, and asexual reproduction. (15 Marks)

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THE UNITED REPUBLIC OF TANZANIA

Candidate's Examination Number: [ ][ ][ ][ ][ ]/[ ][ ][ ][ ]

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