Igcse Model Questions Vol1 2020 Biology Question 20

Practice objective / multiple choice question 20 from the 2020 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2020 Biology Objective / Multiple Choice Hard Difficulty
Question 20 IGCSE_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • objective

A bacterial culture starts with \(2 \times 10^{5}\) cells. After 2 h the count is \(1.6 \times 10^{6}\) cells. Assuming exponential growth, (a) calculate the generation time in minutes; (b) if a bacteriostatic drug reduces the growth‑rate constant by 30 %, what will be the cell number after 6 h from the start?

Answer Options

Correct Answer A. (a) 40 min; (b) ≈ 1.6 × 10⁷ cells
B. (a) 30 min; (b) ≈ 1.2 × 10⁷ cells
C. (a) 50 min; (b) ≈ 1.0 × 10⁷ cells
D. (a) 45 min; (b) ≈ 2.0 × 10⁷ cells
Correct Answer
A
Correct Option:
(a) 40 min; (b) ≈ 1.6 × 10⁷ cells

About This Question

This is Igcse Model Questions Vol1 2020 Biology Question 20. It is one of the objective questions from the 2020 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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