Neco 2025 Biology Question 40

Practice objective / multiple choice question 40 from the 2025 Neco Biology examination.

Neco 2025 Biology Objective / Multiple Choice Hard Difficulty
Question 40 NECO • 2025 • BIOLOGY • objective

A researcher grew seedlings under three different monochromatic lights for 10 days. The mean heights and standard deviations (n = 5 for each treatment) were: red light - 12.3 cm (SD 1.2), blue light - 14.8 cm (SD 1.5), green light - 10.1 cm (SD 1.0). Assuming normal distribution and equal variances, (a) perform a one‑way ANOVA at \(\alpha = 0.05\) to test whether light colour affects seedling height. (b) If the ANOVA is significant, identify the pair of treatments with the greatest mean difference and state the result of a two‑sample t‑test for that pair (use pooled variance).

Answer Options

Correct Answer A. ANOVA: F≈17.7 > 3.89 → significant; greatest difference blue vs green, t≈5.9 (significant)
B. ANOVA: F≈17.7 > 3.89 → significant; greatest difference red vs green, t≈3.1 (significant)
C. ANOVA: F≈12.4 > 3.89 → significant; greatest difference red vs blue, t≈4.2 (significant)
D. ANOVA: F≈9.1 < 3.89 → not significant; no pair difference, t≈0 (n.s.)
Correct Answer
A
Correct Option:
ANOVA: F≈17.7 > 3.89 → significant; greatest difference blue vs green, t≈5.9 (significant)

About This Question

This is Neco 2025 Biology Question 40. It is one of the objective questions from the 2025 Neco Biology examination.

Difficulty level: Hard .

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