Neco 2023 Biology Question 8

Practice objective / multiple choice question 8 from the 2023 Neco Biology examination.

Neco 2023 Biology Objective / Multiple Choice Hard Difficulty
Question 8 NECO • 2023 • BIOLOGY • objective

A researcher samples macroinvertebrates in a pond using five 1‑m² quadrats and records the following abundances: chironomid larvae = 30, mosquito larvae = 20, water beetles = 10, dragonfly nymphs = 5, snails = 5. (a) Compute the Shannon-Wiener diversity index \(H'\) (use natural logarithms). (b) Given average biomass per individual: chironomid = 0.02 g, mosquito = 0.03 g, beetle = 0.5 g, dragonfly = 0.8 g, snail = 0.4 g, identify which trophic level contributes the greatest proportion of the total biomass.

Answer Options

Correct Answer A. H' ≈ 1.38; the secondary‑consumer level (water beetles) contributes the greatest biomass.
B. H' ≈ 1.20; the primary‑consumer level (mosquito larvae) contributes the greatest biomass.
C. H' ≈ 1.55; the tertiary‑consumer level (dragonfly nymphs) contributes the greatest biomass.
D. H' ≈ 1.38; the primary‑producer level (snails) contributes the greatest biomass.
Correct Answer
A
Correct Option:
H' ≈ 1.38; the secondary‑consumer level (water beetles) contributes the greatest biomass.

About This Question

This is Neco 2023 Biology Question 8. It is one of the objective questions from the 2023 Neco Biology examination.

Difficulty level: Hard .

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