Neco 2020 Biology Question 2

Practice objective / multiple choice question 2 from the 2020 Neco Biology examination.

Neco 2020 Biology Objective / Multiple Choice Hard Difficulty
Question 2 NECO • 2020 • BIOLOGY • objective

A researcher sampled a 2‑ha pond using five 1 m\(^2\) quadrats. The counts of algae (A), zooplankton (Z) and small fish (F) in each quadrat were: (2000,150,30), (1800,120,25), (2100,160,35), (1900,130,28), (2050,140,32). The average individual masses are: algae 0.001 mg, zooplankton 0.05 mg and fish 5 g.\n(a) Estimate the total biomass of each group in the pond and state the percentage of the total biomass contributed by fish.\n(b) Assuming a 10 % energy transfer efficiency between successive trophic levels, what is the overall energy transfer efficiency from algae (primary producers) to the fish (secondary consumers)?

Answer Options

Correct Answer A. Fish contribute about 99.99\% of total biomass; overall energy transfer efficiency ≈1\%.
B. Fish contribute about 85\% of total biomass; overall energy transfer efficiency ≈0.5\%.
C. Fish contribute about 95\% of total biomass; overall energy transfer efficiency ≈2\%.
D. Fish contribute about 70\% of total biomass; overall energy transfer efficiency ≈3\%.
Correct Answer
A
Correct Option:
Fish contribute about 99.99\% of total biomass; overall energy transfer efficiency ≈1\%.

About This Question

This is Neco 2020 Biology Question 2. It is one of the objective questions from the 2020 Neco Biology examination.

Difficulty level: Hard .

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