Neco 2025 Biology Question 32

Practice objective / multiple choice question 32 from the 2025 Neco Biology examination.

Neco 2025 Biology Objective / Multiple Choice Medium Difficulty
Question 32 NECO • 2025 • BIOLOGY • objective

A lineage of beetles contained 50 species 10 million years ago. Today it comprises 200 species. Assuming exponential diversification described by \(N(t)=N_{0}e^{rt}\), where \(r=\lambda-\mu\) is the net diversification rate, determine (i) the value of \(r\) (in Myr\(^{-1}\)), and (ii) if the speciation rate is known to be \(\lambda =0.20\) Myr\(^{-1}\), calculate the extinction rate \(\mu\). Express \(r\) to three decimal places and \(\mu\) to three decimal places.

Answer Options

A. r = 0.139 Myr^{-1}, \mu = 0.080 Myr^{-1}
B. r = 0.120 Myr^{-1}, \mu = 0.080 Myr^{-1}
C. r = 0.150 Myr^{-1}, \mu = 0.050 Myr^{-1}
Correct Answer D. r = 0.139 Myr^{-1}, \mu = 0.061 Myr^{-1}
Correct Answer
D
Correct Option:
r = 0.139 Myr^{-1}, \mu = 0.061 Myr^{-1}

About This Question

This is Neco 2025 Biology Question 32. It is one of the objective questions from the 2025 Neco Biology examination.

Difficulty level: Medium .

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