Igcse Model Questions Vol1 2018 Biology Question 15

Practice objective / multiple choice question 15 from the 2018 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2018 Biology Objective / Multiple Choice Hard Difficulty
Question 15 IGCSE_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • objective

Fossil measurements of a jaw bone show an average length of \(45\ \text{mm}\) in the older species A and \(60\ \text{mm}\) in the younger species B. The stratigraphic record indicates a time interval of 5 million years between the two species. (a) Assuming a constant linear change, calculate the rate of change in mm per million years. (b) An intermediate fossil dated 2.5 million years after species A has a jaw length of \(52\ \text{mm}\). Based on the rate from part (a), what length would be expected at that time, and does the observed length support the linear model? Provide the expected length and a brief conclusion.

Answer Options

A. Rate = 4 mm/Myr; expected length = 55 mm; observed 52 mm suggests deviation from linear model
B. Rate = 3 mm/Myr; expected length = 51 mm; observed 52 mm indicates slight inconsistency with linearity
C. Rate = 2 mm/Myr; expected length = 50 mm; observed 52 mm does not support linearity
Correct Answer D. Rate = 3 mm/Myr; expected length = 52.5 mm; observed 52 mm supports approximate linearity
Correct Answer
D
Correct Option:
Rate = 3 mm/Myr; expected length = 52.5 mm; observed 52 mm supports approximate linearity

About This Question

This is Igcse Model Questions Vol1 2018 Biology Question 15. It is one of the objective questions from the 2018 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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