Neco 2018 Biology Question 40

Practice objective / multiple choice question 40 from the 2018 Neco Biology examination.

Neco 2018 Biology Objective / Multiple Choice Medium Difficulty

Question 40 NECO • 2018 • BIOLOGY • objective

The spongy mesophyll layer of a leaf is \(120\ \mu\text{m}\) thick. The diffusion coefficient of \(\text{CO}_2\) in air is \(1.6 \times 10^{-5}\ \text{cm}^2\text{s}^{-1}\). Assuming steady‑state diffusion and using the relation \(t = \dfrac{L^{2}}{2D}\), calculate the time required for \(\text{CO}_2\) to diffuse across the layer. Express your answer in milliseconds (ms) to two significant figures.

A. 2.3\\times10^{3}\\ ms

B. 1.5\\times10^{3}\\ ms

Correct Answer C. 4.5\times10^{3}\ ms

D. 9.0\\times10^{3}\\ ms

Correct Answer

Correct Option:

4.5\times10^{3}\ ms

This is Neco 2018 Biology Question 40. It is one of the objective questions from the 2018 Neco Biology examination.

Difficulty level: Medium .

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