Zoology - Breathing and Exchange of Gases Question with Solution | TestHub

When percentage saturation of haemoglobin with O₂ is plotted against the pO₂, a sigmoid curve is obtained which is termed as oxygen dissociation curve.

A population growing in a habitat with limited resources show initially a lag phase, followed by phases of acceleration and deceleration and finally an asymptote, when the population density reaches the carrying capacity. A plot of N in relation to time (t) results in a sigmoid curve.