Question

Which of the following is not a feature of an efficient gas exchange surface ?

• A. thick walls
• B. close proximity to blood capillaries
• C. moist lining
• D. large surface area

Answer 1

The correct option is A thick walls

Gaseous exchange occurs when a large surface is provided which increases the quantity and quality of exchange with a moist lining which helps in capturing impure substances and also close to blood capillaries which increases more solubility and transfer of gaseous substances. However, thick walls hinder gaseous exchange.

So, the correct option is 'thick walls'.