a. (i) Complete the table below with the respiratory surface of each of the listed organisms. organism respiratory surface Tadpole (2days old) Cockroach Dom...

(a)(i) Respiratory surfaces of the organisms

(a)(ii) Characteristics of respiratory surfaces

1. They have a large surface area for rapid gaseous exchange.
2. They are thin, usually one cell thick, giving a short diffusion distance.
3. They are moist so that oxygen and carbon dioxide can dissolve before diffusion.
4. They are permeable to respiratory gases.
5. They are well ventilated to maintain a steep concentration gradient.
6. In organisms with circulatory systems, they are richly supplied with blood capillaries.

(b) Respiratory organ of Tilapia: gill

The labelled drawing below should be made about 4 cm to 6 cm long.

The numerous gill filaments provide a large, thin, moist and richly supplied surface for gaseous exchange.