WAEC - Biology (2000 - No. 1)
Amoeba obtains its oxygen requirements
from oxidising food substances
from air trapped in vacuoles
through diffusion of air into its body
through an air cavity in the ectoplasm
Εξήγηση
Amoeba obtain oxygen from the water around them through a process called diffusion.Oxygen gas dissolved in the water passes through the amoeba's plasma membrane and into its body. The amoeba uses the oxygen for respiration and to break down food into simpler molecules. Carbon dioxide produced by the amoeba is excreted back into the surrounding environment through diffusion, and because amoeba are small, the oxygen spreads quickly throughout their bodies.