Unicellular organisms carry out all life processes within one cell. Review nutrition, metabolism, response, excretion, homeostasis, growth and reproduction, using Amoeba, Chlamydomonas and Escherichia coli as examples.
Excretion is one of the functions of life.
Compare and contrast excretion in humans and unicellular organisms such as Paramecium.
Similarities:
a. both expel CO2 /toxins/nitrogenous waste/waste products of metabolism;
Differences:
b. Paramecium does not have special organs for excretion OR
humans do have (special) organs/kidneys/lungs/skin/liver for excretion;
c. unicells/Paramecium excrete through their plasma membrane;
d. (entirely) passive/by diffusion in unicells/Paramecium but humans use energy/active transport (to move blood/air/solutes);
e. humans excrete urea whereas Paramecium excretes ammonia;
Marking guidance:
Reject answers stating that Paramecium excretes waste products by exocytosis.