Biology 5090 · O Level · Excretion

Excretion — practice question

(a)[8]

Describe and explain the way in which a protein molecule eaten in food is changed into urea and then removed from the body.

(b)[2]

Explain why carbon dioxide usually does not leave the leaves of a plant in daytime.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “broken down / digested / by hydrolysis” …