A) What is excretion?

Here are the answers to question 5:

a) What is excretion?
Excretion is the process by which living organisms eliminate metabolic waste products and other non-useful substances from their bodies.

b) State two excretory products in plants.

• Oxygen
• Water vapor

c) State two excretory products in animals.

• Urea
• Carbon dioxide

d) Name two excretory organs in mammals.

• Kidneys
• Lungs

e) State two ways in which the kidney is adapted to its function.

• The kidney contains millions of nephrons, which are the functional units responsible for filtering blood and forming urine.
• It has a rich blood supply via the renal artery, ensuring efficient filtration of blood.