CHAPTER 3 EXCRETION SUBJECTIVE QUESTIONS 3.1 Human Excretion
1
Complete the table below by stating the method of excretion
and excretory materials for the following excretory organ.
Excretory organ Method of excretion Excretory materials
Fill in the blanks with the words given.
(a) The process of removing waste products, produced
during chemical processes in the cells, is called ___________________.
(b) If wastes are not removed, _____________ substances
build up and these can damage organs in the body.
are _____________ , carbon dioxide, urea and mineral salts.
(d) The excretory organs of humans are lungs, _________
3.2 The Urinary System in Humans
3
Tick the statements below that are true.
(a) The kidneys are located at the back of the body and
form the main organs of the urinary system.
(b) The function of the kidney is to remove water and
(c) The kidneys are bean-shaped and roughly the size of a
Name the parts of the human urinary system based on the
Parts of urinary Function system in human
Tube that carries urine from the kidney to the bladder
Excretory organ that removes wastes like urea,water and mineral salts from the blood into the urine
Tube that carries urine from the bladder for removal
Temporary storage for the urine before removal
Label the human kidney using the words given.
Cortex Ureter Medulla Vein Pelvis of kidney
3.3 Excretion in Plants 6
Underline the correct word in the brackets so that each
(a) Plants excrete water, [urea, mineral salts], oxygen,
carbon dioxide and other nitrogenous wastes.
(b) Plants excrete their waste products by simple diffusion
through the cell [wall, membrane] and through the stomata.
OBJECTIVE QUESTIONS 3.1 Human Excretion
1
Which of the following excretory products are excreted
All the following are excretory organs except
3.2 The Urinary System in Humans
3
Which of the following is not a function of the kidneys?
It regulates the amount of water and mineral salts in the body
Diagram 1 shows the cross section of the human kidney.
Which part marked P, Q, R and S carries urine from the kidney to the urinary bladder?
Which of the following are not true? Excretory product Excretory organ
3.3 Excretion in Plants 6
Which of the following excretory products from plants can be
Which of the following plants produce latex?
REVISION
1
Which of the following excretory product does not match? Excretory organs Excretory product
Diagram 1 shows the human urinary system.
__________________________________________
(c) Describe what happens to the body when both kidneys
__________________________________________ __________________________________________
(d) State how kidney failure can be treated.
__________________________________________ __________________________________________ 4
The following information describes the excretion of plants.
Some of the excretory products in plants
___________________________________________
___________________________________________
Name the parts of plants that will eliminate the
_______________________________________
________________________________________
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(c) The kidneys are bean-shaped and roughly the size of a
Name the parts of the human urinary system based on the
Parts of urinary 
Which part marked P, Q, R and S carries urine from the kidney to the urinary bladder?
Which of the following are not true? 
REVISION