Lesson Worksheet: The Reproductive, Excretory, and Immune Systems Science • 4th Grade

In this worksheet, we will practice identifying the parts and describing the functions of the reproductive, excretory, and immune systems.


What is the purpose of the immune system?

  • ATo help bacteria reproduce (grow)
  • BTo help regulate body temperature
  • CTo help the body fight infection and disease
  • DTo help the body digest food


Which of these organs helps to prevent germs from entering our body?

  • AThe kidneys
  • BThe lungs
  • CThe stomach
  • DThe skin


Which cells help fight and kill germs in our bodies?

White blood cells inside vessel
  • AWhite blood cells
  • BRed blood cells
  • CSkin cells
  • DNerve cells


Which organ holds urine until it is excreted from the body through the urethra?

  • AThe kidneys
  • BThe ureters
  • CThe bladder


Complete the following sentence: Waste from the blood is filtered in the kidneys and mixed with water to form .

  • Aurine
  • Bbile
  • Csaliva
  • Dpancreatic juice


The immune system is located all over the body. Which of the following is not a part of the immune system?

  • ASkin
  • BWhite blood cells
  • CMucus in the nose
  • DMuscle tissue


Where are female egg cells produced?

  • AThe kidneys
  • BThe stomach
  • CThe ovaries
  • DThe bladder


Which body system is responsible for producing offspring?

  • AThe digestive system
  • BThe reproductive system
  • CThe skeletal system
  • DThe respiratory system


Which organ in our bodies stores urine?

  • AThe liver
  • BThe bowels
  • CThe kidneys
  • DThe bladder


What is the main function of the excretory system?

  • ATo help the body fight disease
  • BTo remove waste from our body
  • CTo take in oxygen and give off carbon dioxide
  • DTo help produce growth hormones

Practice Means Progress

Boost your grades with free daily practice questions. Download Nagwa Practice today!

scan me!

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.