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.

Q1:

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

Q2:

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

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

Q3:

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

Q4:

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

  • AThe kidneys
  • BThe ureters
  • CThe bladder

Q5:

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

  • Aurine
  • Bbile
  • Csaliva
  • Dpancreatic juice

Q6:

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

Q7:

Where are female egg cells produced?

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

Q8:

Which body system is responsible for producing offspring?

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

Q9:

Which organ in our bodies stores urine?

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

Q10:

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

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