You're viewing free preview questions — 4 questions previewing here — subscribe to unlock 80 more, plus the Full Question Bank, Mock Papers & Worksheets.Upgrade
Excretion and Homeostasis Introductory — Free MYP2 Sciences Practice Questions
1QuestionConcept of Excretion and Examples in HumansConcept Practice
4 marks~6 minCriterion A
The diagram shows the human digestive system, with the large intestine and kidneys labelled. Three waste products are listed below:
- Urea: produced from protein breakdown in body cells
- Undigested food: material that passes through the gut without being absorbed
- Carbon dioxide: produced during respiration
- Urea: produced from protein breakdown in body cells
- Undigested food: material that passes through the gut without being absorbed
- Carbon dioxide: produced during respiration
a
Identify which waste product is removed by the kidneys and which is removed by the large intestine. [2]
b
Excretion is the removal of metabolic waste — harmful substances made by chemical reactions inside body cells. Explain why removing urea from the body counts as excretion, but removing undigested food does not. [2]
Solutions
2QuestionRole of Kidneys and Urinary SystemAssessment Practice
3 marks~5 minCriterion B
The graph shows urine production (mL/h) against water intake (mL) for a healthy human over 6 hours. As water intake rises from 200 mL to 1200 mL, urine production rises from about 50 mL/h to about 300 mL/h.
a
Identify the relationship between water intake and urine production shown in the graph. [1]
b
Explain why urine production increases when water intake is high. Use the terms homeostasis and excess water removal in your answer. [1]
c
Compare how effectively the kidneys respond to water intake at 200 mL and at 1200 mL. Support your answer with values from the graph. [1]
Solutions
3QuestionConcept of Excretion and Examples in HumansAssessment Practice
4 marks~6 minCriterion C
During exercise, the body produces sweat — a liquid released through the skin. One student claims: "Sweating only removes water; it has no role in waste removal." A friend disagrees: "Sweating is a form of excretion."
a
State what excretion means. [1]
b
Identify which claim is more accurate and explain why, using the composition of sweat as evidence. [2]
c
Compare one advantage and one disadvantage of sweating as a method of waste removal. [1]
Solutions
4QuestionImportance of Maintaining Internal BalanceAssessment Practice
5 marks~8 minCriterion D
A student athlete plays soccer outdoors on a hot day. After one hour, she feels dizzy and has a headache. She drank only soda — a sugary, carbonated drink — instead of water throughout the game.
a
Identify one substance found in soda that affects the body's water balance differently than water does. [1]
b
Explain one reason why soda is less effective than water at replacing fluids lost through sweat during exercise. [2]
c
Compare the health risks for a young athlete who drinks soda instead of water during sport. [2]
Solutions
That's every free question here — 4 of 84.
+80 more questions, plus Mock Papers & Worksheets, are waiting in Premium.