PSLE Science Made Simple: Body System Quiz

Why is it important to know that the glass jar is sealed?

• To keep the jar clean

• To ensure no air enters or exits the jar

• To maintain a constant temperature

• To prevent the lizard from escaping

What gas does the lizard primarily take in for respiration?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

During respiration, what happens to the levels of carbon dioxide in the jar?

• They fluctuate

• They decrease

• They remain constant

• They increase

Which trend should you look for in the graph to represent oxygen levels?

• Increasing trend

• Fluctuating trend

• Decreasing trend

• Stable trend

Why is it important to consider the starting volume of gases?

• To measure the lizard's health

• To accurately compare gas changes

• To predict future gas levels

• To determine the jar's size

What is the approximate percentage of oxygen in the air we breathe in?

• 21%

• 4%

• 0.03%

• 100%

In the air we breathe out, what is the approximate percentage of carbon dioxide?

• 100%

• 0.03%

• 4%

• 21%

Which option correctly shows oxygen having a higher starting point?

• Option Two

• Option One

• Option Three

• Option Four

What is the main reason Option Three is incorrect?

• Carbon dioxide decreases

• Oxygen has a lower starting point

• Oxygen increases

• Carbon dioxide remains constant

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