Advanced Science Primary 6 Energy

A plant was left in a sealed glass container for 24 hours in a dark room. What happened to the level of oxygen in the container?

A It remained the same.
B It increased.
C It decreased.
D It increased then decreased.
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Worked Solution

Step 1: In the dark, the plant cannot perform photosynthesis. Step 2: However, it continues to carry out respiration to stay alive. Step 3: Respiration consumes oxygen, so the oxygen level decreases.

Correct answer: It decreased.

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