Question

It is not advisable to sleep under a tree at night because of the}

• A. release of less oxygen
• B. release of more oxygen
• C. release of carbon dioxide
• D. release of carbon monoxide

Hint:

Quick memory trick: - \textbf{Day} = Photosynthesis → \(CO_2\) in, \(O_2\) out (good for sleeping nearby) - \textbf{Night} = Respiration only → \(O_2\) in, \(CO_2\) out (avoid sleeping directly under)

Answer 1

The Correct Option is C

Concept: Green plants carry out respiration continuously, while photosynthesis occurs only in the presence of sunlight. Respiration releases carbon dioxide and consumes oxygen, whereas photosynthesis uses carbon dioxide and releases oxygen. Step 1:Analyzing plant activity in light and dark conditions.

• During daytime: Photosynthesis is active and exceeds respiration, leading to a net release of oxygen.
• During nighttime: Photosynthesis stops due to absence of light, and only respiration continues, resulting in release of carbon dioxide.

Step 2:Reason for avoiding sleeping under a tree at night.
At night, trees release \(CO_2\) and take in \(O_2\). In areas with limited ventilation, this can cause:

• Build-up of \(CO_2\) in the surrounding air
• Reduction in available oxygen
• Breathing difficulty or suffocation in extreme situations

Step 3:Checking the given options.

• (A) release of less oxygen: Incorrect, as the concern is carbon dioxide emission.
• (B) release of more oxygen: Incorrect, since oxygen is not produced at night.
• (C) release of carbon dioxide: Correct, as respiration releases \(CO_2\).
• (D) release of carbon monoxide: Incorrect, as plants do not emit carbon monoxide.

Step 4:Conclusion.
Sleeping under a tree at night is not advisable because trees release carbon dioxide during respiration, which may be harmful in poorly ventilated conditions. The correct answer is (C).