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: Plants undergo two main processes: photosynthesis (daytime) and respiration (always). Photosynthesis consumes carbon dioxide and releases oxygen, while respiration consumes oxygen and releases carbon dioxide. Step 1:Understanding plant behavior during day and night.}

• Daytime: Photosynthesis \(>\) Respiration. Plants release net oxygen.
• Nighttime: Photosynthesis stops (no sunlight). Only respiration occurs. Plants release carbon dioxide and consume oxygen.

Step 2:Why sleeping under a tree at night is dangerous.}
At night, trees release carbon dioxide (\(CO_2\)) and take in oxygen (\(O_2\)). Sleeping in an enclosed or poorly ventilated area under a tree can lead to:

• Increased \(CO_2\) concentration in the surrounding air
• Reduced \(O_2\) availability
• Headaches, dizziness, or suffocation in extreme cases

Step 3:Evaluating each option.}

• (A) release of less oxygen: Incorrect wording. The issue is not "less oxygen release" but active release of \(CO_2\).
• (B) release of more oxygen: False. Trees do not release more oxygen at night.
• (C) release of carbon dioxide: Correct. At night, respiration dominates, releasing \(CO_2\).
• (D) release of carbon monoxide: False. Carbon monoxide (\(CO\)) is released by incomplete combustion (vehicles, fire), not by trees.

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