In the nighttime, it is advised not to sleep under trees because
Detailed Explanation:
During photosynthesis (daytime), plants absorb CO₂ and release O₂. At night, photosynthesis stops, but respiration continues—plants absorb O₂ and release CO₂, just like animals.
In enclosed or poorly ventilated spaces, this can slightly increase CO₂ levels and reduce oxygen concentration, making it uncomfortable to sleep under trees indoors or in confined areas.
Therefore, trees liberate carbon dioxide at night through respiration, making Option 3 the correct answer.
Question 19 of 20 Plant Physiology
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