Heliophile plants require mean maximum illumination of:

by

Heliophile plants require mean maximum illumination of:

30,000 lux.
20,000 lux.
10,000 lux.
40,000 lux.
This question was previously asked in
UPSC Geoscientist – 2020
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Heliophile plants, also known as sun-loving plants, require high light intensity for optimal growth. While the exact threshold varies depending on the source and context, values around 30,000 lux or higher are typically associated with conditions suitable for heliophytes.
Heliophile plants are adapted to thrive in direct sunlight and require high illumination levels for maximum photosynthetic activity.
In contrast, sciophyte plants (shade-tolerant plants) require much lower light intensities, often below 5,000 lux. The mean maximum illumination experienced by plants varies significantly depending on latitude, time of day, season, and environmental factors like cloud cover and canopy shading. Full sunlight can exceed 100,000 lux.

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