Higher plants utilize light energy for photosynthesis at an efficiency of:
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Answer: D. 1
Explanation
Higher plants convert only about one percent of incident solar radiation into chemical energy via photosynthesis. Most incoming sunlight is reflected, transmitted through leaves, or lost as thermal infrared radiation. Photosynthetic efficiency remains low despite plants being the primary producers supporting global food webs. Photosynthesis is the biochemical process where plants capture light energy to synthesize glucose from carbon dioxide. Solar radiation reaching Earth spans a wide electromagnetic spectrum, but pigments only absorb specific wavelengths. Metabolic respiration by plants consumes a significant portion of the chemical energy initially produced.
Crop scientists strive to breed plant varieties with improved photosynthetic efficiency to maximize food yields. Low photosynthetic efficiency limits the total biological productivity achievable within natural global ecosystems. Understanding energy conversion limits helps agronomists calculate maximum theoretical agricultural production ceilings. One hundred percent efficiency violates the laws of thermodynamics regarding radiant energy conversion limits. Fifty percent efficiency is vastly exaggerated and exceeds the physiological limits of natural plant pigments. Ten percent efficiency is typically used to describe trophic energy transfer between animals rather than light capture.
- Subject
- Agriculture
- Category
- Forestry
- Topic
- —
- Difficulty
- medium
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