Photic Zone Photic Zone
Explore revision notes, and key facts for Factors affecting productivity: Photic Zone in UPSC Civil Services Environment preparation on Photic Zone पर UPSC सिविल सेवा परीक्षा अध्ययन गाइड।
Marine Zonation: Photic vs. Aphotic Zoneसमुद्री क्षेत्र: प्रकाश मंडल (Photic Zone) एवं अप्रकाश मंडल (Aphotic Zone)
Vertical ocean layers categorized by sunlight penetration, governing primary biological productivity, phytoplankton photosynthesis, and aquatic biodiversity distribution.
Core Concepts & Provisionsमुख्य अवधारणाएँ एवं संवैधानिक प्रावधान
Conceptual Foundations & Ecosystem Principlesमूल अवधारणाएं एवं पारिस्थितिक सिद्धांत
Vertical ocean layers categorized by sunlight penetration, governing primary biological productivity, phytoplankton photosynthesis, and aquatic biodiversity distribution.
Salient Provisions, Adaptations & Mechanismsप्रमुख प्रावधान, अनुकूलन एवं कार्यप्रणाली
• Photic (Euphotic) Zone: Extends from ocean surface down to where light intensity falls to ~1% of surface value (typically 0 to 200 meters in clear waters). Supports 90% of all marine life and all photosynthetic activity.
• Compensation Depth: Depth where photosynthetic rate equals respiratory rate (Net primary productivity = 0).
• Aphotic Zone: Region below 200m depth where sunlight cannot penetrate; sustained by marine snow (detritus drifting down from photic zone) and chemosynthesis (hydrothermal vents).