BiologyFundamental ConceptNCTB জীববিজ্ঞান অধ্যায় ১৩ (জীবের পরিবেশ ও বাস্তুতন্ত্র)

Ecosystem & Energy Flow

Bengali: বাস্তুতন্ত্র ও শক্তি প্রবাহ•Pronunciation: ইকোসিস্টেম অ্যান্ড এনার্জি ফ্লো•Symbol: \text{Ecosystem}

Standard Definition:

A structural and functional community where living biotic organisms interact with their non-living abiotic environment and exchange energy.

📐 Mathematical Equation, Units & Dimensions

Defining Mathematical Equation

E_{n+1} = 0.10 \times E_n \text{ (লিন্ডেম্যানের ১০\% সূত্র)}

Standard SI Unit

Energy: Joule (J)(শক্তি: জুল ($J$) বা ক্যালরি ($cal$))

Dimensional Analysis

[M L^2 T^{-2}]

CGS Unit

erg

📖 Physical Concept & Comprehensive Explanation

An ecosystem integrates biotic communities with abiotic environments. While nutrients cycle continuously, energy flow is strictly unidirectional. Lindeman's 10% ecological law asserts that only 10% of trophic energy passes to the subsequent feeding level, with 90% lost to metabolic respiration.

🎯 High-Yield Revision Points

✓Biotic components include producers, consumers, and decomposers.
✓Energy flow is strictly unidirectional; nutrient cycling is circular.
✓Lindeman's rule: only 10% of energy transfers between successive trophic tiers.