Energy Keeps an Ecosystem Functioning

Duration: 14 min

This video lesson is available to enrolled students.

Return to /learn/CTET-PAPER-1/environmental-studies/environment/energy-flow-trophic-levels-pyramids-10-lawbasic/asset-energy-keeps-an-ecosystem-functioning after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. Child Development and Pedagogy: Concept of Pedagogy, बालक कैसे सोचते एवं सीखते हैं / How Children Think and Learn, विकास की अवधारणा / Concept of Development, विकास के मनोवैज्ञानिक सिद्धांत / Psychological Theories of Development, Personality Development, व्यक्तिगत भिन्नताएँ, व्यक्तित्व एवं जेंडर / Individual Differences, Personality and Gender, संवेग, अभिप्रेरणा, मानसिक स्वास्थ्य एवं निर्देशन / Emotion, Motivation, Mental Health and Guidance, Understanding Diverse Learners, समावेशी शिक्षा / Inclusive Education, Mental Health & Life Skills, शिक्षण-अधिगम प्रक्रिया / Teaching-Learning Process, शिक्षण विधियाँ एवं रणनीतियाँ / Teaching Methods and Strategies, Experiential Pedagogy, आकलन एवं मूल्यांकन / Assessment and Evaluation, शैक्षिक विचारक, उद्देश्य एवं राष्ट्रीय नीतियाँ / Educational Thinkers, Aims and National Policies, Curriculum Framework & Reforms, Miscellaneous Topics, Learners & Learning Process, Factors Affecting Teaching, कक्षा प्रबंधन और सम्प्रेषण / Classroom Management and Communication, शिक्षण संसाधन और शैक्षिक प्रौद्योगिकी / Teaching Resources and Educational Technology, पाठ्यचर्या और विद्यालयी गतिविधियाँ / Curriculum and School Activities, Evaluation, Assessment & Measurement, Inclusive Education & Special Needs, अधिगम एवं इसके सिद्धांत / Learning and Its Theories, बुद्धि एवं सृजनात्मकता / Intelligence and Creativity
  2. Mathematics: Number System & Place Value, Whole Numbers & Four Operations, Factors, Multiples, Divisibility, HCF & LCM, Fractions & Decimals, Patterns, Ratio, Proportion & Percentage, Measurement — Length, Mass, Capacity, Time, Money, Geometry — Shapes, Lines & Angles, Symmetry, Spatial Understanding, Mensuration — Perimeter, Area, Surface Area, Volume, Data Handling, Graphs & Probability, Mathematics Pedagogy, HCF LCM, भिन्न एवं दशमलव / Fractions & Decimals, गुणनखंड, विभाज्यता, म.स.प. एवं ल.स.प. / Factors, Divisibility, HCF & LCM, प्रतिशत, लाभ-हानि एवं ब्याज / Percentage, Profit–Loss & Interest, अनुपात, समानुपात, औसत एवं आयु / Ratio, Proportion, Average & Ages, समय-कार्य एवं चाल-दूरी / Time & Work and Speed–Distance, बीजगणित / Algebra, त्रिभुज, चतुर्भुज, वृत्त एवं त्रिकोणमिति / Triangles, Quadrilaterals, Circles & Trigonometry, क्षेत्रमिति: परिमाप, क्षेत्रफल एवं आयतन / Mensuration: Perimeter, Area & Volume, आँकड़ा प्रबंधन, सांख्यिकी एवं प्रायिकता / Data Handling, Statistics & Probability, निर्देशांक, त्रिकोणमिति एवं उच्चतर गणित / Coordinates, Trigonometry & Higher Mathematics, गणित शिक्षणशास्त्र / Mathematics Pedagogy, संख्या पद्धति एवं स्थानीय मान / Number System & Place Value, रेखाएँ, कोण, आकृतियाँ एवं निर्देशांक / Lines, Angles, Shapes & Coordinates, मूलभूत संक्रियाएँ, सरलीकरण एवं पैटर्न / Basic Operations, Simplification & Patterns, मापन: लंबाई, भार, धारिता, समय एवं मुद्रा / Measurement: Length, Mass, Capacity, Time & Money, वर्ग, घन, घातांक एवं करणी / Squares, Cubes, Exponents & Surds
  3. Environmental Studies: परिवार, मित्र और समुदाय / Family, Friends and Community, पौधे / Plants, EVS Pedagogy, जंतु / Animals, खेती और पशुपालन / Farming and Animal Husbandry, भोजन और पोषण / Food and Nutrition, शरीर और स्वास्थ्य / Body and Health, जल / Water, आवास / Shelter, यात्रा, परिवहन और संचार / Travel, Transport and Communication, मानचित्र, दिशाएँ और भारत / Maps, Directions and India, हम क्या बनाते और करते हैं / Things We Make and Do, पृथ्वी, आकाश और आपदाएँ / Earth, Sky and Disasters, पर्यावरण, पारिस्थितिकी और वन्यजीव / Environment, Ecology and Wildlife, प्राकृतिक संसाधन, प्रदूषण और जलवायु परिवर्तन / Natural Resources, Pollution and Climate Change, पर्यावरण अध्ययन का शिक्षणशास्त्र / Pedagogy of Environmental Studies, Water Pollution, Ecosystem, Biomes & Environmental Issues, Soil, Environment, Air Pollution, Noise Pollution and Waste Management, Natural Resources, Energy & Disaster Management, Global Environmental Conventions – COP, Protocols & ISA, MDG & SDG
  4. Language I/II — Hindi: भाषा, लिपि और वर्ण-विचार, संधि, शब्द-स्रोत और शब्द-रचना, समास, शब्द-भेद: विकारी और अविकारी, लिंग, वचन, कारक, काल और वाच्य, वाक्य-विचार और शुद्ध लेखन, शब्द-भंडार, रस, छंद, अलंकार और शब्द-शक्ति, हिंदी साहित्य, अपठित बोध, हिंदी शिक्षणशास्त्र
  5. Language I/II — English: Sounds, Spelling and Word Formation, Parts of Speech, Nouns and Pronouns, Articles, Determiners and Adjectives, Verbs and Modals, Tenses and Subject–Verb Agreement, Adverbs, Prepositions and Conjunctions, Sentence Structure, Voice and Narration, Vocabulary, Sentence Correction and Writing Skills, Poetry and English Literature, Reading Comprehension, Pedagogy of English Language
  6. Language I/II — Sanskrit: वर्णविचारः एवं संज्ञाप्रकरणम्, सन्धिप्रकरणम्, शब्दरूपाणि, धातुरूपाणि, कारकाणि एवं विभक्तयः, उपसर्गाः एवं अव्ययानि, प्रत्ययप्रकरणम्, समासप्रकरणम्, वाच्यप्रकरणम्, संख्याज्ञानम्, शब्दज्ञानम् एवं अनुवादः, अपठितावबोधनम्, संस्कृतसाहित्यम् एवं काव्यशास्त्रम्, संस्कृतशिक्षणशास्त्रम्
  7. Language I/II — Urdu: ذخیرۂ الفاظ, قواعد, محاورے اور ضرب الامثال, تفہیمِ عبارت, شعر و سخن, رسم الخط، املا اور تلفظ, اردو ادب کی تاریخ, اردو کی تدریس
  8. Language I/II — Bengali: ভাষা, ধ্বনি ও বর্ণ, সন্ধি ও বানান, শব্দের উৎস ও গঠন, সমাস, পদ পরিচয়, কারক ও বিভক্তি, ক্রিয়া ও কাল, বাক্যতত্ত্ব, শব্দার্থ ও বাগর্থ, পাঠ অনুধাবন ও সাহিত্য, নির্মিতি ও পত্রলিখন
  9. Language Pedagogy (Language I and II): Language Pedagogy (Hindi/English/Sanskrit/Urdu learning & teaching)
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This bilingual English-Hindi lecture explains how energy sustains ecosystem functioning. It begins by defining energy use in organisms, then introduces Photosynthetically Active Radiation (PAR) and its limits, and finally establishes unidirectional energy flow with heat dissipation. The instructor uses red annotations to highlight exam-relevant values such as 400–700 nm, less than 50%, and 2–10% PAR capture.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The opening slide, titled 'Energy Keeps an Ecosystem Functioning,' states that organisms use energy for growth, repair, movement, and reproduction. It identifies sunlight as the initial energy source captured by producers and notes that photosynthesis converts light energy into chemical energy. The instructor underlines key terms like 'movement' and 'sunlight,' and writes 'J' and 'kJ' beside the bullet stating energy is measured in joules or kilojoules. An exam focus on chemosynthetic production is also listed.

  2. 2:00 – 5:00 02:00-05:00

    The lesson transitions to the slide 'Only Part of Sunlight Supports Photosynthesis,' which explains that not all incoming solar radiation is equally useful. The relevant portion is defined as Photosynthetically Active Radiation, or PAR. Important points state the conventional PAR range is approximately 400–700 nanometres, NCERT describes PAR as less than 50% of incident solar radiation, and gives a broad estimate of 2–10% PAR capture by plants. Red handwritten marks box '400–700,' circle 'PAR' and '50%,', and underline '2–10% PAR capture by plants.'

  3. 5:00 – 10:00 05:00-10:00

    The PAR slide remains on screen with accumulated red annotations underlining 'Photosynthetically Active Radiation, or PAR' and circling the key percentages. The video then switches to a new slide titled 'Energy Flows in One Direction,' which displays a food-chain diagram of grass, deer, lion, vulture, and decomposers with upward heat arrows. This transition shifts the focus from the quantity of usable sunlight to the directional movement of energy through trophic levels.

  4. 10:00 – 14:08 10:00-14:08

    The 'Energy Flows in One Direction' slide explains that energy enters an ecosystem, passes through organisms, and is gradually dissipated as heat, a process called unidirectional energy flow. It contrasts cycling nutrient atoms with dissipated heat that does not return as usable food energy. The instructor underlines 'unidirectional energy flow' and the bullet 'All living groups dissipate energy as heat.' Handwritten red figures '100, 75, 50, 25' appear beside the decomposer image, and the final frame returns to the title slide with a new diagram featuring a tiger and an aquatic ecosystem.

The lecture builds a logical sequence from energy input to energy loss. First, it establishes that all organisms require energy for basic life processes, with producers capturing sunlight via photosynthesis. Second, it quantifies the limitation of this input by defining PAR (400–700 nm) and noting that plants capture only 2–10% of it. Third, it explains that once energy enters the ecosystem, it flows in one direction through feeding and decomposition pathways, with all living groups dissipating energy as heat. The key distinction drawn is between nutrient atoms, which can cycle, and dissipated heat, which cannot return as usable food energy. The handwritten numbers 100, 75, 50, 25 likely illustrate decreasing energy availability at successive trophic levels, though the exact context is partially visible. The recurring emphasis on NCERT estimates and exam focus suggests this is a revision-oriented lesson for a biology curriculum.

Loading lesson…