Biology 09 - Food Chain And Food Web

Duration: 11 min

This video lesson is available to enrolled students.

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Inside: a video lesson and guided study material.

Module outline

  1. About the Course: About the Course
  2. Paper-1 & 2 | Basic Numeracy: अनुपात और समानुपात / Ratio and Proportion, Divisibility Rules, मिश्रण और एलिगेशन / Mixture and Alligation, Permutation and Combination, Logarithm, संख्या पद्धति / Number System, महत्तम समापवर्तक और लघुत्तम समापवर्त्य / HCF and LCM, Sequence and Series (Series), समय, चाल और दूरी / Time, Speed and Distance, प्रतिशत / Percentage, औसत / Average, घन क्षेत्रमिति / Solid Mensuration, Age Problems, Arithmetic, Statistics, Probability, लाभ, हानि और बट्टा / Profit, Loss and Discount, साधारण और चक्रवृद्धि ब्याज / Simple and Compound Interest, Partnership, Speed Mathematics and Basic Mathematics, Algebra, सरलीकरण, घातांक और करणी / Simplification, Indices and Surds, समय और कार्य / Time and Work, Pipe and Cistern, RSSB Specific Videos - Basic Numeracy, समुच्चय, संबंध, फलन और विविक्त गणित / Sets, Relations, Functions and Discrete Mathematics, संख्या पद्धति और संख्या सिद्धांत / Number Systems and Number Theory, निर्देशांक ज्यामिति, सदिश और त्रिविमीय ज्यामिति / Coordinate Geometry, Vectors and 3D Geometry, बहुपद, समीकरण और सम्मिश्र संख्याएँ / Polynomials, Equations and Complex Numbers
  3. Paper-1 & 2 | Data Interpretation: आँकड़ा निर्वचन / Data Interpretation
  4. Paper-1 & 2 | General Mental Ability: Mental Ability, RSSB Specific Videos - Mental Ability
  5. Paper-1 & 2 | Logical Reasoning and Analytical Ability: श्रेणी / Series, कूट लेखन एवं कूट वाचन / Coding-Decoding, Data Sufficiency, अशाब्दिक तर्क / Non-Verbal Reasoning, Syllogisms, बैठक व्यवस्था एवं पहेलियाँ / Seating Arrangement and Puzzles, रक्त संबंध / Blood Relations, दिशा एवं दूरी / Direction and Distance, Analytical Reasoning (Counting Figures Reasoning), गणितीय संक्रियाएँ एवं लुप्त संख्या / Mathematical Operations and Missing Numbers, कैलेंडर एवं घड़ी / Calendar and Clock, Clock, घन, पासा एवं आकृतियों की गिनती / Cubes, Dice and Figure Counting, वेन आरेख, न्याय वाक्य एवं असमानता / Venn Diagrams, Syllogism and Inequalities, सादृश्यता एवं वर्गीकरण / Analogy and Classification, क्रम एवं रैंकिंग / Order and Ranking, कथन आधारित तार्किक विवेचन / Statement-Based Reasoning, Data Arrangement, वर्णमाला एवं संख्या परीक्षण / Alphabet and Number Test, Crypt Arithmetic
  6. Paper-1 & 2 | Decision Making and Problem Solving: आँकड़ों की पर्याप्तता एवं निर्णय क्षमता / Data Sufficiency and Decision Making
  7. Paper-1 | General Science: वैज्ञानिक उपलब्धियाँ और अनुसंधान / Scientific Achievements and Research, Biology, Chemistry, RSSB Specific Videos
  8. Paper-1 | General Awareness: राज्य विशेष सामान्य ज्ञान / State-Specific General Knowledge, समसामयिकी / Current Affairs
  9. Paper-2 | Fundamentals of Computer: Basics of COA, Number System, Floating Point Rep, Number Representation
  10. Paper - 2 | Digital Logic Systems: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits
  11. Paper-2 | Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Linux OS, Distributed Systems
  12. Paper-2 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, Relational Calculus, File Organization & Indexing, Transaction Management, Concurrency Control
  13. Paper-2 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  14. Paper-2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  15. Paper 2 | Oops, C++, Java: Language Design, OOPS with C++, Java, .Net Programming, Java Fundamentals
  16. Paper 2 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  17. Paper 2 | Emerging Trends and AI: Emerging Tech Trends, कंप्यूटर के मूल सिद्धांत / Computer Fundamentals, व्यापार, विपणन एवं उपभोक्ता संरक्षण / Trade, Marketing and Consumer Protection, कंप्यूटर नेटवर्क / Computer Networks
  18. Paper-2 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Advanced Algorithms
  19. Paper 2 | Data Communication and Network Security: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security, Ethical Hacking
  20. Paper-2 I Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  21. Paper-2 | Computer Organization and Architecture: Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations
  22. Paper-2 | Web Development: JavaScript-Basics, HTML Basics, CSS, XML
  23. Pedagogy: वृद्धि और विकास / Growth and Development, Concept of Pedagogy, संज्ञानात्मक प्रक्रियाएँ / Cognitive Processes, विकास के सिद्धांत / Theories of Development, समावेशी शिक्षा / Inclusive Education, Experiential Pedagogy, समाजीकरण और जेंडर / Socialisation and Gender, National Education Policy (NEP) 2020
  24. Live Sessions: RSSB Live Sessions
  25. RSSB Paper 1 - Full Mock Tests:
  26. RSSB Paper 2 - Full Mock Tests:
  27. SCI Previous Year Papers:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video presents a comprehensive lesson on food chains and food webs, structured as a lecture. The instructor begins by defining a food chain as a linear sequence showing how energy flows from one organism to another, using the example of Grass → Grasshopper → Frog → Snake → Eagle. The concept of a food web is introduced as a more complex and stable network of interconnected food chains. The video then details the trophic levels: producers (like grass), primary consumers (herbivores like grasshoppers), secondary consumers (carnivores like frogs), and tertiary consumers (top predators like eagles). Decomposers are also explained as organisms that recycle nutrients. A detailed food web diagram is displayed, illustrating the relationships between various organisms such as grass, rabbits, mice, grasshoppers, frogs, birds, owls, hawks, snakes, foxes, and eagles. The lecture transitions to a slide with 'Important Notes,' emphasizing that energy flow is one-way and that only about 10% of energy is transferred between trophic levels. Real-life examples are provided, including an aquatic food chain (Algae → Small fish → Big fish → Human) and a forest food web involving lions, tigers, and leopards. The video concludes with a 'Quick Recap' summarizing the key definitions and principles.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a slide titled 'Chapter 12: Food Chain and Food Web'. The instructor defines a food chain as a linear sequence showing how energy flows from one organism to another. An example is provided: Grass → Grasshopper → Frog → Snake → Eagle. The slide also introduces the concept of a food web, stating it is made of many interconnected food chains and is more stable than a simple food chain. The instructor explains the trophic levels: Producers, Primary consumers, Secondary consumers, and Tertiary consumers. A diagram on the right, labeled 'FOOD WEB', shows various organisms like grass, rabbits, mice, grasshoppers, frogs, birds, owls, hawks, snakes, foxes, and eagles, with arrows indicating the flow of energy between them. The instructor begins to explain the diagram, pointing out the relationships between the organisms.

  2. 2:00 – 5:00 02:00-05:00

    The instructor continues to analyze the food web diagram. He points out that the grass is a producer, and the rabbit, mouse, and grasshopper are primary consumers that eat the grass. He then identifies the frog as a secondary consumer that eats the grasshopper, and the snake as a tertiary consumer that eats the frog. The hawk is identified as a quaternary consumer that eats the snake. The instructor also points out that the fox eats the rabbit and the mouse, making it a secondary consumer. He explains that the owl eats the mouse and the bird, making it a secondary consumer as well. The instructor emphasizes that the food web is more stable than a simple food chain because if one species is removed, the others can still survive by eating other organisms. He also explains that decomposers, like bacteria and fungi, break down dead organisms and return nutrients to the soil.

  3. 5:00 – 10:00 05:00-10:00

    The instructor continues to explain the food web, pointing out that the bird eats the grasshopper, making it a secondary consumer. He also points out that the snake eats the bird, making it a tertiary consumer. The instructor then explains that the hawk eats the snake, making it a quaternary consumer. He also points out that the fox eats the rabbit and the mouse, making it a secondary consumer. The instructor emphasizes that the food web is more stable than a simple food chain because if one species is removed, the others can still survive by eating other organisms. He also explains that decomposers, like bacteria and fungi, break down dead organisms and return nutrients to the soil. The instructor then moves on to the next slide, which is titled 'Important Notes'.

  4. 10:00 – 11:03 10:00-11:03

    The video transitions to a new slide titled 'Important Notes'. The instructor explains that energy flow is always one-way, from plants to animals. He states that only 10% of energy is transferred from one trophic level to the next. The slide provides real-life examples: an aquatic food chain (Algae → Small fish → Big fish → Human) and a forest food web (Lions, tigers, leopards are all part of food webs in forests). The instructor then moves to a 'Quick Recap' section, summarizing the key points: a food chain is a linear path, a food web is a network of chains, and energy transfer is one-way and reduces at each level. The instructor concludes the lesson by summarizing the main concepts.

The video provides a clear and structured lesson on the flow of energy in ecosystems. It begins with the fundamental concept of a food chain, using a simple linear example to illustrate the transfer of energy. The lesson then builds complexity by introducing the food web, explaining its greater stability due to multiple interconnected pathways. The instructor systematically breaks down the trophic levels, using the provided diagram to show how organisms are classified as producers, primary, secondary, and tertiary consumers. A key principle highlighted is the 10% rule of energy transfer, which is a fundamental concept in ecology. The video effectively uses real-life examples and a final recap to reinforce the core ideas, making the complex topic of energy flow accessible and understandable for students.

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