Biology 09 - Food Chain And Food Web

Duration: 11 min

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Inside: a video lesson and guided study material.

Module outline

  1. About the course: About the Course
  2. Mathematical Aptitude / गणितीय अभिक्षमता: Number System / संख्या पद्धति, HCF and LCM / महत्तम समापवर्तक और लघुत्तम समापवर्त्य, Divisibility Rules / विभाज्यता के नियम, Percentage / प्रतिशत, Ratio and Proportion / अनुपात और समानुपात, Average / औसत, Profit, Loss and Discount / लाभ, हानि और बट्टा, Time and Work / समय और कार्य, Solid Mensuration / घन क्षेत्रमिति, Simple and Compound Interest / साधारण और चक्रवृद्धि ब्याज, Time, Speed and Distance / समय, चाल और दूरी, Age Problems / आयु संबंधी प्रश्न, Mixture and Alligation / मिश्रण और एलिगेशन, Algebra / बीजगणित, Simplification, Indices and Surds / सरलीकरण, घातांक और करणी, Pipe and Cistern / नल और टंकी, Trigonometry / त्रिकोणमिति, Statistics / सांख्यिकी, Data Interpretation / आँकड़ा निर्वचन, Arithmetic / अंकगणित, Sets, Relations, Functions and Discrete Mathematics / समुच्चय, संबंध, फलन और विविक्त गणित, Number Systems and Number Theory / संख्या पद्धति और संख्या सिद्धांत, Coordinate Geometry, Vectors and 3D Geometry / निर्देशांक ज्यामिति, सदिश और त्रिविमीय ज्यामिति, Polynomials, Equations and Complex Numbers / बहुपद, समीकरण और सम्मिश्र संख्याएँ
  3. Logical Reasoning / तार्किक तर्कशक्ति: Series / श्रेणी, Coding-Decoding / कूट लेखन एवं कूट वाचन, Analogy and Classification / सादृश्यता एवं वर्गीकरण, Blood Relations / रक्त संबंध, Direction and Distance / दिशा एवं दूरी, Order and Ranking / क्रम एवं रैंकिंग, Non-Verbal Reasoning / अशाब्दिक तर्क, Seating Arrangement and Puzzles / बैठक व्यवस्था एवं पहेलियाँ, Syllogisms / न्यायवाक्य, Venn Diagrams, Syllogism and Inequalities / वेन आरेख, न्याय वाक्य एवं असमानता, Mathematical Operations and Missing Numbers / गणितीय संक्रियाएँ एवं लुप्त संख्या, Alphabet and Number Test / वर्णमाला एवं संख्या परीक्षण, Statement-Based Reasoning / कथन आधारित तार्किक विवेचन, Analytical Reasoning (Counting Figures Reasoning) / विश्लेषणात्मक तर्क (आकृति गणना तर्क), Cubes, Dice and Figure Counting / घन, पासा एवं आकृतियों की गिनती, Calendar and Clock / कैलेंडर एवं घड़ी, Clock / घड़ी
  4. General Knowledge / सामान्य ज्ञान: Scientific Achievements and Research / वैज्ञानिक उपलब्धियाँ और अनुसंधान, Chemistry / रसायन विज्ञान, Biology / जीव विज्ञान, History / इतिहास, Geography / भूगोल, Polity / राजव्यवस्था, Indian Economy / भारतीय अर्थव्यवस्था, Current Affairs / समसामयिकी, Static General Knowledge / स्थैतिक सामान्य ज्ञान, State-Specific General Knowledge / राज्य विशेष सामान्य ज्ञान
  5. Art of Teaching / शिक्षण कला: Teaching-Learning Process and Classroom Management / शिक्षण-अधिगम प्रक्रिया एवं कक्षा प्रबंधन, Learners & Learning Process / अधिगमकर्ता और अधिगम प्रक्रिया, Factors Affecting Teaching / शिक्षण को प्रभावित करने वाले कारक, Teaching Methods and Approaches / शिक्षण विधियाँ एवं उपागम, Microteaching and Classroom Communication / सूक्ष्म शिक्षण एवं कक्षा संप्रेषण, Teaching Aids and Educational Technology / शिक्षण सहायक सामग्री एवं शैक्षिक तकनीकी, Assessment and Evaluation / आकलन एवं मूल्यांकन, Teacher: Qualities, Professional Ethics and Development / शिक्षक: गुण, व्यावसायिक नैतिकता एवं विकास, Educational Policies, Acts and Administration / शैक्षिक नीतियाँ, अधिनियम एवं प्रशासन, Curriculum, Arts and Co-curricular Areas / पाठ्यचर्या, कला एवं सह-शैक्षिक क्षेत्र, Guidance and Counselling / निर्देशन एवं परामर्श, Education of Children with Disabilities / दिव्यांग बच्चों की शिक्षा, Micro-Teaching & Teaching Skills / सूक्ष्म शिक्षण और शिक्षण कौशल, Lesson Planning / पाठ योजना
  6. Environmental Science / पर्यावरण विज्ञान: Environment / पर्यावरण
  7. Unit 1 | Digital Electronics: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation
  8. Unit 2 | COA: Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations, Programming the Basic Computer
  9. Unit 3 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  10. Unit 3 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  11. Unit 4 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  12. Unit 5 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management
  13. Unit 6 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Transaction Management, Concurrency Control
  14. Unit 7 | Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer
  15. Unit 8 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  16. Unit 9 | Object Oriented Programming: OOPS with C++
  17. Unit 10 | Web Development: HTML Basics, CSS, JavaScript-Basics, XML, Node.js, Git & Github, PHP
  18. Unit 11 | Theory Of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines
  19. Unit 12 | IoT: Emerging Tech Trends, Cloud Computing, Computer Networks, Internet of Things
  20. Unit 13 | Artificial Intelligence: Approaches to AI, Search Algorithms, Game Playing, Knowledge Representation, Natural Language Processing, Artificial Neural Networks, Genetic Algorithms
  21. Unit 14 | E-Commerce: Electronic Data Interchange and E-Commerce, Role of Internet and Web Services, Security in Mobile and Wireless Computing, Physical Security and Cryptography Basics, Cyber Safety and Security
  22. Unit 15 | Multimedia: Multimedia
  23. Unit 16 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis, DSA using Python
  24. Full Length Mock Tests — General Paper:
  25. Full Length Mock Tests — Computer Science (Paper II):
  26. Full Length Mock Test – General + Computer Science:
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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