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Environment and Ecology Part 1.2

Lesson 2 of 18 • 2169 upvotes • 22:02 mins

Roman Saini

High Yield Series: All the important topics irrespective of subject, extremely beneficial for cracking IAS. Humbled and Baffled by the sheer response of the awesome IAS Aspirants' Community, here is a life saver for environment section. Watch it and forget everything else. This video is covering essentials of Environment and Ecology: Ecological succession- definition, 5 stages, followed by population interaction: Mutualism, Competition, Amensalism, Predation, Parasitism, Commensalism. Do let me know if you want me to keep on making these videos, message me on my official page. In this video, Dr. Roman deals with Ecological Succession: Simple Definition, Primary ES, Secondary ES, Serule, Pioneer to Climax species, Cyclic succession, Primary autotrophic succession, Sequence: Gleason - Nudation, Invasion: Migration, Ecesis, Aggregation, Competition and Coaction, Reaction, Stabilisation: Climax, Retrogressive Succession, Human actions, Climate - Ice age, Forest fires - Savannah, Volcanic eruption - Magma, Climax Species, Complex food chain, Polyclimax theory, Population interaction: Mutualism, Competition, Amensalism, Predation, Parasitism, Commensalism, Predation: Species diversity, Pisaster starfish, Predator efficiency, Defense mechanism of prey, Competition: Darwin’s definition, Competitive release, Gause’s ‘Competitive Exclusion Principal’, Parasitism: Co-evoluion of host and parasite, Complex life cycle, Types of parasites: Eeto, Cuscuta, Endo, Brood, Commensalism: Orchid, Mango – unaffected, Cattle egret and grazing cattle, Sea anemone, Mutualism - Mycorrhizae, Lichen: Algae & Fungi, Pollination, Co-evolution, Fig, Mediterranean Orchid: Pseudocopulation Unacademy, an educational initiative by Gaurav Munjal and Roman Saini. Visit us at or tweet to us @theunacademy. Video by Unacademy for IAS Preparation. How to prepare for IAS exam, Best IAS Coaching, IAS Civil Services Syllabus, Study Material for IAS Exam, IAS Civil Services Exam, UPSC Preparation, Tips for IAS, Material for IAS Preparation, UPSC Exam Material, IAS How to prepare, Other good resources: Mrunal and Clearias , IAS preparation tips, How to prepare for IAS 2015