Sign up now
to enroll in courses, follow best educators, interact with the community and track your progress.
Environment and Ecology Part 1.2
43,377 plays

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

Roman Saini is teaching live on Unacademy Plus

Roman Saini
Part of a great founding team at Unacademy with Gaurav, Hemesh. Movies, Guitar, Books, Teaching.

Unacademy user
Sir in this egalterian society where every person is think about their self only you think about the mass of the students who are not capable to join these high profile expensive are doing a Nobel work sir I'm not seen any beurocrat doing such type of work our blessings is only belongs to you sir please keep going and educate us
do anybody need to add water to ocean..and do anybody need to add air to cyclone..and do anybody need to light a fire to an valcano... similarly no one need to you are god's gift to us...your lessons are most most of poor people are even thinking to clear UPSC...only bcoz of you....
Female Anopheles just spreads parasitic Plasmodium(which is present in its salivary glands) hence it is called Vector. The actual parasite is Plasmodium here.
Susanta Kar
3 years ago
where from u??
Mithra Pamaraju
3 years ago
It also does not reside inside or on the host. :)
Abhishek Kumar
3 years ago
Females need blood for the nourishment of their eggs, they don't need blood to survive. As male mosquitoes never thrive for blood.
Thank you Sir. Just as a vector transmits disease or parasite from one animal or plant to the other, The female Anopheles mosquito transmits the malarial parasite called plasmodium vivax to the human body. Hence, they are categorized as a vector. Also, they are not called a parasite because they stay on the body for a very short time frame, not enough to be categorized as a parasite and they suck the human blood only for reproduction.
A parasite is defined as an organism which lives in or on another organism (its host) and benefits by deriving nutrients at the other's expense. The parasite has to be in its host to live, grow, and multiply. The female mosquito is not a parasite as they just feed on blood as part of their reproductive cycle. It does not need to live on the host in order to survive.
Ankit gupta
3 years ago
what is a host, please define the simple terms?
Abhishek Kumar
3 years ago
man lo apke ba me lice (ju) ho gaya to wo apka khun pi ke jinda rahegi. Tab ju ko parasite kahenge or apko host. I hope aap samajh gay honge.
View More