Subhra Ranjan Video Lectures
ENVIRONMENT AND
ECOLOGY
Rushikesh Dudhat
Ankit Mohan
11-28-2019
, INDEX
0 Study Plan 3
1 Ecosystem and Ecology 4
1.1 Population 5
1.2 Species 5
1.3 Population Pyramid 8
2 Community 9
3 Biosphere 9
3.1 Biotic Interaction 8
4 Functions of Ecosystem 12
4.1 Ecosystem 11
4.2 Food Chain 20
4.3 Pyramid of Biomass 21
4.4 Ecological Succession 24
5 Gaseous Cycle 26
5.1 Nitrogen, Phosphorus, Sulphur Cycle 27
6 Ecotone 30
7 Ecological Niche 31
8 Biome 32
9 Wet Lands 41
9.1 Importance of wetlands 46
10 Aquatic Ecosystem 50
11 Biodiversity 52
11.1 Types of Biodiversity 53
11.2 Biodiversity Hotspot 57
11.3 How to protect biodiversity 59
12 Convention on Biodiversity 65
,https://telegram.me/upsc_iassquad << Download From >> https://telegram.me/upsc_iassqua
Study Plan
I. Ecology and Ecosystem -> Notes -> keywords for prelims
II. Biodiversity -> Factual in nature -> notes and ppt
III. Climate change -> Mains and Prelims ( Book)
Most Basic Book is 12th Biology NCERT (last 6 chapters)
Autotrophs the organism which can prepare their one food from sun
light (400nm to 700nm)
Heterotrophs the organism dependent on autotrophs for food.
When autotrophs and heterotrophs dies, they become food for
detritivores and decomposers.
Saprotrophs (Detritivores and Decomposers)
Detritivore is an organism that eats dead or decaying plants or
animals as food. Detritivores include microorganisms such as bacteria
and larger organisms such as fungi, insects, worms, and some
crustaceans.
Detritivores help to breaks complex organic matter into simple form
and after that Decomposers are organism that will further simplify
with the process of Humification and Mineralisation.
Google it:- https://ourstudycircle.in
, https://telegram.me/upsc_iassquad << Download From >> https://telegram.me/upsc_iassqua
1. Ecosystem and Ecology
❖ Levels of Organisation.
❖ Types of Ecosystem and Biomes.
❖ Eutrophication
• Levels of Organisation
BIOSPHERE
BIOMS
ECOSYSTEM
COMMUNITY
POPULATION
INDIVIDUAL
CELL
Fresh water ecosystem can be divided into Lotic (moving water) and
Lentic (stagnant water) ecosystem.
Google it:- https://ourstudycircle.in
ENVIRONMENT AND
ECOLOGY
Rushikesh Dudhat
Ankit Mohan
11-28-2019
, INDEX
0 Study Plan 3
1 Ecosystem and Ecology 4
1.1 Population 5
1.2 Species 5
1.3 Population Pyramid 8
2 Community 9
3 Biosphere 9
3.1 Biotic Interaction 8
4 Functions of Ecosystem 12
4.1 Ecosystem 11
4.2 Food Chain 20
4.3 Pyramid of Biomass 21
4.4 Ecological Succession 24
5 Gaseous Cycle 26
5.1 Nitrogen, Phosphorus, Sulphur Cycle 27
6 Ecotone 30
7 Ecological Niche 31
8 Biome 32
9 Wet Lands 41
9.1 Importance of wetlands 46
10 Aquatic Ecosystem 50
11 Biodiversity 52
11.1 Types of Biodiversity 53
11.2 Biodiversity Hotspot 57
11.3 How to protect biodiversity 59
12 Convention on Biodiversity 65
,https://telegram.me/upsc_iassquad << Download From >> https://telegram.me/upsc_iassqua
Study Plan
I. Ecology and Ecosystem -> Notes -> keywords for prelims
II. Biodiversity -> Factual in nature -> notes and ppt
III. Climate change -> Mains and Prelims ( Book)
Most Basic Book is 12th Biology NCERT (last 6 chapters)
Autotrophs the organism which can prepare their one food from sun
light (400nm to 700nm)
Heterotrophs the organism dependent on autotrophs for food.
When autotrophs and heterotrophs dies, they become food for
detritivores and decomposers.
Saprotrophs (Detritivores and Decomposers)
Detritivore is an organism that eats dead or decaying plants or
animals as food. Detritivores include microorganisms such as bacteria
and larger organisms such as fungi, insects, worms, and some
crustaceans.
Detritivores help to breaks complex organic matter into simple form
and after that Decomposers are organism that will further simplify
with the process of Humification and Mineralisation.
Google it:- https://ourstudycircle.in
, https://telegram.me/upsc_iassquad << Download From >> https://telegram.me/upsc_iassqua
1. Ecosystem and Ecology
❖ Levels of Organisation.
❖ Types of Ecosystem and Biomes.
❖ Eutrophication
• Levels of Organisation
BIOSPHERE
BIOMS
ECOSYSTEM
COMMUNITY
POPULATION
INDIVIDUAL
CELL
Fresh water ecosystem can be divided into Lotic (moving water) and
Lentic (stagnant water) ecosystem.
Google it:- https://ourstudycircle.in
