The whole chapter in one shot
Parth Momaya · YouTube
Ecosystem, pollution, biodiversity, hotspots and conservation covered end to end in a single sitting.
Environmental Management
Chapter 4 of Science and Technology Part 2, SSC Std 10 (English Medium). A short revision read — free, no sign-up.
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Hand-picked free resources for this exact chapter.
Taught slowly, from lecture one
JR Tutorials · YouTube
Starts at the ecosystem and builds up, which helps if the food web and trophic levels have not clicked yet.
Every exercise question solved
we & science! · YouTube
The textbook exercise at the end of the chapter, worked through question by question.