ICSE Class 9 Environmental Science — Chapter Summary

Environment is the sum total of natural and human-made conditions that surround living organisms and influence their survival, growth, and activities. Earth functions as a life-supporting system because its air, water, land, living organisms, energy flow, and nutrient cycles continuously interact. T

Life on Earth depends on connected natural processes that produce food, recycle nutrients, and keep matter moving through the environment. Photosynthesis makes food and releases oxygen, decomposition returns nutrients to the soil, adaptation helps organisms survive in different habitats, and evoluti

Biodiversity is the total variety of life and the interactions among organisms within ecosystems. It includes genetic differences within a species, the variety of different species, and the variety of ecosystems found on Earth. Biodiversity supports ecosystem stability, productivity, resilience, and