ENVIRONMENT GEOGRAPHY TERMS-1

PRERNA FOR IAS

         Mehnat Aapki, Guidance Humari

         Roz ki Prelims Practice — Experts ke Saath

ENVIRONMENT GEOGRAPHY TERMS-1

1. Ecosystem

An ecosystem is a functional unit of nature where living organisms interact with one another and with their physical environment. It consists of biotic components (plants, animals, microorganisms) and abiotic components (air, water, soil, sunlight, and climate). Energy flows through the ecosystem from producers to consumers and decomposers, while nutrients are continuously recycled. Ecosystems may be natural, such as forests, deserts, rivers, and oceans, or artificial, such as crop fields and aquariums. A healthy ecosystem maintains ecological balance, supports biodiversity, regulates climate, and provides essential services like food, water, oxygen, and habitat for living organisms.

2. Biosphere

The biosphere is the global zone of Earth where life exists. It includes all living organisms and the parts of the atmosphere, hydrosphere, and lithosphere that support life. The biosphere extends from the deepest oceans to the lower atmosphere where organisms can survive. It contains millions of ecosystems connected through the exchange of energy and nutrients. The biosphere plays a crucial role in maintaining ecological balance, regulating climate, and supporting biodiversity. Human activities such as pollution, deforestation, and climate change threaten the biosphere, making conservation essential for sustaining life on Earth and protecting future generations.

3. Biome

A biome is a large ecological region characterized by a specific climate, vegetation, and animal life. Biomes are determined mainly by temperature, rainfall, and geographical location. Major terrestrial biomes include tropical rainforests, deserts, grasslands, tundra, taiga, and temperate forests. Each biome supports unique plant and animal species adapted to local environmental conditions. Aquatic biomes include freshwater and marine ecosystems. Biomes help scientists understand global biodiversity and ecosystem functioning. Climate change and human activities are altering many biomes, affecting wildlife habitats and ecological balance. Conserving biomes is essential for preserving biodiversity and maintaining Earth's environmental stability.

4. Habitat

A habitat is the natural home or environment where an organism lives, grows, reproduces, and obtains food and shelter. Every habitat provides the basic necessities required for survival, including water, food, suitable climate, and protection from predators. Habitats may be terrestrial, such as forests, deserts, mountains, and grasslands, or aquatic, such as rivers, lakes, wetlands, and oceans. Different species have different habitat requirements depending on their adaptations. Habitat destruction caused by deforestation, pollution, urbanization, and climate change is one of the leading causes of biodiversity loss. Habitat conservation is essential for protecting wildlife and ecosystems.

5. Niche

An ecological niche refers to the functional role and position of a species within an ecosystem. It describes how an organism obtains food, interacts with other organisms, reproduces, and responds to environmental conditions. Two species cannot occupy exactly the same niche for a long time because of competition, a concept known as the Competitive Exclusion Principle. Every species has a unique niche that contributes to ecosystem stability. Changes in environmental conditions may alter a species' niche, affecting biodiversity and ecosystem functioning. Understanding ecological niches helps scientists conserve species and maintain healthy ecological communities.

6. Biodiversity