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Our Environment: An Introduction

Updated: Aug 5, 2023

Environment means what surrounds us. The term "Environment" refers to the surroundings in which living organisms, including humans, exist and interact with each other and their surroundings. It encompasses both the natural and built elements that shape our lives and influence our well-being.

Our Environment
Our Environment

Components of Environment

The environment is a complex and dynamic system composed of diverse elements that interact and influence one another. The environment is made up of two major components, which are Abiotic and Biotic Factors.

1. Abiotic Factors

Abiotic factors refer to the non-living components of the environment that influence the survival, distribution, and behaviour of organisms. These factors include various physical and chemical elements that interact to create diverse habitats and ecosystems.

a) Physical Factors

Physical factors are non-living elements of the environment that directly affect the living organisms within a given habitat. These factors encompass a range of characteristics, from climatic conditions to geological features, and play a fundamental role in determining the diversity and dynamics of ecosystems.

1. Atmosphere (Air)

The thin layer of gases that surrounds our planet provides us with the air we breathe and regulates the climate.

2. Hydrosphere (Water)

The vast bodies of water, such as oceans, seas, lakes, rivers, and groundwater, cover a significant portion of the Earth's surface.

3. Lithosphere (Soil)

The solid outer layer of the Earth comprises the crust and upper mantle, where geological processes shape the landscape.

4. Sunlight

The primary source of energy for all life on Earth, driving photosynthesis and supporting ecosystems.

5. Temperature:

The measure of heat or coldness in the environment influences the distribution and behaviour of organisms.

b) Chemical Factors

The environment is influenced by a variety of chemical factors that play significant roles in shaping ecosystems and affecting the well-being of living organisms. Chemical factors refer to the various substances and compounds present in the environment that can directly or indirectly influence living organisms and natural processes. They primarily consist of inorganic and Organic Substances.

Components of Environment
Components of Environment

Inorganic Substances

1. Atmospheric Gases

The atmosphere contains essential gases, such as oxygen (O2) and carbon dioxide (CO2), which are critical for the respiration of plants and animals. Additionally, trace gases like methane (CH4) and nitrous oxide (N2O) can significantly impact climate change and atmospheric chemistry.

2. Soil Nutrients

Soil is a vital component of terrestrial ecosystems, providing nutrients and support for plant growth. Essential soil nutrients include nitrogen (N), phosphorus (P), potassium (K), and various micronutrients. The availability of these nutrients directly affects plant health and productivity.

Organic Substances

Organic Substances include proteins, carbohydrates, and fats which are essential macronutrients that work as a building block and provide the energy needed for the proper functioning of living organisms.

1. Proteins

Proteins are complex molecules composed of amino acids, which are building blocks of life.

2. Carbohydrates

Carbohydrates are the primary source of energy for the body, providing glucose, which is essential for fueling cellular processes.

3. Fats

Fats, also known as lipids, are concentrated sources of energy and serve as energy reserves in the body

2. Biotic Factors

Biotic factors encompass all living organisms within an ecosystem.


Autotrophs, often referred to as "producers," are organisms capable of synthesizing their own food using sunlight and inorganic substances through the process of photosynthesis or chemosynthesis. They are the primary foundation of food chains and webs, providing nourishment to other organisms within the ecosystem. Plants, algae, and some bacteria are prominent examples of autotrophs. They convert solar energy into chemical energy, making it accessible to the entire ecosystem.


Heterotrophs, known as "consumers," are organisms that cannot produce their own food and must obtain their energy and nutrients by consuming other organisms. They rely on autotrophs and other heterotrophs for sustenance. Heterotrophs can be further classified into various categories based on their feeding habits:


Herbivores primarily consume plants and algae as their source of energy.


Carnivores are meat-eaters and prey on other animals for their energy needs.


Omnivores have a versatile diet and consume both plant and animal matter.


Scavengers feed on dead and decaying organisms, helping in the process of decomposition.


Detritivores consume organic debris and detritus, breaking them down into smaller particles.


Decomposers, also known as saprotrophs or detritivores, are organisms that play a crucial role in breaking down dead plant and animal matter into simpler substances. They obtain their nutrients by feeding on decaying organic material and, in the process, release essential elements back into the environment. Decomposers are instrumental in the recycling of nutrients, making them available for use by autotrophs and other living organisms. Common examples of decomposers include fungi and certain bacteria.

An Ecosystem is a community of living organisms, referred to as biotic components, interacting with their non-living surroundings, known as abiotic components. These interactions create a delicate balance where energy, nutrients, and materials flow through various pathways, supporting the functioning and survival of the ecosystem as a whole.

Types of Ecosystems
Types of Ecosystems

Types of Ecosystems

Ecosystems exist in various forms, each with unique characteristics and inhabitants:

1. Terrestrial Ecosystems

Terrestrial ecosystems include forests, grasslands, deserts, tundras, and more. The flora and fauna in these ecosystems have adapted to life on land, facing challenges like seasonal changes and varying precipitation levels.

2. Aquatic Ecosystems

Aquatic ecosystems encompass freshwater and marine environments. Lakes, rivers, ponds, oceans, and coral reefs are examples of aquatic ecosystems, each hosting a diverse array of aquatic organisms.

3. Human-Made Ecosystems

Human-made ecosystems, or anthropogenic ecosystems, are a result of human activities. Urban areas, agricultural lands, and managed forests are examples of human-made ecosystems that coexist with natural ecosystems.

Food chain

A food chain is a simple representation of the feeding relationships in an ecosystem, and a network of two or more than two food chains is called the food web.

A typical food chain consists of the following components:

1. Producers (eg. Grass)

2. Primary Consumers (eg. Grasshopper)

3. Secondary Consumers (eg. Frogs)

4. Tertiary Consumers (eg. Snake)

5. Decomposers (eg. Fungi/ Bacteria)

Food chain and Food Web
Food chain and Food Web

It starts with a producer, which is usually a plant or other autotrophic organism capable of producing its own food through photosynthesis or chemosynthesis. The energy from the producer is then transferred to a series of consumers, which are heterotrophic organisms that obtain their energy by consuming other organisms.


Food chains are essential for understanding the flow of energy and nutrients within ecosystems. They provide valuable insights into the structure and function of ecological communities.


Ecology is the scientific study of the relationships between living organisms and their environment. It encompasses the interactions between organisms, as well as their interactions with the physical and chemical factors of their surroundings.


Ecology plays a crucial role in understanding the natural world and the relationships between living organisms and their environment. By studying ecological principles, one can gain insights into the intricate web of life, make informed decisions on conservation, and develop sustainable practices to protect our planet's biodiversity and natural resources.

What are the biotic components?

  • elements which consist life

  • elements which suports the life

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