By Momina Shehzadi | BS Zoology Graduate, Pakistan In this article, we will learn Fungi - Morphology, Reproduction, Physiology and Importance - in simple words with diagram. This topic is very important for BS Zoology and Microbiology students. Fungi are found everywhere around us. They are present in soil, in water, in air, on dead plants, on dead animals, on our food, on our skin and even inside our body. When bread becomes old, green or black spots appear on it. These spots are fungi. When we see mushroom growing after rain, that is also a fungus. When yeast is used to make bread soft, that is also a fungus. Fungi are very different from bacteria and plants. They are eukaryotic organisms. It means their cells have a true nucleus and other membrane bound organelles. They do not have chlorophyll, so they cannot make their own food like plants. They get their food from other living or dead things. That is why they are called heterotrophic organisms. The study of fungi is called mycolog...
By Momina Shehzadi | BS Zoology Graduate, Pakistan
In this article, we will learn about Ecosystem, its components, types, and functions in simple words. This topic is very important for BS Zoology and BSc Zoology students.
Introduction - What is an Ecosystem ?
The term Ecosystem was first coined by ecologist A.G. Tansley in 1935. In simple words, an ecosystem is a community where living organisms (biotic) interact with non-living elements (abiotic) like air, water, sunlight, and soil in a specific area.
Think of it like a web. You cannot remove one thread without affecting the whole web. A small pond, a huge desert, a forest, and even your backyard garden - all are examples of ecosystems. In 2026, understanding ecosystems is more important than ever because of climate change and pollution.
The Two Main Components of an Ecosystem
Every ecosystem, no matter how big or small, has two main components:
1. Biotic Components (Living Things)
- Producers: Green plants and algae. They make their own food using sunlight through photosynthesis. They are the base of all life.
- Consumers: Animals that depend on producers. Primary consumers (goat, deer), Secondary consumers (fox, snake), and Tertiary consumers (lion, eagle).
- Decomposers: Bacteria and fungi. They are the cleaners of the ecosystem. They break down dead plants and animals and return nutrients to the soil.
2. Abiotic Components (Non-Living Things)
These include sunlight, temperature, rainfall, humidity, soil pH, water, and air. For example, without sunlight, producers cannot make food, and the whole chain collapses.
Major Types of Ecosystem in the World
Ecosystems are broadly divided into two types:
A. Terrestrial Ecosystems (Land-Based)
1. Forest Ecosystem: They cover 31% of the land area. Tropical rainforests like the Amazon are the most biodiverse, holding more than 50% of the world's species. They are called the "Lungs of the Earth".
2. Desert Ecosystem: Receives less than 25 cm of rainfall per year. Plants and animals here have special adaptations to store water.
3. Grassland Ecosystem: Dominated by grasses. It is perfect for grazing animals and agriculture. The savannas of Africa are a famous example.
4. Tundra Ecosystem: The coldest ecosystem found in the Arctic. No trees grow here, only mosses and lichens survive.
B. Aquatic Ecosystems (Water-Based)
1. Freshwater Ecosystem :
Includes rivers, lakes, ponds, and streams. It covers only 0.8% of Earth's surface but supports 40% of fish species.
2. Marine Ecosystem:
Includes oceans, seas, and coral reefs. Oceans produce 50-70% of the oxygen we breathe. Coral reefs, although covering less than 1% of the ocean floor, are home to 25% of marine life.
What are the 4 Main Functions of Ecosystem?
1. Regulation Function: Ecosystems regulate climate, control floods, filter air and water, and prevent soil erosion.
2. Habitat Function: It provides a safe home and breeding ground for millions of species.
3. Production Function: It gives us food, raw materials for medicine, wood, and fuel.
4. Information Function: Ecosystems provide recreation, aesthetic beauty, and scientific knowledge.
The Biggest Threats to Ecosystems Today
Human activities are destroying ecosystems faster than ever before.
Deforestation:
Every year, we cut down 15 billion trees for housing societies and farming.
- Plastic and Chemical Pollution: 8 million tons of plastic enters our oceans every year, killing marine life.
- Plastic and Chemical Pollution: 8 million tons of plastic enters our oceans every year, killing marine life.
Climate change:
Rising temperatures are bleaching coral reefs and melting tundra.
Overpopulation and Urbanization:
More people means more need for land, water, and resources.
Invasive species:
When a new species is introduced, it destroys the local food chain.
How Can We Protect and Restore Ecosystems?
Protection is not difficult. Small steps can create a big impact.
1. Plant Native Trees: Plant trees that naturally belong to your area. One mature tree can absorb 22 kg of CO2 per year.
2. Say No to Single-Use Plastic: Use cloth bags, steel bottles, and avoid plastic wrappers.
3. Conserve Water: Fix leaking taps, use water wisely. Our freshwater ecosystems are drying up.
4. Support Sustainable Farming: Avoid chemical pesticides and support organic farming.
5. Create Awareness: If you have a website, write about it like this post. Teach your children why a small ant is also important for the ecosystem.
Conclusion
An ecosystem is not just a topic for a science book; it is our life. Humans cannot survive without a healthy ecosystem. From the oxygen we inhale to the food we eat, everything comes from it. The year 2026 is a critical time. If we act now by protecting forests, cleaning rivers, and reducing pollution, we can still save our planet for the next generation.
FAQs for Ecosystem
Q1: What is an Ecosystem in simple words?
Ans: An ecosystem is a community where living organisms like plants and animals interact with non-living things like air, water, sunlight and soil in a specific area. Example: A pond, a forest, a desert.
Q2: What are the 2 main components of Ecosystem?
Ans: 1) Biotic Components - Living things like producers, consumers, decomposers. 2) Abiotic Components - Non-living things like sunlight, water, soil, temperature.
Q3: What are the types of Ecosystem?
Ans: There are 2 main types: 1) Terrestrial Ecosystem - Forest, Desert, Grassland, Tundra. 2) Aquatic Ecosystem - Freshwater (river, lake) and Marine (ocean, coral reef).
Q4: Who gave the term Ecosystem and when?
Ans: The term Ecosystem was given by ecologist A.G. Tansley in 1935.
Q5: What is the difference between Ecosystem and Habitat?
Ans: Habitat is the home or place where an organism lives, like a pond is a habitat for a fish. Ecosystem is bigger than habitat. It includes the habitat + all living organisms + non-living things like water, air, and soil, and how they interact with each other.
Q6: What is a Food Chain in an Ecosystem?
Ans: A food chain shows how energy flows from one organism to another. Example: Grass → Goat → Lion. Grass is the producer, goat is the primary consumer, and lion is the secondary consumer. If one link breaks, the whole chain is affected.
Also read previous complete topic National Parks of Pakistan and their importance
Written by Momina Shehzadi from Pakistan. I made these notes for my exams.
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