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What is Extinct Species (biology)?
Grade Level:
Class 8
Space Technology, EVs, Climate Change, Biotechnology, HealthTech, Robotics, Chemistry, Physics
Definition
What is it?
An extinct species is a type of plant or animal that no longer exists anywhere on Earth. This means there are no living individuals of that species left, and it will never be seen again.
Simple Example
Quick Example
Imagine your school used to have a specific type of old, rare tree in its garden, but due to construction, all those trees were cut down, and no new ones were planted anywhere else. If that particular tree species existed only in your school and now there are none left, it would be considered extinct, just like an old mobile phone model that's no longer manufactured or sold anywhere.
Worked Example
Step-by-Step
Let's understand how a species becomes extinct with a simplified scenario:
STEP 1: Imagine a small island with 100 unique 'Sparkle Birds'. These birds only eat a special 'Glow Berry' plant.
---STEP 2: A new factory is built on the island, and its waste pollutes the soil where Glow Berries grow. Slowly, the Glow Berry plants start dying.
---STEP 3: As Glow Berries disappear, the Sparkle Birds lose their food source. Their numbers drop from 100 to 50, then to 20.
---STEP 4: Despite efforts, the pollution continues, and the last few Glow Berry plants vanish. With no food, the remaining Sparkle Birds starve.
---STEP 5: Eventually, the last Sparkle Bird dies. No more Sparkle Birds are left on Earth.
---ANSWER: The Sparkle Bird species is now extinct because all its members have died out, and it will never return.
Why It Matters
Understanding extinct species helps us protect currently endangered animals and plants, which is crucial for maintaining Earth's biodiversity. This knowledge is vital for careers in wildlife conservation, environmental science, and even in fields like biotechnology to potentially bring back lost species, or space technology to find suitable environments for life.
Common Mistakes
MISTAKE: Thinking an extinct species might still exist in a hidden jungle. | CORRECTION: For a species to be declared extinct, scientists confirm there are no living individuals anywhere, after extensive searches.
MISTAKE: Confusing 'extinct' with 'endangered'. | CORRECTION: An 'endangered' species is at high risk of extinction but still has living members. An 'extinct' species has no living members left.
MISTAKE: Believing extinction only happens to large animals. | CORRECTION: Extinction can affect any living organism, from tiny insects and plants to large mammals, birds, and fish.
Practice Questions
Try It Yourself
QUESTION: The Dodo bird, once found on Mauritius, no longer exists. Is it an endangered species or an extinct species? | ANSWER: Extinct species
QUESTION: If a species of fish in the Ganga river has very few members left due to pollution and its numbers are still decreasing rapidly, what term best describes its current state? | ANSWER: Endangered
QUESTION: A small plant species was only found in a particular valley. A massive landslide destroyed the entire valley, and scientists confirm no plant samples survived elsewhere. Explain why this plant is now considered extinct. | ANSWER: The plant is considered extinct because its entire habitat was destroyed, and all its members, being restricted to that single location, were wiped out, leaving no living individuals anywhere on Earth.
MCQ
Quick Quiz
Which of the following best describes an extinct species?
A species that is very rare and hard to find.
A species that has no living members left on Earth.
A species that lives only in zoos and not in the wild.
A species that migrates to different continents.
The Correct Answer Is:
B
An extinct species means that every single individual of that species has died out, and it no longer exists anywhere. Options A, C, and D describe species that are still alive in some form.
Real World Connection
In the Real World
In India, the Cheetah was declared extinct in 1952. However, efforts are now being made by the Indian government to reintroduce African Cheetahs into reserves like Kuno National Park to bring the species back to India, though they are a different subspecies. This shows how understanding past extinctions drives current conservation efforts.
Key Vocabulary
Key Terms
EXTINCTION: The complete disappearance of a species from Earth | ENDANGERED: A species at high risk of extinction | BIODIVERSITY: The variety of life on Earth, including all plants, animals, fungi, and microorganisms | HABITAT: The natural environment where an organism lives
What's Next
What to Learn Next
Next, you can explore 'Endangered Species' to understand how we identify and protect animals and plants that are currently at risk. This will help you see the important connection between past extinctions and current conservation efforts.
