Class 3 - GK - Dinosaurs: The Giant Reptiles

Learning Objectives

Students will learn what dinosaurs were and when they lived.
Students will know about different types of dinosaurs.
Students will understand what fossils are and how we know about dinosaurs.
Students will learn why dinosaurs became extinct.

Let Us Begin!

Millions of years ago, long before humans existed, giant creatures called dinosaurs roamed the Earth. Some were as tall as a five-storey building! Some ate plants, some ate meat, and some could even fly. The word "dinosaur" means "terrible lizard" in Greek. Dinosaurs lived on Earth for about 165 million years -- much longer than humans have been around!

When Did Dinosaurs Live?

Dinosaurs lived during a time called the Mesozoic Era, which is divided into three periods:

Period	When	What Happened
Triassic	252-201 million years ago	First dinosaurs appeared. They were small.
Jurassic	201-145 million years ago	Dinosaurs grew very large. Many new types appeared.
Cretaceous	145-66 million years ago	Dinosaurs were everywhere. Then they went extinct.

Think about it -- dinosaurs lived for 165 million years. Humans have been around for only about 300,000 years!

Famous Dinosaurs

Dinosaur	Type	Size	Interesting Fact
Tyrannosaurus Rex (T-Rex)	Meat-eater	12 metres long	Had tiny arms but huge jaws with 60 sharp teeth!
Brachiosaurus	Plant-eater	26 metres long	One of the tallest dinosaurs. Its neck was as long as a giraffe!
Triceratops	Plant-eater	9 metres long	Had three horns on its head and a large bony frill.
Velociraptor	Meat-eater	2 metres long	Small but very fast and smart. Hunted in groups.
Stegosaurus	Plant-eater	9 metres long	Had large bony plates on its back and spikes on its tail.
Pteranodon	Meat-eater (fish)	7 metre wingspan	Not a dinosaur but a flying reptile! Lived alongside dinosaurs.

Key Words and Meanings

Word	Meaning
Dinosaur	A group of reptiles that lived millions of years ago (means "terrible lizard")
Fossil	The remains or impression of a plant or animal preserved in rock
Extinct	When all members of a species have died and none are left
Herbivore	An animal that eats only plants
Carnivore	An animal that eats only meat
Palaeontologist	A scientist who studies fossils and ancient life

Dinosaurs in India!

Did you know that dinosaur fossils have been found in India too? In Gujarat (Balasinor), scientists found fossils of a dinosaur called Rajasaurus -- meaning "King Lizard." Fossils have also been found in Madhya Pradesh, Maharashtra, and Tamil Nadu. India was once home to many dinosaurs!

Why Did Dinosaurs Become Extinct?

About 66 million years ago, all dinosaurs (except birds) suddenly disappeared. Scientists believe a giant asteroid (a huge rock from space) hit the Earth near Mexico. This caused:

Huge fires and dust clouds that blocked sunlight for months.
Plants died because there was no sunlight.
Plant-eating dinosaurs starved, then meat-eating dinosaurs had no food.
The Earth became very cold.

But not all life ended! Small animals, birds, and sea creatures survived. In fact, scientists believe that today's birds are descendants of dinosaurs!

Key Points to Remember

Dinosaurs lived millions of years ago, long before humans.
Some were herbivores (plant-eaters), some were carnivores (meat-eaters).
We know about dinosaurs from fossils found in rocks.
Dinosaur fossils have been found in India (Gujarat, MP, Maharashtra).
Dinosaurs became extinct about 66 million years ago, likely due to an asteroid.
Today's birds are believed to be descendants of dinosaurs.

Practice Questions

A. Fill in the Blanks:

The word dinosaur means "."
T-Rex was a -eater (meat/plant).
We learn about dinosaurs from found in rocks.
Dinosaurs became extinct about million years ago.
In India, fossils were found in Gujarat.

B. Multiple Choice Questions:

Which dinosaur had three horns?
(a) T-Rex(b) Triceratops(c) Stegosaurus(d) Velociraptor
What likely caused dinosaur extinction?
(a) Flood(b) Earthquake(c) Asteroid(d) Volcano only
Brachiosaurus was a:
(a) Meat-eater(b) Plant-eater(c) Fish-eater

C. Write "Herbivore" or "Carnivore":

T-Rex --
Brachiosaurus --
Triceratops --
Velociraptor --

D. Short Answer Questions:

What is a fossil?
Name two dinosaurs and one fact about each.

Think and Do -- Fun Activity

My Favourite Dinosaur: Draw your favourite dinosaur. Write its name, whether it ate plants or meat, and one interesting fact about it.

Fossil Hunt: Go to your garden or a park. Look for interesting stones or shapes in rocks. Can you find anything that looks like it could be a fossil? Draw what you find.

General Knowledge -- Class 3

General Knowledge -- Class 3 (continued)