1. Reproduction of animals

2. Why do animals reproduce?？ ？ ？ ？ ？ ？
Why do animals reproduce? ？ ？ ？ ？ ？

3. Animals die… All animals die when they get old.
Some animals die in natural disasters.
Some die when there is no food or water.
Some are killed by other animals.

4. If animals do not reproduce,
they will become…
Extinct

5. How do animals reproduce?

6. Animal Reproduction The egg of the female animal is
fertilised by the sperm of the male
animal.

7. Animals reproduce in two ways:
By laying eggs
The mothers lay the fertilised eggs and hatch them.
They lay a large number of eggs each time.

8. Which comes first? Eggs or chicks?
What is inside a chicken’s egg?
Shell
Egg white
Yolk
Embryo

9. 2. By giving birth to the young
The fertilised egg develops in the mother’s body and becomes an embryo.
The mother gives birth to the baby after a period of time. The newborn baby feeds on its mother’s milk.

10. How do these animals reproduce?

11. Which animal below lay eggs?
Which animal gives birth to its young?

12. Birds, insects and fish lay eggs.

13. Mammals give birth to their young.

14. The Chinese University of Hong Kong
Postgraduate Diploma of Education (Primary)
DEP5114A ( )
Professor Mak Se Yuen
Producer: Fong Pui Ting Karen ( )
9 April, 2001

15. The End
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