Sexual Reproduction: Meiosis Chapt. 9. Plants too…Reproduce Sexually.
Reproduction of animals Why do animals reproduce?
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Transcript of Reproduction of animals Why do animals reproduce?
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Reproduction of Reproduction of animalsanimals
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Why do animals Why do animals reproduce?reproduce?
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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.
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If animals do not reproduce,
• they will become…
Extinct
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How do animals How do animals reproduce?reproduce?
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Animal ReproductionAnimal Reproduction
The egg of the female animal isfertilised by the sperm of the male animal.
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Animals reproduce in two Animals reproduce in two ways:ways:
1.By laying eggsThe mothers lay the fertilised eggs and hatch them.
They lay a large number of eggs each time.
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Which comes first? Which comes first? Eggs or chicks?Eggs or chicks?
What is inside a What is inside a chicken’s egg?chicken’s egg?
•Shell•Egg white•Yolk•Embryo
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•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.
2. By giving birth to the you2. By giving birth to the youngng
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How do these How do these animals animals
reproduce?reproduce?
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Which animal gives birth Which animal gives birth to its young?to its young?
Which animal below Which animal below lay eggs?lay eggs?
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Birds, insects and fishBirds, insects and fish lay eggs.lay eggs.
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MammalsMammals give birth to their y give birth to their young.oung.
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The Chinese University of Hong The Chinese University of Hong KongKong
Producer:Producer: Fong Pui Ting KarenFong Pui Ting Karen (99236240)(99236240)
Postgraduate Diploma of Education (Primary)Postgraduate Diploma of Education (Primary)
DEP5114A (2000-2001)DEP5114A (2000-2001)
Professor Mak Se YuenProfessor Mak Se Yuen
9 April, 20019 April, 2001
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The EndThe End
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