SECONDARY ONE INTEGRATED SCIENCE Unit 2 Looking at living things 2.3 Diversity of living things Dec-2010 1
Jun 27, 2015
SECONDARY ONEINTEGRATED SCIENCE
Unit 2Looking at living things
2.3 Diversity of living things
Dec-2010
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REVISION
Do you remember what did we do in the last lesson? Observation of living things
External features Behaviours
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THE WIDE VARIETY OF LIVING THINGS
How many kinds of living things can you find in this picture of showing a corner of a park?
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THE WIDE VARIETY OF LIVING THINGS
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OK!Let me count how many living things!
5…10…
There are at least 10 living things just at a corner of a park!
Oh! I can’t imagine how Oh! I can’t imagine how many kinds of living many kinds of living things in the world!things in the world!
THE WIDE VARIETY OF LIVING THINGS
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Let me tell you the answer.
Scientists estimate that Scientists estimate that there are 4 million to 12 there are 4 million to 12
million kinds of living million kinds of living things on Earth. things on Earth.
THE WIDE VARIETY OF LIVING THINGS
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WOW! However, I have a question.
Why is the total number Why is the total number of kinds of living things on of kinds of living things on
Earth only an estimate?Earth only an estimate?
THE WIDE VARIETY OF LIVING THINGS
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It is because some living It is because some living things cannot be seen things cannot be seen
directly and some of them directly and some of them live in the deep sea or live in the deep sea or hide themselves from hide themselves from human. So the exact human. So the exact
number remains unknown.number remains unknown.
THE WIDE VARIETY OF LIVING THINGS
These living things differ in:
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size
body forms body structure
THE WIDE VARIETY OF LIVING THINGS
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LIVING THINGS AND THEIR HABITATS
Natural environment where living things live
http://www.youtube.com/watch?v=zNTHVLxPP54
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Can you point out the habitats
mentioned in the video?
LIVING THINGS AND THEIR HABITATS
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BehavioursBody
features
help living things to adapt to their habitats
IN THE FOREST
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some plants climb on tree trunks
reach for more sunlight
IN THE GRASSLAND
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antelopes run fast
escape from predators
IN THE DESERT
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cacti store a lot of water
survive in dry environment
IN THE FRESHWATER STREAM
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webbed feetfrogs have webbed feet
swim in water
IN THE OCEAN
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dolphins have a streamlined body
swim with little water resistance
IN THE POLAR REGION
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seals have a thick layer
of fat under skin
keep warm in coldenvironment
WHAT ELSE?
Hong Kong Wetland Park http://www.wetlandpark.com/en/biodiversity/
hab_fm.asp
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ROLE PLAY
3 students Imagine you are a specified living thing and
follow the instructions below. Do the suitable action (e.g. move slowly/ voice) Say the special feature(s) you have Choose the most favourable habitat for you to live Explain your choice
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1. CAMEL
(A) Grassland (B) Desert (C) Polar region
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2. PENGUIN
(A) Polar region (B) Rainforest (C) River
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3. SHEEP
(A) Ocean (B) Polar region (C) Grassland
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>
RECALLING YOUR MEMORY
Worksheet of 2.2 Observing Living Things Question of finding differences between two
tortoises Answers included
Size Weight Pattern Colour Etc.
Those differences are called variations23
VARIATIONS
The differences among the individuals of the same kind of living things
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VARIATIONS Continuous
Have a range of intermediate between two extremes.
E.g. Height
Discontinuous Have no intermediates. Either have the characteristic or don’t. E.g. Blood type
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CLASSROOM ACTIVITY 2.4
Variations within humans Can you roll your tongue? Do you have free or attached earlobes? Can you bend your thumb back? Measure your hand-span in cm. Draw a bar chart to show the distribution.
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WHAT SHOULD WE LEARN FROM VARIATIONS?
Not bad or good Everyone has his/ her own characteristics Respect and accept each other
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SUMMARY
Scientist estimate (估計 ) 4 millions to 12 millions kinds of living things on Earth
They are different in size, body form and body structure
There are many habitats (生境 ) in the world where living things are living in Desert (沙漠 ) Ocean ( 海洋 ) Forest ( 森林 ) Polar region (極地 ) Etc.
Living things adapt (適應 ) the habitats by their body features and behaviours
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SUMMARY
Variations (差異 ) exist among the individuals of the same kind of living things.
Continuous variations ( 連續差異 ) Height Weight
Discontinuous variations ( 不連續差異 ) Skin colour Blood type
We should respect (尊重 ) and accept (接納 ) everyone.
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