Populations
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POPULATIONS. Population size. A population is the number of a species living in a particular area. Competition Predation Migration Disease Natural disasters War. For food, water and space Predators will eat prey and reduce the population (including the number of offspring)

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Population size l.jpg
Population size

  • A population is the number of a species living in a particular area


What factors could change a population l.jpg

Competition

Predation

Migration

Disease

Natural disasters

War

For food, water and space

Predators will eat prey and reduce the population (including the number of offspring)

Members of the population may leave the area

A disease could kill some of the population

Drought, fire, floods, volcanic eruptions etc could alter the habitat and affect the population

Wars can result in the death of many members of a population

What factors could change a population?


What else can affect the numbers and the distribution of a population l.jpg
What else can affect the numbers and the distribution of a population?

  • How well are individuals adapted?

  • This will affect their survival in a habitat.

  • What else lives there? This may mean competition for food.

  • There may be predators.


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Adaptation population?


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What is adaptation? population?

  • Adaptation describes how a plant of animal is able to survive in various environments

  • Well adapted organisms can cope with the different aspects of their environment, for example, the temperature


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ANIMALS STRUGGLE : population?

For food

For water

For protection against weather

Against being eaten by predators

Against disease

Against accidents

PLANTS STRUGGLE:

For water

For light

For minerals in the soil

Against weather

Against disease

Against being eaten

It is always a struggle for plants and animals to survive


How does adaptation help organisms l.jpg
How does adaptation help organisms? population?

  • Well adapted organisms are better at coping with extremes of weather

  • They are better at competing for food

  • They are better at escaping from predators

  • They are more likely to survive in their habitat and produce offspring


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An arctic habitat population?

  • This sort of habitat can have extremely low temperatures

  • The ground is covered with white snow for most of the year


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How are animals adapted to survive in the Arctic? population?

  • Animals like polar bears will have a thick insulating coat

  • They usually have a large amount of body fat

  • They have a large body size to surface area ratio

  • They have a camouflaged coat


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A thick fur coat population?

Large body size to surface area ratio

A large amount of body fat

Camouflage

Traps heat to keep warm

Reduces heat loss by radiation

Acts as a food store and to keep warm

White fur is good camouflage to hide from prey

How do these adaptations help?


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A desert environment population?

  • A desert can have very little rainfall

  • There is a lot of sunshine during the day

  • There is very little shade

  • The temperatures can get very hot

  • At night it can become very cold


How is a camel adapted to survive in the desert l.jpg
How is a camel adapted to survive in the desert? population?

  • Camels can store large amounts of water in the fat in their humps

  • They have feet with a large surface area to allow them to walk on sand

  • They also have long eye-lashes to stop sand blowing into their eyes


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How do reptiles survive in the desert? population?

  • Most reptiles will find some shade under a rock during the hottest part of the day

  • When walking on hot sand a lizard will try to touch the ground with only a small area

  • This lizard keeps swopping feet, and only stands on two feet at a time

  • This snake keeps a loop of itself off the ground as it moves across the sand sideways


How do plants survive the desert l.jpg
How do plants survive the desert? population?

  • A cactus has a long tap root to reach water deep under the ground

  • It has a thick, fleshy stem to store water

  • It has needle-shaped leaves to prevent water loss through the stomata

  • The needles help to stop animals from eating it


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This powerpoint was kindly donated to population?www.worldofteaching.com

http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.


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This powerpoint was kindly donated to population?www.worldofteaching.com

http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.


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