1.3 Variation in population size

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Why do populations not grow indefinitely?
Limiting factors e.g. food availability, disease.
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What's the difference between abiotic and biotic factors?
Biotic factors are to do with the living, abiotic is the non-living factors.
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Why does temp limit populations of warm-blooded animals?
They need to use more energy on homeostasis, and less on growth.
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How does temp affect cold blooded organisms population size?
Higher temp denature enzymes, lower temp limit enzymes' speed.
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What is the normal pattern for population growth?
Slow growth, rapid growth, plateau with small fluctuations
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Why does population growth increase exponentially?
As the population increases, there are more organisms to reproduce, therefore population grows at a faster rate.
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Why would a decrease in light cause a decrease in animals?
Without light photosynthesis cannot occur, so plants would die without glucose production. Then there would be no food for the animals and they would die.
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Does increased humidity cause increased or decreased transpiration?
Decrease.
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What abiotic factors affect population size?
Light, temperature, pH, water or humidity, nutrient levels.
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Example of a biotic factor?
Intraspecific competition, predation.
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Card 2

Front

What's the difference between abiotic and biotic factors?

Back

Biotic factors are to do with the living, abiotic is the non-living factors.

Card 3

Front

Why does temp limit populations of warm-blooded animals?

Back

Preview of the front of card 3

Card 4

Front

How does temp affect cold blooded organisms population size?

Back

Preview of the front of card 4

Card 5

Front

What is the normal pattern for population growth?

Back

Preview of the front of card 5
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