Populations

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  • Created by: Sopha8
  • Created on: 28-12-14 15:25
What is a niche?
the role of a species within its habitat including its biotic interactions (what it eats) and abiotic interactions (time of day its active)
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How does the process of natural selection occur?
Individuals within a species have adaptations that increases their chance for survival so more likely to reproduce and pass on alleles for their adaptation, making it more common in the population
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Give the definitions for population and community
A population is the individuals of the same species in a given area whilst a community is populations of different species in a habitat
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Explain what causes variations in population size
abiotic factors: when ideal for species they can grow and reproduce successfully, biotic factors:1) interspecific (different) and intraspecific (same) competition 2) predation- pop sizes are interlinked
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Explain the 3 types of survival curves
1-high survival of young, die in old age. 2- constant death rate throughout life span (some surive to old age). 3- most die at young age
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:
1-birth and death fluctuate at high level not much growth, 2-death falls birth same pop increase rapidly, 3-birth decreases death too much slower so pop increase at slower rate 4-fluctuate at low level pop stable but high 5-birth fall so pop decrease
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Card 2

Front

How does the process of natural selection occur?

Back

Individuals within a species have adaptations that increases their chance for survival so more likely to reproduce and pass on alleles for their adaptation, making it more common in the population

Card 3

Front

Give the definitions for population and community

Back

Preview of the front of card 3

Card 4

Front

Explain what causes variations in population size

Back

Preview of the front of card 4

Card 5

Front

Explain the 3 types of survival curves

Back

Preview of the front of card 5
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