Ks4 competition (boardworks)
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Ks4 competition (boardworks) Presentation Transcript

  • 1. KS4 Biology Competition 1 of 24 © Boardworks Ltd 2004
  • 2. Contents Competition What is competition? Competition between animals Competition in plants Predator–prey relationships Multiple-choice quiz 2 of 24 © Boardworks Ltd 2004
  • 3. What is a population? What is the difference between a population and a community? A population is the number of individuals of the same species living in a certain habitat. A community includes all the different species living in a certain area. The size of the population within a community can change over time. What factors will affect population size? competition disease predators migration 3 of 24 © Boardworks Ltd 2004
  • 4. What is competition? Competition is one of the factors that affects population sizes. What type of organisms compete for resources? Competition occurs between different species… 4 of 24 © Boardworks Ltd 2004
  • 5. What is competition? Members of the same species also compete for resources. Why do living things need to compete and what do they compete for? 5 of 24 © Boardworks Ltd 2004
  • 6. Contents Competition What is competition? Competition between animals Competition in plants Predator–prey relationships Multiple-choice quiz 6 of 24 © Boardworks Ltd 2004
  • 7. What do animals compete for? What four things do animals in the same species or animals of different species have to compete for? food water space mates 7 of 24 © Boardworks Ltd 2004
  • 8. Niche competition A niche is the position that a living thing occupies in a community. It is a specialized type lifestyle. What happens if animals have overlapping niches? Animals with overlapping niches compete. The more the niches overlap, the greater the amount of competition between the species. What will happen if species compete for all aspects of their niches? 8 of 24 © Boardworks Ltd 2004
  • 9. Competition losers If species compete for all aspects of their niches, eventually, one species will better the other. Competition results in winners and losers. What three things might happen to the less competitive species?  move to another area  adopt new survival strategies  become extinct in that area. 9 of 24 © Boardworks Ltd 2004
  • 10. Contents Competition What is competition? Competition between animals Competition in plants Predator–prey relationships Multiple-choice quiz 10 of 24 © Boardworks Ltd 2004
  • 11. What do plants compete for? Plants also have to compete for resources. What four things do plants in the same species or plants of different species compete for? light minerals water space 11 of 24 © Boardworks Ltd 2004
  • 12. Competition in the meadow – activity 12 of 24 © Boardworks Ltd 2004
  • 13. Contents Competition What is competition? Competition between animals Competition in plants Predator–prey relationships Multiple-choice quiz 13 of 24 © Boardworks Ltd 2004
  • 14. Animals that eat other animals Populations of animals are often limited by the amount of food. What are animals that eat other animals called? predators What are the animals that predators eat called? prey 14 of 24 © Boardworks Ltd 2004
  • 15. Predator and prey adaptations How are predators and prey adapted to survive? Predators are adapted to catching and consuming their prey. predators Prey have adaptations to detect and flee from predators. prey 15 of 24 © Boardworks Ltd 2004
  • 16. Prey adaptations – the snowshoe hare The snowshoe hare lives in northern parts of North America. How is it adapted to the cold and to avoid being eaten by predators, such as lynxes? Coat changes colour with the seasons from greyish-brown in summer to white in midwinter. Large ears help to detect predators. Strong teeth are able to chew bark and twigs. Large back feet spread out to act as snow shoes. Fur on the soles also protects from the cold. 16 of 24 © Boardworks Ltd 2004
  • 17. Predator adaptations – the lynx Lynxes are adapted to life in a cold climate. How are these predators adapted for catching the snowshoe hares that are their main prey? Excellent eyesight and hearing for detecting prey. Very sharp teeth – prey watch out! Thick furry coat protects from the cold. Very strong hind leg muscles are capable of a pounce 6.5 metres long! Extra large paws act as snow shoes on soft, deep snow. 17 of 24 © Boardworks Ltd 2004
  • 18. Predator–prey graph estimated population size (thousands) This population data comes from fur trapping records. How are the populations linked? snowshoe 150 hare lynx 100 18 of 24 50 0 1800 1820 1840 year 1860 1880 1900 © Boardworks Ltd 2004
  • 19. Predator–prey graph estimated population size (thousands) How does the lynx population depend on the number of snowshoe hares? snowshoe 150 Take a closer hare look at this part lynx of the graph. 100 19 of 24 50 0 1800 1820 1840 1860 time (year) 1880 1900 © Boardworks Ltd 2004
  • 20. Predator–prey graph section Why does the peak for the lynx population always come after the peak for the number of snowshoe hares? snowshoe hare lynx estimated population size (thousands) 150 100 20 of 24 For the populations to survive, there will always be more hares than lynxes. 50 0 1850 1855 time (year) 1860 1865 © Boardworks Ltd 2004
  • 21. Predator–prey cycle Predator and prey population sizes follow a cycle. What happens if the prey population increases? normal prey population prey population prey population increases increases predator population decreases as less food 21 of 24 prey population decreases because of more predators predator population increases as more food © Boardworks Ltd 2004
  • 22. Predator–prey cycle Predator and prey population sizes follow a cycle. What happens if the prey population decreases? normal prey population prey population prey population decreases increases predator population decreases as less food 22 of 24 prey population increases because of less predators predator population increases as more food © Boardworks Ltd 2004
  • 23. Contents Competition What is competition? Competition between animals Competition in plants Predator–prey relationships Multiple-choice quiz 23 of 24 © Boardworks Ltd 2004
  • 24. Multiple-choice quiz 24 of 24 © Boardworks Ltd 2004