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Leaving certificate biology

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  1. Unit 1
    Ecology theory
    5 Topics
    1 Quiz
  2. Nutrient recycling
    4 Topics
    1 Quiz
  3. Ecological relationships and population dynamics
    2 Topics
  4. Human impact on the ecosystem
    2 Topics
  5. Study of a grassland ecosystem
    3 Topics
  6. Responses in the Flowering Plant
    4 Topics
    1 Quiz
  7. Unit 3
    Sexual reproduction in the flowering plant
    1 Topic
  8. The human reproductive system
    3 Topics
  9. The menstrual cycle
    2 Topics
  10. Pregnancy
    2 Topics
  11. The circulatory system
    4 Topics
  12. Blood
    5 Topics
  13. The heart
    5 Topics
Lesson 4, Topic 2
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Conservation and wastemanagment

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What is conservation ?

 Conservation is the wise management of our existing natural resources in order to allow as many species   as possible to survive 

What are the benefits of conservation?

  • Maintains our food supply
  • Maintains biodiversity and possible sources of drugs
  • Promotes recreation and tourism

An example of conservation in practice


  • Different species of trees are planted 
  • Tree felling is regulated

Why is it important to manage waste ?

  • Waste management is needed to reduce pollution as much as possible

Ways in which waste is disposed?

  • Stored in landfill sites
  • Recycled
  • Destroyed in incinerators

Waste disposal issues

  • Shortage of landfill sites to take all the waste
  • Landfill sights are unsightly , smell and pollutes local water supplies
  • Harmful gases are released when waste is incinerated

An example of waste management

  • In forestry, large tree branches are used to make sawdust and MDF
  • Smaller branches are left to decay for recycling nutrients

The role of micro-organisms in waste management ad pollution control

Bacteria and fungi are major decomposes in the following areas:

  • Sewage treatment plants
  • Compost heaps
  • Digesters
  • Landfill sites
  • Soil contaminated with pesticides and chemicals from industry

Waste minimisation

  • Reuse
  • Recycle
  • Reduce