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B3 Life on Earth

B3 Life on Earth. Lesson 11: A Sustainable Future. Objectives. MUST define sustainability SHOULD apply knowledge about biodiversity to explain why large-scale monoculture is unsustainable COULD explain how scientists have tried to minimise the impact of habitat loss. Key Words.

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B3 Life on Earth

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  1. B3 Life on Earth Lesson 11: A Sustainable Future

  2. Objectives • MUSTdefine sustainability • SHOULD apply knowledge about biodiversity to explain why large-scale monoculture is unsustainable • COULD explain how scientists have tried to minimise the impact of habitat loss

  3. Key Words • You need to be able to define the following: • Sustainability • Intensive crop production • Monoculture • Predate

  4. Textbook Answers 1) Using resources and processes to meet our needs now, without stopping future generations from using them. 2) By eating local, seasonal produce; by reducing the number of things we buy; by saving energy; etc. 3) The whole system can collapse and other species are no longer able to survive. 4) The sea otter is a good example of a species that maintains its ecosystem. It eats sea urchins; without the otters keeping the population of sea urchins down, the urchins would graze on and deplete the kelp beds; where spawning fish lay their eggs; this would lead to a decline in fish stocks.

  5. Textbook Answers 5) Reduces available habitat for many species that would otherwise live on farmland; it also uses chemical pesticides and herbicides that kill insects and weeds, which other species rely on for food. 6) They can leave strips of land fallow for weeds to grow on; this provides habitats for insects and food for birds; they can harvest crops at times that do not disrupt breeding birds; they can incorporate ‘beetle banks’ into their fields to provide insect habitats.

  6. Worksheet Answers Activity 1 (Low demand) • Food: eat seasonal produce; eat local produce; reduce air miles. • Clothes: recycle and re-use where possible; replace only if outgrown or worn out; buy fewer. • Purchases: buy only if essential; replace only if broken or worn out; recycle and repair where possible; buy second-hand. • Transport: reduce car use; use public transport; use bike or go on foot.

  7. Worksheet Answers Activity 2 (Standard demand) 1) Prairie dogs maintain grassland by fertilising and aerating the soil; the holes they make provide valuable nesting habitats for other species. 2) Tiger sharks keep the numbers of grazing turtles and dugong down; if the shark population declines, the sea-grass beds are over-grazed; these beds are where the fish lay their eggs, so this leads to limited egg-laying sites and so rapid decline in fish populations. 3) African elephants weed out and eat young trees and shrubs in the grassland; if these were allowed to grow the grassland would become wooded; herds of grazing animals such as impala would disappear; and also the carnivores such as lions that prey on them.

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