ecosystems

Question 1

5 different biomes

Answer 1

Tundra (north Canada), rainforest (Malaysia), savanna grassland (Kenya), desert (Egypt), Boreal or taiga (coniferous forest) (Russia) and prairie (USA).

Question 2

Pond ecosystem

Answer 2

• producers e.g. Algae
• consumers e.g. Snails, fish
• decomposers e.g. Bacteria on leaves
  Pond surface: lots of light, animals live here
  Margin: food found here e.g. Algae, Shelter for animals
  Mid water: the main predators e.g. Fish
  Bottom: the pond bottom has little oxygen, decomposers and scavengers live here.

Question 3

Natural and human changes on ecosystems

Answer 3

Natural: weather, climate change, plants dry out and die.
Human: fertilisers, drowning of ponds, hedgerows removed, agriculture

Question 4

Short and long-term affects on ecosystems

Answer 4

Short: temperature – freeze/evaporate
Long: climate change (global Warming), deforestation

Question 5

nutrient cycle

Answer 5

1) nutrients and minerals enter soil as rocks are weathered and as decomposers break down surface material.
2) Roots of plants absorb the minerals, like nitrate ions and potassium, necessary for growth from soil or water.
3) An animal like a squirrel then eats the leaves off the tree gaining the minerals and nutrients.
4) then that squirrel dies and decomposers decompose the squirrel so the nutrients go back into the soil.