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science part 1 of 2

science unit 6

why do plants play an important role in succession? because they provide food and shelter for animals
What are the first organisms to colonize? Lichens-they form because of the interactions of alga+fungus
What do lichens do? lichens use photosynthesis to make and to grow and they produce acids. these acids break rock into soil
what happens at each generation of plants? more soil is created allowing other plants to grow even taller and allowing more shrubs to grow
what does the succession process look like? lichens (0-1) grass (2-4) shrubs (5-20) forest (25-100) years
what are natural disturbances? forest fires and strong winds
what are human made disturbances? cutting down forests fro agriculture and urban development
what is a result of less complex food webs? planting one type of tree
what are some ways humans use land? farming, building cities, mining and travelling
what are some ways of habitat loss? forest clear-out, wetlands are drained and meadows are paved over
what are our standard of living in Canada compared to other places very high < larger ecological footprint
what does earth biodiversity provide us with? things we need to live and enjoy life (plant- raw materials)
how many living things are there? and what are they mostly? 1.75 million species (identified) most are small organisms or invertebrates
why do invasive species have a negative impact? not a part of existing food chains, grow quickly, have no or few natural predators and they compete for the same natural resources
Created by: cog