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INTERACTIONS IN ECOSYSTEMS“The Circle of Life”
Recall… The Lion King
PHOTOSYNTHESIS
• A process that occurs in the cells of plants, algae and some bacteria• Converts light energy from the Sun
into stored chemical energy• Uses carbon dioxide, water and light
to make oxygen and sugar
PHOTOSYNTHESIS
WHY IS IT IMPORTANT?
• Photosynthesis transforms the Sun’s energy into a form that living things can use to survive• Photosynthesis produces the oxygen
that most living things need to survive
CELLULAR RESPIRATION
• A process that occurs in the cells of most organisms• Converts the energy stored in
chemical compounds into usable energy• Uses oxygen and sugar to produce
water and carbon dioxide
CELLULAR RESPIRATION
WHY IT IS IMPORTANT?
• Cellular respiration releases the energy that living things use to survive
• Cellular respiration produces the carbon dioxide that green plant need to carry out photosynthesis
COMPLEMENTARY PROCESSES
PHOTOSYNTHESIS
• Producers use carbon dioxide to make sugars• Plants give off
oxygen gas into their surroundings
CELLULAR RESPIRATION
• Organisms give off carbon dioxide gas into their surroundings• Organisms give off
water into their surroundings
COMPLEMENTARY PROCESSES
OTHER INTERACTIONS
• Matter is recycled through ecosystems• Matter is transformed many times and used
over and over again• Three other types of cycles are:• The Water Cycle• The Carbon Cycle• The Nitrogen Cycle
THE WATER CYCLE
• The series of processes that moves water through the environment• Liquid water evaporates and changes to water
vapor• Water vapor condenses and forms water droplets• Water droplets form clouds and fall to Earth as
rain• Water enter enters lakes, oceans and the soil to
continue the process
THE WATER CYCLE
THE CARBON CYCLE
• The series of processes that moves carbon compounds throughout the environment• Most of our carbon is cycled through
photosynthesis and cellular respiration• A lot of carbon is stored in coal,
limestone, oil and natural gases
THE CARBON CYCLE
THE CARBON CYCLE
• Burning fossil fuels (coal, oil and natural gases) releases carbon dioxide and carbon monoxide into the atmosphere• Clearing forests also causes the release of
carbon trapped in trees• All this extra carbon dioxide and carbon
monoxide causes trapped energy which causes global warming
NITROGEN CYCLE
• Nitrogen is a major part of all cells and a key building block for proteins• Our air is 78% Nitrogen • Nitrogen fixing bacteria are
responsible for turning nitrogen in the air into usable forms of Nitrogen
THE NITROGEN CYCLE
THE NITROGEN CYCLE
• Nitrogen in a key component of fertilizers• Rain will carry nitrogen from farms,
gardens etc. into aquatic ecosystems• Excess nitrogen can cause an overgrowth
of algae which can damage aquatic ecosystems• Called Algal Bloom