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Energy Flow, Photosynthesis, Cellular Respiration
Transcript of Energy Flow, Photosynthesis, Cellular Respiration
Energy Flow in Ecosystems
All organisms need energy to survive
energy that travels through empty space
. It is the
source of almost all energy on Earth.
produced by the sun
70% of the radiant energy hitting Earth is absorbed by the hydrosphere and lithosphere. It is then converted to thermal energy.
From all of the thermal energy produced from the hydrosphere and lithosphere from absorbing the radiant energy from the sun, only 0.023% is directly absorbed by organisms through photosynthesis and then turned into chemical energy.
The process by which the sun energy is turned into chemical energy
Carbon dioxide + Water Sugar + Oxygen
What is cellular respiration?
The process by which sugar and oxygen are converted to carbon dioxide and water to provide energy for the cell
Sugar + Oxygen Carbon Dioxide + water + ENERGY
Since there is no sun at night... what do plants do?
Plants also perform cellular respiration. Usually at night time when there is no sun. Photosynthesis occurs during the day
2 types of Radiant Energy:
Invisible (Ultraviolet Light)
Visible (Light you see from the sun)
The other 30% is reflected back into space.
is energy that is
transferred during heating or cooling.
warms the atmosphere, evaporates water and produces winds.
cannot provide organisms with energy to function
stored in cells and released when needed
. Chemical energy makes the
organism performs functions such as movement, growth, reproduction.
It must be
replaced as used.
Many organisms can convert light energy into chemical energy through photosynthesis. They make their own food and are called producers
Plants use light energy to convert low energy compounds into high energy compounds
All chemical energy in food was once light energy captured in photosynthesis
Plants are green because they have a green chemical called chlorophyll which captures light energy
Why are plants green?
Sugar is stored as chemical energy in roots, stems, leaves and seeds. It often is converted by the plant to starch. Oxygen is released into the environment
-How energy that is being stored is made available to for use.
-Releases energy that can be used by the cell
An OPPOSITE reaction to photosynthesis
+ ENERGY (from sun)
Most organisms cannot photosynthesize and have to rely on getting their energy from consuming other organisms. They are called consumers.
Cellular Respiration is always happening. No light energy is required.