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Standard 2
Transfer of Energy in an Ecosystem
Objective 1: Compare ways that plants and animals obtain and use energy.
a) Recognize the importance of photosynthesis in using light energy as part of
the chemical process that builds plant materials.
b) Explain how respiration in animals is a process that converts food energy
into mechanical and heat energy.
c) Trace the path of energy from the sun to mechanical energy in an organism
(e.g., sunlight - light energy to plants by photosynthesis to sugars - stored
chemical energy to respiration in muscle cell - usable chemical energy to
muscle contraction- mechanical energy).
2:1 Photosynthesis
http://youtu.be/C1_uez5WX1o
https://youtu.be/eJQxHoqIPIM
2:1 Where does the mass of the tree come
from?
http://youtu.be/2KZb2_vcNTg
Explain how a tree gets its mass.
2:1 Respiration
Respiration is the conversion of glucose into
energy.
PLANTS and ANIMALS do cellular respiration.
2:1 Energy Path
Sun gives off light energy, which plants use to create stored chemical
energy, animal eats the plant and converts it into a chemical energy that can
be used in muscles creating mechanical and heat energy as the muscle
moves.
2:1 Transfer of energy through and
ecosystem
Each time energy transfers to another organism
only 10% is transferred, 90% is converted to
heat and motion.
2:1 Quiz
1. Why is photosynthesis important to the food
chain?
2. Why is photosynthesis important for life?
3. Why don’t we have 100% energy transfer
through a food chain?
4. Why are food webs more accurate than food
chains?