Organic Compounds, Internal / External Stimulus, and Tropisms (Stimulus for plants)
Review
Organic – Carbon based organisms
Organic Food – No artificial fertilizers or pesticides on fruits and vegetables, nor hormones / antibiotics or
genetically mutated livestock. (cows, pigs, fish)
100% = All Natural
95% = USDA Organic Natural with preservatives
70% = Made with organic plus, food coloring dye, preservatives and taste enhancing
Pluses
Minuses
Good for ECO
takes more time
Rich soil
requires more workers
Balances bugs
more expensive
Less water pollution
Carbs
Carbohydrates (starches) (break down into sugars with saliva (mouth)
Sugar
break down to
Proteins break down into amino acids with HCl acid (stomach)
Organic Elements
C – Carbon
Rules to identify organic compounds:
H – Hydrogen
1. Must have more than on C₂ OR
O – Oxygen
2. C must be attached to the H = CH
N – Nitrogen
P – Phosphorus

S – Sulfur
Inorganic
Compound
H₂O
NaHCO
NaCO₂
CO₂
Organic
Name
Water
Sodium HydroCarbonate
Sodium Carbonate
Carbon Dioxide
Compound
C₆H₁₂O₆
R-CH(NH₂)-COOH
CH₂OH
C₂H₆
Name
Glucose (Sugar)
Amino Acids
Ribose
Ethane
Nitrogen Cycle – Bacteria helps return nitrates
Carbon Cycle – Carbon stored in fossil fuels, everything living is made of carbon, and natural / man – made
Phosphorus Cycle – Rock & Soil store phosphorus chemicals.
Tropism is the response to stimulus by movement:
External (Cause) Stimulus – is the change in the environment that causes you to react
Internal (Cause) Stimulus – creates a symptom for a body out of balance. Ex: Coughing, Diarrhea or Fever
Homeostasis – Body systems are stable (no symptoms)
Hydro – Response to water
Turgor Pressure (in the xylem) helps the plant stand. The vacuole applies pressure on the cell wall.
Photo – Response to light
Chemo – Response to chemicals
Thermo – Response to heat
Thigmo – Response to touch
Gravity – Response to gravity