1. Aim: How can we describe how living things obtain nutrition?
Do now:
What are the three types of macromolecules we eat?
Besides these three food types, what else do you think we need to eat to survive?

2. Three macromolecules we eat…
1. Carbohydrates
Sugar, bread, fruits, vegetables
2. Lipids
Fats, oils
3. Proteins
Meat, fish, eggs, nuts & beans

3. What else do we need?
1. Vitamins
2. Minerals
3. WATER!!!

4. Nutrition:
How an organism gets food
(nutrients, organic compounds) and makes it available to the cells.
Nutrients:
Are the useful portion of food:
-sugars
-amino acids
-fat
-starch
Organic Compounds = FOOD!!!!!!

5. 2 TYPES OF NUTRITION
1. Autotrophic nutrition –
Auto (self)
trophic (refers to feeding and nutrition)
“Self feeding.”
-Organisms that make their own organic compounds
ex. Photosynthesis
Chemosynthesis

6. a. Photosynthesis
Photo (light)
synthesis (creating, making)
-Light is the source of energy for the production of food.
-“Who?”
ex. Plants

7. Autotrophs:

8. b. Chemosynthesis –
Chemo (chemical)
synthesis (creating, making)
-Chemical activity is the source of energy
for the production of organic compounds.
Who?
-organisms in environments that do not
rely on the sun to make food.
ex. Deep sea organisms

9. Photosynthesis
Chemosynthesis

10. Chemosynthetic nutrition - Deep sea tube worms and
arthropod

11. So far…..
Nutrition:
Autotrophic:
a. photosynthesis
b. chemosynthesis
Autotrophs –
Organisms that can make their own food
by photosynthesis or chemosynthesis.

12. 2. Heterotrophic nutrition –
Hetero: other
trophic: (refers to feeding and nutrition)
“Fed by others.”
- Heterotrophs: Organisms that eat
organic compounds made by others.
ex. Animals or animal-like protists
called protozoa: amoeba, paramecium.
Proto (first)
zoa (animal, zoo)

13. Examples of heterotrophs
paramecium

14. More heterotrophs….

15. Obviously, a _________________ .
heterotroph!

16. Are you a heterotroph? Why?
Summary:
2 types of nutrition on Earth:
1. Autotrophic
- photosynthesis
- chemosynthesis
2. Heterotrophic

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