Modes of Nutrition

Learning Goal: How do organisms acquire energy to maintain the life functions?

Do Now: Brain Dump

All living things need energy to perform the life functions.

All cells need energy to perform the life (cell) functions.

Discuss with your partner & write it down: What is nutrition?

All activities by which an organism obtains food from the environment and breaks

it down to a form that can be absorbed by cells and used for energy

There are two types of nutrition:

Heterotrophic & Autotrophic

Hetero: different/others

Trophic: nutrition/feeding

The eaters: Acquires food from the environment

Most foods are made of organic molecules that contain energy

Heterotrophic Nutrition

Review: What are the three organic molecules and food sources of each?

Organic Molecule Food Source

Carbohydrates (sugars and starches) Bread/Pasta

Proteins

Lipids (fats)

Meat and nuts

Vegetable oil, butter

Which living things? Heterotrophs (Consumers)All Animals All Fungi

Some Bacteria

Some Protists(one-celled “animals”)

Ameba eating a paramecium

Auto: self (makes own)

Trophic: nutrition/feeding

Produces its own food

Produces food energy in the form of sugar (glucose) - an organic molecule

Autotrophic Nutrition

Photosynthesis light

Which living things?Autotrophs (Producers)Chemosynthesis● Bacteria at

hydrothermal vents● No sunlight

Photosynthesis

All Plants

Some Protists:

Simple Algae

Euglena

Some bacteria

Partner 1

Describe how heterotrophs acquire energy.

Give examples.

Describe how autotrophs acquire energy.

Give examples.

Partner 2

How does energy travel in an ecosystem?

Sun: Initial source of energy for ALL life

PHOTOSYNTHESIS

Autotrophs: Synthesize organic molecules Heterotrophs: Ingest organic molecules

Harnesses (captures) sun’s energy

Transforms Light energy into Chemical energy

Stored in glucose

Used to maintain life functionsUsed by heterotrophs (energy source)