WELCOME!

WHAT IS LIFE?

Section 1

THE CHARACTERISTICS OF LIVING THINGS

1. Cellular Organization

2. The Chemicals of Life

3. Energy Use

4. Response to Surroundings

5. Growth and Development

6. Reproduction

1. CELLULAR ORGANIZATION

• What are cells?

A cell is the basic unit of structure and function in an organism

• Organisms composed of only 1 cell

• Ex: BacteriasUnicellular

• Organisms composed of many cells

• Ex: Humans, plants etc.

Multicellular

2. THE CHEMICALS OF LIFE

• The cells of all living things are composed of chemicals

Che

mic

als

in c

ells

Water Most abundant chemical

Carbohydrates Energy Source

Lipids and Proteins

Building Material

Nucleic acids Genetic Material

3. ENERGY USE• The cells of organisms use energy to do what living things

must do

Examples:

When reading Eye and brain cells are working

When healing injuries Blood cells work

4. RESPONSE TO SURROUNDINGS

• All organisms react to changes in their environment

Stimulus: A

change in an

organisms

surroundings

Response: An

action or change

in behaviorUnk

nown

person

Dog bark

sEXAMPLE

5. GROWTH AND DEVELOPMENT

All living things grow and develop

• Growth: the process of becoming larger.

• Development: The process of change that occurs during an

organisms life to produce a more complex organism.

6. REPRODUCTION• All organisms are able to reproduce or produce offspring that

are similar to the parents

• Offspring: Descendants of a person, animal, plant etc.

Examples:

CATS KITTENS

HUMANS BABIES

PLANTS SEEDS

LIFE COMES FROM LIFELIVING THINGS ARISE FROM LIVING THINGS THROUGH REPRODUCTION

• Many years ago people believed that life could appear from nonliving material (Spontaneous Generation)

FRANCESCO REDIRedi tried to prove spontaneous generation belief was wrong

NEXT

REDI’S CONTROLLED EXPERIMENT

LOUIS PASTEUR

With his experiments people finally accepted that spontaneous generation is wrong

PASTEUR’S CONTROLLED EXPERIMENT

THE NEEDS OF LIVING THINGS

Needs of Living Things

Food

Heterotrophs

Autotrophs

Water

It breaks down food and dissolves chemicals

Living Space

Organisms compete

Stable Internal

Conditions

Homeostasis

SOURCES• https://

www.google.com.ec/search?q=redi&rlz=1C1ARAB_enEC497EC497&es_sm=93&source=lnms&tbm=isch&sa=X&ei=W-qLU5WcItSqsQSf-4CoAQ&ved=0CAgQ_AUoAQ&biw=1057&bih=572&dpr=0.9#facrc

• https://www.google.com.ec/search?q=pasteur&rlz=1C1ARAB_enEC497EC497&es_sm=93&source=lnms&tbm=isch&sa=X&ei=YuqLU7WDBpSvsASRhYHgAg&ved=0CAgQ_AUoAQ&biw=1057&bih

• https://www.google.com.ec/search?q=science+classroom&rlz=1C1ARAB_enEC497EC497&es_sm=93&source=lnms&tbm=isch&sa=X&ei=

• https://www.google.com.ec/search?q=seed&rlz=1C1ARAB_enEC497EC497&es_sm=93&source=lnms&tbm=isch&sa=X&ei=f-

• https://www.google.com.ec/search?q=cat+and+kittens&rlz=1C1ARAB_enEC497EC497&espv=2&source=lnms&tbm=isch&sa=X&ei=leuLU5rQL

• https://www.google.com.ec/search?q=baby+and+mother&rlz=1C1ARAB_enEC497EC497&espv=2&biw=1057&bih=572&tbm=isch&imgil=ZyM99Yz4rvB53M%253A%253Bhttps%253A%252F%252Fencrypted-tbn1.gstatic.com%252Fimages%253Fq%253Dtbn%253AANd9Gc

• https://www.google.com.ec/search?q=pasteur%27s+experiment&rlz=1C1ARAB_enEC497EC497&espv=2&source=lnms&tbm=isch&sa=X&ei=d-

• https://www.google.com.ec/search?q=redis+experiment&rlz=1C1ARAB_enEC497EC497&espv=2&source=lnms&tbm=isch&sa=X&ei=5uyLU5-GC8XMsQSNpIHgCg&v