Topic: What is Life?

What do you need to survive?

In your SJ,

Make a list of the top 5 things you need to survive.

Share this list with your neighbor.

Leave your SJ open.

I. Characteristics of living things

Organism: living things (You!)

1. cellular organizations2. similar chemicals3. use energy4. grow and develop5. respond to surroundings6. reproduce

1. Cell: basic unit of structure and function of an organismA. Unicellular -

single cell1. bacteria2. diatoms

B. Multicellular - many cells doing certain tasks1. muscles2. nerves

2. Chemicals of Life

A. water is the MOST ABUNDANT CHEMICAL

B. carbohydrates are an energy source

C. proteins and lipids are building materials

D. nucleic acids are genetic material directing cell’s activities

3. Energy Use

A. doing what living things must do1. Eyes - reading

2. Stomach - digesting

3. Blood - moving chemicals throughout your body

4. Repair

4. Growth and DevelopmentA. Growth - becoming larger

B. Development - process of change during life

infanttoddlerpreschoolerschoolageteenageryoung adult

middle-age adultold age adult

5. Respond to Surroundings

A. Stimulus –

change in surroundings to cause organism to react

1. Light, sound, temperature

B. Response - an action or change in behavior

1. Stimulus causes a response

6. ReproductionA. To produce offspring which are similar to the parents

List 2 similarities you have that are like that of your parents, grandparents, or other relatives

Share

II. Experiments of Redi and Pasture Turn to Pages 10-11

1.Redi’s Experiment mid 1600s

A. Placed meat in two jars. One covered/one not.

B. Maggots appeared on the uncovered jar of meat.

C. Reasoned flies laid eggs on the uncovered meat.

2. Pasture’s Experiment mid 1800sA. Placed clear broth in 2 flasks with curved necks. Boiled only one flask.

B. After a few days, unboiled broth became cloudy.

C. Reasoned bacteria exists from previously existing bacteria.

Spontaneous Generation- living things arise from nonliving sourcesMistaken idea-frogs could sprout from mud ponds

Redi and Pasture disproved the spontaneous generation theory with a controlled experiment carrying out 2 identical tests except for one factor known as a variable. What were the variables in their experiments?

III. Needs of Living Things

What were the 5 items you listed that you needed to SURVIVE?

Living things must have:

1. Energy-Autotrophs: make their own foodHeterotrophs: eat autotrophs or other heterotrophs that eat autotrophs (animals)

2. Water-92% of your blood

3. Living space-provides food, water, shelter

4. Stable Internal Conditions-homeostasis

What did you learn?

Tell your neighbor the 6 characteristics of organisms.

What is the most abundant chemical?