living things indiana science grade 7 pages 14 - 21
TRANSCRIPT
Living ThingsLiving Things
Indiana Science Grade 7Pages 14 - 21
Living Things
How are living things, or organisms, alike?1. Living things are organized.
1. The Cell – the smallest unit of an organism2. Each cell contains an orderly structure3. And contains genetic information
Living Things
2. Living things respond.1. A stimulus – anything that causes some change
in an organism.2. Response – the way an organism reacts to a
stimulus.Example: Getting a leash out = dogs go crazy!!3. .Homeostasis – maintaining the proper
conditions in a organism/cell.
Living Things
3. Living things use energy.Autotroph = produces own energy (plant-like)Heterotroph = eats energy (animal-like)
4. Living things reproduce.
Living Things
5. Living things grow and develop.1. Growth of many-celled organism (multicellular)
is due to an increase in the number of cells.2. Growth of a single-celled organism (unicellular)
is due to an increase in the size of the cell.3. .Development – changes that take place during
the life of an organism.
Living Things
What do living things need?1. A place to live – habitat.2. .Raw materials – like water, proteins, fats,
and sugars.
Living Things
Where Does Life Come From?1. .Spontaneous Generation – early theory that
living things could come from nonliving things; ie. mice from hay stacks, snakes from logs…
Was later disproved by Pasteur in mid-1800s.
Living Things
2. .Biogenesis – theory that living things come only from other living things.
3. Alexander Oparin’s hypothesis on the origins of life – gases on Earth’s early atmosphere combined to form complex compounds found in living things.
Living Things
• 4 Gases:– .Ammonia– .Hydrogen– .Methane– .Water Vapor
• Miller and Urey tested Oparin’s hypothesis and showed that chemicals (amino acids) found in living things could be produced.
Living Things
• Vocabulary Review (use the Living Things Voc sheet)
Organism Heterotroph
Cell Unicellular
Homeostasis Multicellular
Autotroph Stimulus
Response