Characteristics of Life. So, what is ALIVE? 6 Characteristics There are certain characteristics that...
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Transcript of Characteristics of Life. So, what is ALIVE? 6 Characteristics There are certain characteristics that...
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Characteristics of Life
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So, what is ALIVE?
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6 CharacteristicsThere are certain characteristics that all forms
of life share. To be classified as “LIVING” the following must be present:
• Organized• Grow and develop
• Reproduce• Respond to a stimulus
• Maintain certain internal conditions• Energy
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• Only those things that have all 6 characteristics of life are living.
• Things that have all characteristics of life are called
ORGANISMS
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Living Things are Organized• Whether an organism is made of one cell or
many cells, all living thing have structures that have specific functions
• Some living things contain only a single cell– These single-celled organisms are called
UNICELLULAR– They perform all the functions necessary for life
• Most living things are MULTICELLULAR– They contain two or more cells. Some have
hundreds, thousands, or even trillions of cells. Humans have approximately 6 trillion cells.
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Living Things Grow and Develop
• Increase in size• Development• LIFE SPAN: the
maximum length of time a particular organism can be expected to live.
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Living Things ReproduceThe process by which living things make more of the same type of living thing:
• Sexual Reproduction/two parents
• Asexual Reproduction/one parent
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Living Things Respond to Their Environment
• Stimuli=any change in the environment of an organism that produces a response by that organism.– Internal: hungry, thirsty– External: light, temperature
• Response= an action, movement, or change in behavior of the organism.
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Homeostasismaintain certain internal conditions
• Homeostasis: an organism’s ability to maintain steady internal conditions when outside conditions change.
– It ensures that cells can function, otherwise they may die.
• Methods of homeostasis– There is a limit to the amount of change that can occur
within an organism
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Living Things Use Energy
The cells of organisms use energy to do what living things must do.
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Energy is used when…
• Metabolism=the sum total of all the chemical reactions that occur in a living thing
• Ingestion=take in/or produce their food• Digestion=the process by which food is
broken down into simpler substances• Respiration=the process by which living
things take in oxygen and use it to produce energy
• Excretion=the process of getting rid of waste material
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Homework
• Read pages 9-15
• Copy the table 1 page 15 into NB by hand. You may draw or cut out pictures. You may also use the computer to type table out and cut & paste pictures
• YOU MAY NOT JUST PHOTO COPY THE PAGE!!