characteristics of life notes review
TRANSCRIPT
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Ch. 1.1 Characteristics of Life
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What characteristics do all living things share?
• Set up a concept map or foldable with 6 spots & enough space to include:
– Name of characteristic– Description– Pictures/examples
• Add titles for characteristics:1. Organization2. Growth & development3. Reproduction4. Response to stimuli5. Homeostasis6. Use of Energy
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1. Organization• All living things have one or more cells. • Unicellular organisms (1 cell) have specialized
structures that function to help it survive.• Multicellular organisms (more than 1 cell) have
many types of specialized cells that are organized into groups based on their functions.
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1. OrganizationExample
Organism
Organ System
Organ
Tissue
Cell
5 Levels of Organization
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2. Growth & Development• Living things grow by increasing cell size
and/or increasing the number of cells.• Multicellular organisms develop, or change
over time.
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3. Reproduction
• An organism can make one or more organisms through the process of reproduction, which is how a species survives.
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3. Reproduction
• Cells dividing into 2 new cells
• Bird laying eggs• Pollinated
flowers making new seeds
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4. Response to stimuli
• Living things adjust and respond to changes in their internal and external environments.– Stimuli = internal or external changes
(hunger, feeling cold, etc.)– Response = the reaction to the change
(eating, shivering, etc.
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4. Response to Stimuli• Internal: feeling hungry and then eating• External: feeling hot and then sweating
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5. Homeostasis
• Living things are able to maintain steady internal conditions (inside body), when outside environment changes.
• Stable internal environment
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5. Homeostasis
• Keeping a body temperature of ~ 98.6○, regardless of weather
• Getting rid of excess fluids
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6. Use of Energy
• Living things use energy for all the things they do.
• They get energy by producing it themselves, eating food, or absorbing food.
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6. Use of energy• Plants get energy from the sun, animals get energy
from plants• Some don’t need sunlight for energy (deep in ocean)
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Review questions
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What term refers to things that have all the characteristics of life?
a. cellsb. unicellular organismsc. organismsd. multicellular organisms
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What term refers to things that have all the characteristics of life?
a. cellsb. unicellular organismsc. organismsd. multicellular organisms
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Which of these refers to changes in an organism’s environment?
a. External stimulib. Homeostasisc. Internal stimulid. Development
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Which of these refers to changes in an organism’s environment?
a. External stimulib. Homeostasisc. Internal stimulid. Development
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Homeostasis refers to an organism’s ability to maintain stable ______ conditions?
a. Externalb. Internalc. Cellulard. Environmental
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Homeostasis refers to an organism’s ability to maintain stable ______ conditions?
a. Externalb. Internalc. Cellulard. Environmental
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Which characteristic of life does this example refer to:
mosquito larvae changing into an adult mosquito?
a. Growth & developmentb. Organizationc. Reproductiond. Homeostasis
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Which characteristic of life does this example refer to:
mosquito larvae changing into an adult mosquito?
a. Growth & developmentb. Organizationc. Reproductiond. Homeostasis
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Which characteristic of life does this example refer to:
a bacterium dividing into 2 bacteria?a. Growth & developmentb. Organizationc. Reproductiond. Energy
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Which characteristic of life does this example refer to:
a bacterium dividing into 2 bacteria?a. Growth & developmentb. Organizationc. Reproductiond. Energy
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Which characteristic of life does this example refer to:
eating because you feel hungry?a. Response to stimulib. Organizationc. Reproductiond. Homeostasis
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Which characteristic of life does this example refer to:
eating because you feel hungry?a. Response to stimulib. Organizationc. Reproductiond. Homeostasis
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Which characteristic of life does this example refer to:
your body temperature staying the same?
a. Energyb. Response to stimulic. Reproductiond. Homeostasis
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Which characteristic of life does this example refer to:
your body temperature staying the same?
a. Energyb. Response to stimulic. Reproductiond. Homeostasis
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Which characteristic of life does this example refer to:
what you need for doing all activities?a. Growth & developmentb. Energyc. Reproductiond. Homeostasis
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Which characteristic of life does this example refer to:
what you need for doing all activities?a. Growth & developmentb. Energyc. Reproductiond. Homeostasis
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Which characteristic of life does this example refer to:
groups of cells working together as a tissue?
a. Growth & developmentb. Organizationc. Response to stimulid. Homeostasis
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Which characteristic of life does this example refer to:
groups of cells working together as a tissue?
a. Growth & developmentb. Organizationc. Response to stimulid. Homeostasis
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What kind of organism is a human?
a. Single-celled organismb. Multicellular organism
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What kind of organism is a human?
a. Single-celled organismb. Multicellular organism
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Which of the following is NOT an example of maintaining homeostasis?
a. Sweating when hotb. Getting a fever when sickc. Eating when your stomach growlsd. Eyes dilating when in the dark
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Which of the following is NOT an example of maintaining homeostasis?
a. Sweating when hotb. Getting a fever when sickc. Eating when your stomach growlsd. Eyes dilating when in the dark