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Characteristics of Living Things

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Characteristics of Living Things Chapter 1-Book A Initial Questions What do plants have in common with dogs? What do bacteria have in common with fish What people ... – PowerPoint PPT presentation

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Title: Characteristics of Living Things


1
Characteristics of Living Things
  • Chapter 1-Book A

2
Initial Questions
  • What do plants have in common with dogs?
  • What do bacteria have in common with fish
  • What people have in common with SLIME MOLD?

3
Living things have cells
4
Cells
  • A cell is the smallest unit that can perform all
    life processes
  • Cells are covered by a membrane and have DNA and
    cytoplasm
  • Most cells cannot be seen with the naked eye

5
Cell functions
  • Some organisms are made up of TRILLIONS of cells
  • Different types of cells have different functions
  • For instance.nerve cells transport signals and
    muscle cells are specialized for movement!
  • In organisms with one cell, different parts of
    the cell performs different functions (in a
    paramecium, part of the cell will eat, for
    example)

6
STIMULUS
  • Stimulus anything that causes a reaction or
    change in an organism or any part of an organism
  • ALL organisms have the ability to sense change in
    their environment, and to respond to that change
  • How do pupils respond to light?
  • Stimuli (plural) can be light, chemicals,
    gravity, sounds, hunger, or ANYTHING that causes
    an organism to respond in some way

7
Example of Stimulus in Nature

8
Brainpop Video on the Venus Fly Trap
  • http//www.brainpop.com/science/diversityoflife/ca
    rnivorousplants/

9
Homeostasis
  • Organisms must maintain a stable internal
    environment..
  • For instance, what is the average human body
    temperature?
  • Homeostasis is the maintenance of a constant
    internal state in a changing environment

10
Brainpop video on homeostasis
  • http//www.brainpop.com/health/endocrinesystem/hom
    eostasis/

11
Responding to External Changes
  • What happens when you get hot? Why?
  • What happens when you get cold? Why?
  • Whether youre sweating or shivering, your body
    is trying to return itself to normal temperature
  • Animals control their temperature by moving from
    one environment to the other

12
Living things reproduce
  • Organisms make other organisms similar to
    themselves
  • Sexual reproduction-reproduction in which the sex
    cells from two parents unite, producing offspring
    that share traits from both parents

13
Asexual Reproduction
  • Asexual reproduction reproduction that does not
    involve the union of sex cells and in which on
    parent produces offspring identical to itself
  • Many invertebrates are asexual, as do single
    celled organisms

14
Brainpop Video on Asexual Reproduction
  • http//www.brainpop.com/science/reproductionandher
    edity/asexualreproduction/

15
Living Things have DNA
  • DNA-stands for deoxyribonucleic acid
  • Controls the structure and function of the cell
  • When organisms reproduce, they pass copies of
    their DNA to their offspring (therefore
    offsprings DNA resembles their parents DNA)
  • Passing of traits from one generation to the next
    is call HEREDITY

16
Living things use energy
  • Organisms use energy to carry out all life
    activities (making food, breathing, walking)
  • METABOLISM the sum of all chemical processes
    that occur in an organism

17
Living things grow and develop
  • ALL living things grow
  • Single-celled organisms the cell gets larger and
    divides, making other organisms
  • In other organisms, the number of cells grow, and
    the organism gets bigger
  • Animals/humans also develop as they go through
    different life stages
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