living things ch2.1 7th pdf
DESCRIPTION
Information obtained from Holt Science and Technology: Life Science. Austin: Holt Rinehart & Winston, 2007. Print.TRANSCRIPT
Chapter 2 Section 1
Objectives
Describe 6 characteristics of living things
Describe how organisms maintain stable internal conditions
Explain how asexual reproduction differs from sexual reproduction
Living Things Have Cells
All living things are composed of one or more cells
Cells are membrane covered structures that contain all the materials necessary for life
Smallest unit that can perform all life processes
Covered by membrane; have DNA and cytoplasm
Living Things Sense & Respond to Change
All organisms have the ability to sense change in their environment and respond to that change
Stimulus: a change that affects the activity of the organism (ex: your pupils responding to a change in light)
Can you list some stimuli you experience??
Homeostasis
Organisms maintain a stable internal environment in order to survive
Responding to external changes:
Sweating
Shivering
How do reptiles do this??
Living Things Reproduce
Sexual reproduction: 2 parents produce offspring that will share the characteristics of both parents (ex: bear cubs)
Asexual reproduction: a single parent produces offspring that are identical to the parent (ex: hydra)
Living Things Have DNA
Deoxyribonucleic acid (DNA)
Controls the structure and function of cells
Copies are passed to offspring
Heredity: passing of traits from one generation to the next
Living Things Use Energy
Activities of life: making food, breaking down food…
Metabolism is the sum of all chemical processes that occur in an organism
Can you name 2 other processes that require energy??
Quick Quiz
Explain how you can tell an apple tree is a living thing?
What is the difference between growth and development?
Name 3 activities of an organism that require energy.