Living Things Ch2.1 7th Pdf

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.