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.