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Living Systems

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Living Systems. Chapter Two: Living Things. 2.1 Is it Alive? 2.2 What is a Living System?. Investigation 2A. Plant Growth. What conditions are ideal for the growth of clover plants?. 2.1 Is it alive?. An organism is an individual form of life.

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chapter two living things
Chapter Two: Living Things
  • 2.1 Is it Alive?
  • 2.2 What is a Living System?
investigation 2a
Investigation 2A

Plant Growth

  • What conditions are ideal for the growth of clover plants?
2 1 is it alive
2.1 Is it alive?
  • An organismis an individual form of life.
  • Biologists often use five basic rules to classify something as living or nonliving.

Yeast is a living organism.

Each tiny sphere is an individual living thing.


Characteristics of Living Things

  • All living things respond to a stimulus. The sunlight is a stimulus and the frog’s choice to sun himself is called a response.
  • All living things take materials from their surroundings such as food, water, and gases and use these materials to get energy.
  • Growth refers to an increase in mass and to an increase in number of cells.
  • The process of making more of the same kind of organism is called reproduction.
  • A cell is the smallest unit of a living thing.
2 1 is it alive7
2.1 Is it alive?
  • This is a barnacle.
  • Read about the five characteristics of life on page 29.
  • Then decide whether it is alive.
2 1 is it alive8
2.1 Is it alive?
  • Barnacles respondto their environment by closing their shells at low tide, and opening them at high tide.
  • Barnacles growand develop. They begin life as free-swimming creatures. Once they find a good spot, they “glue” themselves to a rock and form a shell.
  • Barnacles reproduce. After fertilization from a male barnacle, females hold the eggs in their shells until they hatch.
  • By waving their legs, barnacles capture food. They use energyfrom the food to move their legs, open and close their shells, and carry out all life processes.
  • If you examined the legs of a barnacle with a microscope you would see that they are made of individual cells.
2 1 types of energy
2.1 Types of energy
  • Energyis sometimes defined as the ability to cause change or do work.
  • There are many forms of energy.
  • Any form can be converted into any other form.