The Cell: The Basic Unit of Living Things

The Cell: The Basic Unit of Living Things

In this lesson, Miss Curd's 7th grade science class will learn about the four characteristics of life and the three basic needs of all living things. They will also explore

About The Cell: The Basic Unit of Living Things

PowerPoint presentation about 'The Cell: The Basic Unit of Living Things'. This presentation describes the topic on In this lesson, Miss Curd's 7th grade science class will learn about the four characteristics of life and the three basic needs of all living things. They will also explore. The key topics included in this slideshow are . Download this presentation absolutely free.

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Slide11.1C THE   CELL   IS   THE   BASIC UNIT   OF   LIVING   THINGS Miss Curd 7 th  Grade Science

Slide2ANSWER   THE   FOLLOWING  Summarize the four characteristics of life   Describe the three basic needs of all living things  What is the smallest unit of a living thing?  Explain the difference between Unicellular and Multicellular organisms  How did the invention of the microscope lead to the discovery of cells?  What is the cell theory  What did Louis Pasteur discover and what did he develop as a result?  What is spontaneous generation? Is it a valid theory? Why or why not

Slide3LIVING   THINGS   VS . N ON   LIVING   THINGS  What makes a living thing different from a non living thing?  There are 4 characteristics of life  Organization  How is the body organized?  The ability to develop and grow  The ability to respond to the environment  The ability to reproduce

Slide4WHAT   DO   LIVING   THINGS   NEED   TO SURVIVE ?  3 basic needs:  Energy  Where does the energy come from?  Plants use the Sun directly  Animals use food from plants or other organisms that eat the plants  Materials  What kind of materials to organisms need?  Carbon Dioxide, nitrogen, oxygen and water  Where does most of this come from?  Food  Space to live and grow  What happens if any of these requirements are missing?

Slide5WHAT   ARE   LIVING   THINGS   MADE   OF ?  Cells: smallest unit of a living thing  Organisms can be unicellular or multicellular……..what’s the difference?  Unicellular: made of a single cell and to small to see  Multicellular: made up of many cells, each having a different function  What is the difference between the needs and characteristics of a unicellular organism and a multicellular organism?  All have the same needs and characteristics  Unicellular: one cell carries out all of the activities for life  Multicellular: cells are specialized to do different jobs

Slide6THE   IMPORTANCE   OF   THE   MICROSCOPE  Instrument that makes an object appear bigger than it is  First came into use in the 1600’s  Robert Hooke and Anton van Leeuwenhoek were some of the first to describe cells  Hooke named the cell after looking at bark cells  Van Leeuwenhoek described the cell after looking at pond water

Slide7DO   ALL   LIVING   THINGS   HAVE   CELLS ?  Scientists started studying samples from various forms of living matter  Found cells in all of them  Not all were exactly the same  Saw that living cells divide  All of these findings led to the Cell Theory 1. Every living thing is made of one or more cells 2. Cells carry out the functions needed to support life 3. Cells come only from other living cells  What is a theory?

Slide8OTHER  I MPORTANT  S CIENTISTS  Matthais Schleiden concluded that all plants are made of cells  Theodor Schwann concluded that all animals are made of cells  Rudolf Virchow concluded that all cells come from other cells

Slide9LOUIS  P ASTEUR  Showed cell theory in the real world  Microscopic organisms are a cause of both spoilage of food and disease  Experiments showed that microscopic organisms (bacteria) were present in milk causing it to sour  Developed a process of pasteurizations using heat to kill bacteria  Started to wonder if these also caused illness in humans and animals  Led to treatment of rabies in humans  Disproved theory of spontaneous generation: the belief that bacteria grew from nonliving things