1 1 Observing Living Things Living things can

1. 1 Observing Living Things • Living things can survive in almost any kind of environment. • Living things have features that help them survive. • For example, hummingbirds can beat their wings up to 80 times per second, allowing them to hover and change direction rapidly. • All living things have needs that must be met if they are to survive. See pages 8 - 9 (c) Mc. Graw Hill Ryerson 2007

Characteristics of Living Things • There are 5 characteristics of living things: w Living things respond to their environment w Living things need energy w Living things grow w Living things reproduce w Living things must get rid of waste See page 10 (c) Mc. Graw Hill Ryerson 2007

Examining Very Small Living Things • The microscope is used by scientists to observe very small unicellular and multicellular living things. • Early microscopes were built in the late 1600’s. • Anton van Leeuwenhoek was one of the first people to build a microscope. • He could magnify up to 250 x, and used it to observe microscopic living things. Water flea (Daphnia) See page 11 (c) Mc. Graw Hill Ryerson 2007

Compound Light Microscope • The compound light microscope has two sets of lenses that magnify an image. • Each of the objective lenses has a different magnification power. w Low power = 4 x objective w Med power = 10 x objective w High power = 40 x objective • Multiply the objective by the eyepiece for total magnification. w Example: High Power = 40 x 10 = 400 x Do you know all the compound microscope parts? See pages 12 -13 (c) Mc. Graw Hill Ryerson 2007

Resolving Power • The ability to distinguish between two dots or objects that are very close together is called resolving power. • The human eye has a certain resolving power. You can see the individual dots in diagrams A, B and C. The human eye does not have the resolving power to see the dots in diagram D. Can you think of ways to increase resolving power? Take the Section 1. 1 Quiz See page 14 (c) Mc. Graw Hill Ryerson 2007