Science - Grade 7: Lesson 1

What is an organism?

A living thing

Define lens

A curved piece of glass that refracts light

Define magnification

how much bigger a sample appears to be under the microscope than it is in real life

define chroma

The purity or strength of a color

define multi

many

define cells

Cells are the basic units of structure and function in living things.

Define microscope

device that produces magnified images of structures that are too small to see with the unaided eye

Who was the first researcher to see bacteria under a microscope?

Anton Van Leeuwenhoek

When was the first microscope invented?

1590

First to use the microscope to observe "cells"

Robert Hooke

First to see living cells

Anton van Leeuwenhoek

The cell theory states

All living things are made up of cells, cells are the basic units of structure and function in living things, new cells are produced from existing cells

Some microscopes focus light through lenses to produce a magnified image, and other microscopes use _____________

beams of electron

lab safety rules

Goggles, Eye Wash, No eating or drinking, be calm, Pay attention, follow directions