Discovering Cells

Leeuwenhoek was so excited about what he saw because:

• he discovered tiny living organisms never seen before

• he found a new planet

• he invented the first telescope

• he saw colors for the first time

Vocabulary: What is the term for the basic unit of life?

• Cell

• Microscope

• Cell theory

Classify: On each blank arrow, write the name of a material that moves as shown. Food: _______

• food

• water

• air

• light

Classify: On each blank arrow, write the name of a material that moves as shown. Water: _______

• water

• sand

• air

• oil

Classify: On each blank arrow, write the name of a material that moves as shown. Oxygen: _______

• oxygen

• carbon dioxide

• glucose

• water

Classify: On each blank arrow, write the name of a material that moves as shown. Carbon dioxide: _______

• carbon dioxide

• oxygen

• water

• glucose

Assess Your Understanding: I get it! Now I know that a cell is the basic unit of _______.

• life

• energy

• matter

• water

Fill in the circle next to the name of the person who was the first to see living cells through a microscope.

• Matthias Schleiden

• Robert Hooke

• Anton van Leeuwenhoek

• Rudolf Virchow

• Theodor Schwann

Relate Cause and Effect: Hooke's discovery would have been impossible without a microscope because:

• the microscope allowed him to see tiny structures not visible to the naked eye.

• the microscope made objects larger than they actually are.

• the microscope was used to draw pictures of cells.

• the microscope was invented by Hooke himself.

Apply Concepts: According to Virchow's ideas, plastic plants and stuffed animals are not alive because they do not have what?

• Cells

• Color

• Movement

• Shape