Topic 1 - Living Organisms 2

Topic 1 - Living Organisms 2

Levels of organisms

• In the previously you saw that organisms have very specialized structures to carry out their various functions.

Multiple Choice

According to _____________ the cork seemed to be made up of empty little boxes, which he named cells.

• Robert Hooke

• Anton Van Leewenhoek

• Rudolph Virchow

• Theodor Schwann

• Matthias Schleiden

Multiple Choice

_____________ determined plants are composed of cells

• Robert Hooke

• Anton Van Leewenhoek

• Rudolph Virchow

• Theodor Schwann

• Matthias Schleiden

Multiple Choice

_____________ stated that all living cells come from other living cells

• Robert Hooke

• Anton Van Leewenhoek

• Rudolph Virchow

• Theodor Schwann

• Matthias Schleiden

Cell Theory

In biology, the cell theory is a scientific theory which describes the properties of all cells.

There are 4 scientists that made large contributions to the cell theory.

Robert Hooke

• 1665

• English scientist that cut a thin slice of cork and looked at it under his microscope.

• To him, the cork seemed to be made up of empty little boxes, which he named cells.

Anton Van Leewenhoek

• 1673

• Dutch naturalist who created a very powerful (for the time period) single lens microscope

• He observed pond water. In pond scum he discovered small animals

• Also discovered bacteria while examining scraping of crud from his teeth.

Matthias Schleiden

• 1838

• German botanist who determined plants are composed of cells.

Theodor Schwann

• (1810-1882) 

• German physiologist and histologist who in 1838 and 1839 identified the cell as the basic structure of plant and animal tissue

Rudolph Virchow

• 1858

• A doctor who stated that all living cells come from other living cells

Cell become systems

• Over many years of study, scientists have come to understand that most organisms have systems that perform certain functions to keep the organism alive.

Levels of Organization in Organisms

Major organs such as the heart are made from tissues. These are groups of cells that perform similar functions. The basic unit of every

system is the cell. For scientists, the cell is the feature that separates all forms of life from non-living things: All living organisms are made up of cells. The cell is the smallest thing that scientists consider to be alive.

Before We Go Lets Do an INFO Check

Multiple Choice

Every organ in the body is consisted of some .................

• organs
• glands
• tissues
• systems

Multiple Choice

Every system in the body is consisted of some ..................

• organs
• tissues
• nerves
• glands

Multiple Choice

Every tissue in the body is consisted of similar ......................

• tissues
• organs
• systems
• cells

Multiple Choice

The body of a living organism is made up of systems that work together in harmony.

• True
• False

Multiple Choice

All the living organisms have common properties as sensation, reproduction, motion, respiration and nutrition.

• True
• False

Multiple Choice

The animals that prey on other animals are known as _______

• preyers

• herbivores

• predators

Multiple Choice

The plants and animals that live on land are called _______

• terrestrial

• aquatic

• arboreal

Multiple Choice

The special features which enable living organisms to survive in their surrounding is known as _______

• habitat

• adaptation

• abiotic

Multiple Choice

Which of these are the characteristics of a living organism ?

• They grow

• They reproduce

• Both

Multiple Choice

The surroundings where living organisms live is known as _______

• Habitat

• adaptation

• none