When the net force on an object is non-zero, the forces on the object are called ___.

An object subjected to multiple forces moves under the effect of ____.

What is the S.I. unit of force?

Forces directed along the same direction ____ to get the net force.

When the net force on an object is zero, the forces on the object are called _____.

Whose observation is this?

Robert Hooke used a thin slice of cork to observe under microscope and found honeycomb like structure.

The cell theory was made by _________.

Schlieden and Schwann both were German physician and also worked great in botany as well by giving cell theory.

Theodore Schwann was a _____.

• He observed cell as basic unit in animal.
• Worked with Schlieden to introduce cell theory.

Who used this microscope for observing cells?

• The microscope was used by Robert Hooke to introduce cell theory.
• He stated cell as basic unit of plant structure.

Matthias Schleiden was a ______ scientist.

• He belonged to Germany.
• In 1838 , he defined cell as basic unit of plant structure.
• After an year Schwann told that cell is basic unit of animal structure also .
• Both gave cell theory.

The following picture is of__________.

• He said that it seems like cellula or small rooms so named as cell.
• He saw dead cell wall (cork) under microscope.
• He borne on 18th July 1635 & died on 3rd March 1703

Who discovered bacteria?

• He refered bacteria as dierkens i.e. small animals in English. 

____ observed the various types of cells in plant tissue.

Robert Hooke used _________ to observe the cells.

• Robert Hooke told first time that the cells are the basic unit of plant structure in 1655.

Rudolph Virchow’s observation of cell was put forth in the year______.

_________ is not explained by cell theory.

• Cells are formed from pre existing cells - Rudolf Virchow.
• Cells are basic unit of plant structure - Schlieden
• Cells are basic unit of animal structure - Schwann