Class 8 Biology Introduction to Cells

Class 8 Biology Introduction to Cells

 

[1] Who discovered cells in 1665 by observing slices of cork?

• Charles Darwin
• Robert Hooke
• Louis Pasteur
• Antonie van Leeuwenhoek

 

[2] What is the basic structural unit of an organ according to Robert Hooke?

• Tissue
• Cell
• Molecule
• Atom

 

[3] Which of the following is responsible for receiving and transmitting messages to control and coordinate different parts of the body?

• Nerve cells
• White blood cells
• Plant cells
• Bacterial cells

 

[4] What is the function of the cell membrane in plants and animals?

• To provide shape and rigidity
• To allow for the exchange of materials
• To carry out photosynthesis
• To regulate the movement of water

 

[5] What determines the size of a cell?

• The size of the organism
• The function of the cell
• The number of cells in the organism
• The type of organism

 

[6] Which of the following is NOT a shape that cells can have?

• Elongated
• Branched
• Triangular
• Round

 

[7] What marked the beginning of the study of cell biology?

• The discovery of single-celled organisms
• The discovery of multicellular organisms
• The discovery of bacteria
• The discovery of cells by Robert Hooke.

Answers

1. Robert Hooke
2. Cell
3. Nerve cells
4. To allow for the exchange of materials
5. The function of the cell
6. Triangular
7. The discovery of cells by Robert Hooke.

Answer the following questions:

Q: Who discovered cells and when?

A: Robert Hooke discovered cells in 1665.

 

Q: What is a basic structural unit of an organ in living organisms?

A: Cells are the basic structural units of an organ in living organisms.

 

Q: What is the difference between unicellular and multicellular organisms?

A: Unicellular organisms are made up of a single cell, while multicellular organisms are made up of multiple cells.

 

Q: What is the size of the largest cell and which organism does it belong to?

A: The largest cell is the egg of an ostrich, measuring 170 mm × 130 mm.