Introduction to cells - Exercise - Class 9 Biology- Science Class 9 Notes | EduRev

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Class 9 : Introduction to cells - Exercise - Class 9 Biology- Science Class 9 Notes | EduRev

 Page 2


 
  
INTRODUCTION TO CELLS 
 
• Cells are the building blocks of any living organism. 
• Cells are rightly defined as the fundamental unit of life. 
• Robert Hooke discovered cells in the year 1665. 
• Many cells come together to form a tissue, many types of tissues make 
up an organ, and various organs in the body finally make up an 
organism. 
• Based on the number of cells present in any organism, there can be two 
types of organisms, unicellular and multicellular.  
• There are various shapes of a cell, it can be round and spherical or long 
and elongated. The outer covering or the cell membrane gives the cell its 
shape. 
• The smallest cell is a bacterial cell whereas the largest cell is the egg of 
an ostrich.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Page 3


 
  
INTRODUCTION TO CELLS 
 
• Cells are the building blocks of any living organism. 
• Cells are rightly defined as the fundamental unit of life. 
• Robert Hooke discovered cells in the year 1665. 
• Many cells come together to form a tissue, many types of tissues make 
up an organ, and various organs in the body finally make up an 
organism. 
• Based on the number of cells present in any organism, there can be two 
types of organisms, unicellular and multicellular.  
• There are various shapes of a cell, it can be round and spherical or long 
and elongated. The outer covering or the cell membrane gives the cell its 
shape. 
• The smallest cell is a bacterial cell whereas the largest cell is the egg of 
an ostrich.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Questionnaire 
 
Q1. What is the basic component present in all these living organisms?  
 
Q.2 Complete the flow diagram starting and define cell? 
CELL- ____________-_____________- ORGANISM. 
 
Q.3 Choose the correct alternative: 
1)  Cell was discovered by _____________  
a) Robert hill  
b) Robert hooke  
c) Richard hooke 
d) None of the above 
 
2) Amoeba is an example of  __________ type of organism.  
 a) Acellular  
b) Unicellular  
Page 4


 
  
INTRODUCTION TO CELLS 
 
• Cells are the building blocks of any living organism. 
• Cells are rightly defined as the fundamental unit of life. 
• Robert Hooke discovered cells in the year 1665. 
• Many cells come together to form a tissue, many types of tissues make 
up an organ, and various organs in the body finally make up an 
organism. 
• Based on the number of cells present in any organism, there can be two 
types of organisms, unicellular and multicellular.  
• There are various shapes of a cell, it can be round and spherical or long 
and elongated. The outer covering or the cell membrane gives the cell its 
shape. 
• The smallest cell is a bacterial cell whereas the largest cell is the egg of 
an ostrich.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Questionnaire 
 
Q1. What is the basic component present in all these living organisms?  
 
Q.2 Complete the flow diagram starting and define cell? 
CELL- ____________-_____________- ORGANISM. 
 
Q.3 Choose the correct alternative: 
1)  Cell was discovered by _____________  
a) Robert hill  
b) Robert hooke  
c) Richard hooke 
d) None of the above 
 
2) Amoeba is an example of  __________ type of organism.  
 a) Acellular  
b) Unicellular  
c) Multi cellular 
d) Bothe a and b 
 
3) Longest cell in the human body is___________  
a) Sperm cell  
b) Nephron  
c) Nerve cell 
d) Both b and c 
 
4) Smallest cell in the human body is ___________  
 a) RBC  
 b) WBC  
 c) Nephron  
 d) None of the above 
 
 
 
 
 
 
 
 
 
 
 
Page 5


 
  
INTRODUCTION TO CELLS 
 
• Cells are the building blocks of any living organism. 
• Cells are rightly defined as the fundamental unit of life. 
• Robert Hooke discovered cells in the year 1665. 
• Many cells come together to form a tissue, many types of tissues make 
up an organ, and various organs in the body finally make up an 
organism. 
• Based on the number of cells present in any organism, there can be two 
types of organisms, unicellular and multicellular.  
• There are various shapes of a cell, it can be round and spherical or long 
and elongated. The outer covering or the cell membrane gives the cell its 
shape. 
• The smallest cell is a bacterial cell whereas the largest cell is the egg of 
an ostrich.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Questionnaire 
 
Q1. What is the basic component present in all these living organisms?  
 
Q.2 Complete the flow diagram starting and define cell? 
CELL- ____________-_____________- ORGANISM. 
 
Q.3 Choose the correct alternative: 
1)  Cell was discovered by _____________  
a) Robert hill  
b) Robert hooke  
c) Richard hooke 
d) None of the above 
 
2) Amoeba is an example of  __________ type of organism.  
 a) Acellular  
b) Unicellular  
c) Multi cellular 
d) Bothe a and b 
 
3) Longest cell in the human body is___________  
a) Sperm cell  
b) Nephron  
c) Nerve cell 
d) Both b and c 
 
4) Smallest cell in the human body is ___________  
 a) RBC  
 b) WBC  
 c) Nephron  
 d) None of the above 
 
 
 
 
 
 
 
 
 
 
 
Answers 
 
Q1. What is the basic component present in all these living organisms?  
Answer: Cells. 
 
Q.2 Complete the flow diagram and define cell. 
CELL- TISSUE- ORGAN- ORGANISM.  
Cells are the most basic and fundamental unit of life. 
 
Q.3 Choose the correct alternative: 
1) b) Cell was discovered by Robert hooke 
2) b) Amoeba is an example of  Unicellular type of organism  
3) c) Longest cell in the human body is Nerve cell  
4) a) Smallest cell in the human body is RBC 
 
 
 
 
 
        End 
 
 
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