Notes : Cell - Structure & Functions Class 8 Notes | EduRev

Created by: Paras Saxena

Class 8 : Notes : Cell - Structure & Functions Class 8 Notes | EduRev

 Page 1


BAL BHARATI PUBLIC SCHOOL, PITAMPURA, DELHI-110034 
   CLASS 8 CORE ASSIGNMENT 
CELL : STRUCTURE AND FUNCTIONS 
 
Q1. Write a short account on discovery of cell. 
A. Robert Hooke in 1665 observed slices of cork under a simple microscope. He noticed 
partitioned boxes or compartments in the cork slice. These boxes appeared like a honey-
comb. Hooke coined the term ‘cell’ for each box. 
 
Q2. Why is cell called the basic structural unit of life? 
A.All living beings are made up of cells. Cell is the smallest living entity performing all 
life processes. 
 
Q3. What is a cell? 
A. Cell is the basic structural and functional unit of life. 
 
Q4. What are cell organelles? 
A. They are the small compartments in the cell specialized in their activities. E.g., 
chloroplast, mitochondria, vacuole. 
 
Q5. Name the smallest and the largest living cell. 
A. Smallest cell- bacteria largest cell- ostrich’s egg 
 
Q6. Cells vary in shape. Justify this statement by drawing three different cells of different 
shapes. 
A. 
A 
Page 2


BAL BHARATI PUBLIC SCHOOL, PITAMPURA, DELHI-110034 
   CLASS 8 CORE ASSIGNMENT 
CELL : STRUCTURE AND FUNCTIONS 
 
Q1. Write a short account on discovery of cell. 
A. Robert Hooke in 1665 observed slices of cork under a simple microscope. He noticed 
partitioned boxes or compartments in the cork slice. These boxes appeared like a honey-
comb. Hooke coined the term ‘cell’ for each box. 
 
Q2. Why is cell called the basic structural unit of life? 
A.All living beings are made up of cells. Cell is the smallest living entity performing all 
life processes. 
 
Q3. What is a cell? 
A. Cell is the basic structural and functional unit of life. 
 
Q4. What are cell organelles? 
A. They are the small compartments in the cell specialized in their activities. E.g., 
chloroplast, mitochondria, vacuole. 
 
Q5. Name the smallest and the largest living cell. 
A. Smallest cell- bacteria largest cell- ostrich’s egg 
 
Q6. Cells vary in shape. Justify this statement by drawing three different cells of different 
shapes. 
A. 
A 
 
Q7. Differentiate between:- 
1. Unicellular and multicellular organisms 
 
UNICELLULAR ORGANISM MULTICELLULAR ORGANISM 
1. organisms made up of single cell 1. Organisms made up of many cells. 
2. All the life processes are done within the 
single cell 
2. Such life processes are performed by 
specialised tissues 
 
2. Cell wall and cell membrane 
 
CELL WALL CELL MEMBRANE 
1. It is present only in plant cells. 1. It is present in both plants and animal 
cells. 
2. It provides protection against various 
natural pressures. 
2. It controls the entry and exit of various 
material 
3. It provides rigidity to the shape of the 
cell. 
3. It provides shape to plant and animal 
cells. 
 
3. plant cell and animal cell 
PLANT CELL ANIMAL CELL 
1. Cell wall is present. 1. Cell wall is absent. 
2. Plastid  are present 2. Plastids are absent. 
3. Have one big, central vacuole. 3. Vacuoles are numerous and many. 
4. Nucleus is shifted to a corner. 4. Nucleus is centrally located. 
 
4. prokaryotic cell and eukaryotic cell 
 
PROKARYOTIC CELL EUKARYOTIC CELL 
1. Nucleus is not well defined. 2. Nucleus is well defined with a nuclear 
membrane. 
2. Bacteria and blue green algae are 
prokaryotes. 
2. Fungi, animals, plants are all eukaryotes. 
 
 
Q8. Name the parts of the nucleus and state the function of the nucleus. 
A. Following are the parts of the nucleus:- 
1. Nuclear membrane  2. Nucleolus     
3. Chromosomes  4. Nucleoplasm 
 
Q9. What is a gene?  
A.It is the unit of inheritance, helping in transfer of characters from parents to the 
offspring. 
 
 
 
Page 3


BAL BHARATI PUBLIC SCHOOL, PITAMPURA, DELHI-110034 
   CLASS 8 CORE ASSIGNMENT 
CELL : STRUCTURE AND FUNCTIONS 
 
Q1. Write a short account on discovery of cell. 
A. Robert Hooke in 1665 observed slices of cork under a simple microscope. He noticed 
partitioned boxes or compartments in the cork slice. These boxes appeared like a honey-
comb. Hooke coined the term ‘cell’ for each box. 
 
Q2. Why is cell called the basic structural unit of life? 
A.All living beings are made up of cells. Cell is the smallest living entity performing all 
life processes. 
 
Q3. What is a cell? 
A. Cell is the basic structural and functional unit of life. 
 
Q4. What are cell organelles? 
A. They are the small compartments in the cell specialized in their activities. E.g., 
chloroplast, mitochondria, vacuole. 
 
Q5. Name the smallest and the largest living cell. 
A. Smallest cell- bacteria largest cell- ostrich’s egg 
 
Q6. Cells vary in shape. Justify this statement by drawing three different cells of different 
shapes. 
A. 
A 
 
Q7. Differentiate between:- 
1. Unicellular and multicellular organisms 
 
UNICELLULAR ORGANISM MULTICELLULAR ORGANISM 
1. organisms made up of single cell 1. Organisms made up of many cells. 
2. All the life processes are done within the 
single cell 
2. Such life processes are performed by 
specialised tissues 
 
2. Cell wall and cell membrane 
 
CELL WALL CELL MEMBRANE 
1. It is present only in plant cells. 1. It is present in both plants and animal 
cells. 
2. It provides protection against various 
natural pressures. 
2. It controls the entry and exit of various 
material 
3. It provides rigidity to the shape of the 
cell. 
3. It provides shape to plant and animal 
cells. 
 
3. plant cell and animal cell 
PLANT CELL ANIMAL CELL 
1. Cell wall is present. 1. Cell wall is absent. 
2. Plastid  are present 2. Plastids are absent. 
3. Have one big, central vacuole. 3. Vacuoles are numerous and many. 
4. Nucleus is shifted to a corner. 4. Nucleus is centrally located. 
 
4. prokaryotic cell and eukaryotic cell 
 
PROKARYOTIC CELL EUKARYOTIC CELL 
1. Nucleus is not well defined. 2. Nucleus is well defined with a nuclear 
membrane. 
2. Bacteria and blue green algae are 
prokaryotes. 
2. Fungi, animals, plants are all eukaryotes. 
 
 
Q8. Name the parts of the nucleus and state the function of the nucleus. 
A. Following are the parts of the nucleus:- 
1. Nuclear membrane  2. Nucleolus     
3. Chromosomes  4. Nucleoplasm 
 
Q9. What is a gene?  
A.It is the unit of inheritance, helping in transfer of characters from parents to the 
offspring. 
 
 
 
Q10. What is the function of a cell wall in plant cells? 
A.  Plant cells have cell wall which is required for additional protection against variations 
in temperature, high wind speed, etc. 
 
Q11. What are plastids?  
A. They are small coloured bodies in the cytoplasm of the plant cells. 
 
Q12. What are chloroplasts? 
A. They are the green coloured plastids having chlorophyll in them. They provide green 
colour to the plants and help in photosynthesis. 
 
Q13. Draw a well labeled diagrams of plant cell and animal cell. 
 
 
 
Page 4


BAL BHARATI PUBLIC SCHOOL, PITAMPURA, DELHI-110034 
   CLASS 8 CORE ASSIGNMENT 
CELL : STRUCTURE AND FUNCTIONS 
 
Q1. Write a short account on discovery of cell. 
A. Robert Hooke in 1665 observed slices of cork under a simple microscope. He noticed 
partitioned boxes or compartments in the cork slice. These boxes appeared like a honey-
comb. Hooke coined the term ‘cell’ for each box. 
 
Q2. Why is cell called the basic structural unit of life? 
A.All living beings are made up of cells. Cell is the smallest living entity performing all 
life processes. 
 
Q3. What is a cell? 
A. Cell is the basic structural and functional unit of life. 
 
Q4. What are cell organelles? 
A. They are the small compartments in the cell specialized in their activities. E.g., 
chloroplast, mitochondria, vacuole. 
 
Q5. Name the smallest and the largest living cell. 
A. Smallest cell- bacteria largest cell- ostrich’s egg 
 
Q6. Cells vary in shape. Justify this statement by drawing three different cells of different 
shapes. 
A. 
A 
 
Q7. Differentiate between:- 
1. Unicellular and multicellular organisms 
 
UNICELLULAR ORGANISM MULTICELLULAR ORGANISM 
1. organisms made up of single cell 1. Organisms made up of many cells. 
2. All the life processes are done within the 
single cell 
2. Such life processes are performed by 
specialised tissues 
 
2. Cell wall and cell membrane 
 
CELL WALL CELL MEMBRANE 
1. It is present only in plant cells. 1. It is present in both plants and animal 
cells. 
2. It provides protection against various 
natural pressures. 
2. It controls the entry and exit of various 
material 
3. It provides rigidity to the shape of the 
cell. 
3. It provides shape to plant and animal 
cells. 
 
3. plant cell and animal cell 
PLANT CELL ANIMAL CELL 
1. Cell wall is present. 1. Cell wall is absent. 
2. Plastid  are present 2. Plastids are absent. 
3. Have one big, central vacuole. 3. Vacuoles are numerous and many. 
4. Nucleus is shifted to a corner. 4. Nucleus is centrally located. 
 
4. prokaryotic cell and eukaryotic cell 
 
PROKARYOTIC CELL EUKARYOTIC CELL 
1. Nucleus is not well defined. 2. Nucleus is well defined with a nuclear 
membrane. 
2. Bacteria and blue green algae are 
prokaryotes. 
2. Fungi, animals, plants are all eukaryotes. 
 
 
Q8. Name the parts of the nucleus and state the function of the nucleus. 
A. Following are the parts of the nucleus:- 
1. Nuclear membrane  2. Nucleolus     
3. Chromosomes  4. Nucleoplasm 
 
Q9. What is a gene?  
A.It is the unit of inheritance, helping in transfer of characters from parents to the 
offspring. 
 
 
 
Q10. What is the function of a cell wall in plant cells? 
A.  Plant cells have cell wall which is required for additional protection against variations 
in temperature, high wind speed, etc. 
 
Q11. What are plastids?  
A. They are small coloured bodies in the cytoplasm of the plant cells. 
 
Q12. What are chloroplasts? 
A. They are the green coloured plastids having chlorophyll in them. They provide green 
colour to the plants and help in photosynthesis. 
 
Q13. Draw a well labeled diagrams of plant cell and animal cell. 
 
 
 
 
 
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