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NCERT Solutions for Class 8th Science

 

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Chapter 8. Cell - Structure and functions

Additional Questions With Solutions

 

 

 

CELL, STRUCTURE AND FUNCTION

Ques: What is cell?  

Ans: The structural and functional unit of the living organism is called cell.

Ques: Name the instrument by which cell can be seen.

Ans: Microscope.

Ques: What is unicellular organism?

Ans: The organism which is made of only one cell that is called unicellular organism. Ex – amoeba and paramecium.

Ques: What are multi cellular organisms?

Ans: The organism which is made of more than one cell are called multi cellular organism. Ex – human and tree.

Ques:Which part of the cell contains organelles?

Ans: Cytoplasm.

Ques:Distinguish between plant cell and animal cell.

Ans:

         Plant cell

         Animal cell

  1. cell wall is present in it.
  2. chloroplast is present.
  3. Nucleus membrane is absent.
  1. Cell wall is absent in it.
  2. chloroplast is absent.
  3.  Nucleus membrane is present.

 

Ques: Name the projection in amoeba by which it take food.

Ans: Pseudopodia.

Ques:What is tissue?

Ans: A tissue is a group of similar cells having a specific function.

Ques:What are the basic components of a cell?

Ans: The basic components of a cell are cell membrane, cytoplasm and nucleus.

Ques:Name the components of cell which are enclosed within the cell membrane.

Ans: Cytoplasm and nucleus.

Ques:State the difference between eukaryotes and prokaryotes.

Ans: The difference between eukaryotes and prokaryotes:

   

      Eukaryotes

         Prokaryotes

  1. The organisms which cells have a nuclear membrane are called eukaryotes.
  2. Ex. Onion and other animals’ cells.

 

  1. The organisms which cells do not have nuclear membrane are called prokaryotes.
  2. Ex. Bacteria, blue green algae.

 

 

 

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