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Question 1

Define cell.

Solution:
  • A cell is the smallest part of any living thing. 
  • There are many parts of a cell. 
  • Each part of a cell completes a certain function for the cell.
     

Question 2

Who discovered cell?

Solution:
Robert Hooke was the first person to discovery cell using a simple microscope.
 

Question 3

Mention the function of the following.

Solution:
Cell Membrane
  • The cytoplasm and nucleus are enclosed within the cell membrane. 
  • Cell membrane separates cells from one another. 
  • It allows the movement of materials due to its porosity.
  • Chromosomes

  • Nucleus contains thread like structure called as chromosomes. 
  • These chromosome contain genes. 
  • Genes is a unit of inheritance in living organism. 
  • Inheritances is the transfer to parental characters to the off springs.
     
  • Question 4

    Why are following important to a plant cell.
    Solution:
    (a) Cell wall
  • It gives rigidity to plant cells. 
  • Bacterial cell also has a cell wall.
  • (b) Chloroplast

  • Chloroplasts are the "site" of photosynthesis in leaves. It has a green colored pigment chlorophyll,
  • (c) Plastids

    Function

  • Pigments give fruits and vegetables an orange or red color.
     
  • Plastids also store photosynthetic products and starch.
     
  • Foods full of starch contain many plastids. Potatoes, for example, have many plastids in their cells.
    • Plastids are organelles that exist only in plant cells.
       

    Question 5

    What advantage does Amoeba derive by changing shape?

    Solution:
    The change in shape is due to formation of pseudopodia which facilitates movement and help in capturing food.
     

    Question 6

    What is a tissue?

    Solution:
    A group of similar cells forming special functions is called tissues.




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