11 Cellulose is the chief constituent of
Ans Cell wall
12 The percentage of carbon dioxide in the air that we exhale is
Ans 4%
13) Who made the accurate model of D.N.A structure
Ans J.D. Watson and F. Crick
14 What is the plasma membrane of eukaryotic cells made up of
Ans Phospholipid
15) What is the number of chromosome in a cell of the human body
Ans) 46
16) What is the substance to be found in the cells of a human being
Ans Protein
17) What is the basic difference between a plant cell and animal cell
Ans) Cell wall
18) Mitochondria is the centre of
Ans) Cell respiration
19) If the diameter of a cell is doubled, the level of water in it will be
Ans) Half
20) What is called the powerhouse of the cell
Ans) Mitochondria
