170) The most complex of all matter are
a) earth
b) atom
c) organism
d) water
171) Only six bio-elements (O, C, H,N, Ca & P) make ………. % of protoplasm.
a) 65
b) 80
c) 99
d) 98
172) Percentage composition of Oxygen (by mass) in organism is:
a) 65
b) 80
c) 99
d) 98
173) Percentage composition of Carbon (by mass) in organism is:
a) 65
b) 18
c) 55
d) 28
174) Percentage composition of Hydrogen(by mass) in organism is:
a) 15
b) 05
c) 20
d) 10
175) Percentage composition of Nitrogen (by mass) in organism is:
a) 6
b) 3
c) 9
d) 8
