71 Carbon dating is scientific process for determining the

Age of an object

72 A gas has neither definite shape nor

A definite volume

73 Cryogenics is the study of

Behaviour of metals at extremely low temperature

74 If a brass ring is heated, its diameter will

Increase slightly

75 We can see objects because they

Reflect light

76 Insectivorous plants grow in the soil which is deficient in

Nitrates

77 Which Vitamin is most easily destroyed by heat and air?

Vitamin C

78 Bacteria reproduce by rapidly by cell division as often as one in

20 Minutes

79 As the amount of glycogen in the liver decreases, the amount of glucose in the blood usually

Increases

80 A full set of permanent teeth consist of

32 teeth