41 A small green insect that sucks plant juice is the

Aphid

42 The velocity of sound is largest in

Steel rod

43 After birth it is believed that the body is no longer able to form

Nerve cells

44 The organic nutrient with the highest calorific value is

Fat

45 The first Atomic Bomb contained two pieces of

Uranium 235

46 The most important aspect of photosynthesis is considered to be the

Conversion of radian energy into chemical energy

47 A sextant is used to measure

The height of an object

48 As the amount of water vapours in the air increases the rate at which plant transpire usually

Decreases

49 The live Polio Vaccine, which can be taken by mouth, was developed by

Albert Sabin

50 Cola seeds contain quantities of

Caffeine