31 The changes that occur in a plant community over a period of a few centuries are usually called

Succession

32 Largest glands in the human body is

Pancreas

33 Habits are

Acquired automatic acts

34 A rocket works on the principle of

Conservation of Linear Momentum

35 Substances usually present in largest amount in ordinary food are

Carbohydrates and proteins

36 Substances in the blood that neutralizes the effect of certain foreign materials are called

Antibodies

37 The pituitary gland is located in the

Head

38 The approximate number of Red Blood Cells which are formed and destroyed everyday is

200,000,000,000

39 Normally the pulse rate is the same as

The vein beats

40 A pendulum of length 1 m has a period of 2 seconds. The period of pendulum of length 2 m is

2.8 seconds