Question : Cockroach cannot survive in the water because its respiratory organ is:

Option 1: gill

Option 2: trachea

Option 3: book lung

Option 4: pulmonary sac

Question : Air bladder in fish acts as:

Option 1: Accessory respiratory organ

Option 2: Hydrostatic organ

Option 3: Both acessory respiratory organ and hydrostatic organ

Option 4: Primary respiratory organ

Question : The largest reservoir of fresh water is:

Option 1: Glaciers

Option 2: Ground water

Option 3: Ponds

Option 4: Lakes

Question : A mixture of 70 litres of wine and water contains 10% of water. How much water must be added to make the water $12 \frac{1}{2}\%$ of the resulting mixture?

Option 1: 5 litres

Option 2: 3 litres

Option 3: 2 litres

Option 4: 4 litres

Question : If water is frozen to become ice, its volume is increased by 10%, then if the ice is melted to water again, its volume will be decreased by:

Option 1: $9$%

Option 2: $9\frac{1}{11}$%

Option 3: $8$%

Option 4: $9\frac{1}{2}$%

Question : Why boiling point of water decrease at high altitudes?

Option 1: Because of the high temperature

Option 2: Because of low atmospheric pressure

Option 3: Because of low temperature

Option 4: Because of high atmospheric pressure