Deficiency of which of the following causes non-clotting of blood?

• Vitamin C

• Vitamin K

• Vitamin E

• Vitamin B₁₂

Addition of excessive amounts of heat to lake is referred to as

The mercury and sodium street lamps light up because of

From the national point of view which of the following indicates Micro Approach?

Competition for food, light and space is most severe in

The green colour seen in firework displays is due to the chloride salt of

Kautilya's 'Artharshastra' mainly deals with

Rainbows are produced by when sunlight 

Which of the following is used in pencils?

The branch of medicine involving synthetic chemical compounds is

Bubbles of air rise up through liquids due to