The unit of a scale used to measure the level of acidity or alkalinity of chemicals is called:

Types of pheromone which motivate the insects to follow each other is known as________?

If in a river the flood rises and falls suddenly due to storm rain, then such river is called ________?

The slow process by which new types of organisms arise from existing forms by genetics variation is called________?

Tyndallization is more reliable than________?

A pipe flowing full, the liquid particles in the pipe has maximum velocity at ________?