Which of the following is an example of diffusion of gases?

Which one of the following organ is affected by Malaria?

A yellow dust appears on the fingers, whenever we touch the middle of a flower. These tiny yellow grains are one of the most precious substances in nature because they contain the secret of plant life.  What is this dust called?

Hydroponics is growing plant without____.

Which food group is richest in energy in terms of kCal per gram?

In what form is phosphate found in bones?

Which law of physics states that the force between the two electric charges reduces to a quarter of its former value when the distance between them is doubled?

Light year is a unit of