The best kind of optical microscope can magnify objects up to about:

• 400 times

• 4000 times

• 300 times

• 3000 times

Function of mitochondria in a cell is :

• produce energy

• produce protein

• movement of particles

• cell division

These cells carry oxygen around the body in the blood:

• nerve cells

• red blood cells

• palisade cells

• white blood cells

The length of the nerve cell is approximately:

• 4 metre

• 3 metre

• 2 metre

• 1 metre

Which two parts of the eye are transparent?

• cornea & conjuctiva

• cornea & iris

• iris & pupil

• choroid & retina

Thickness of the lens is controlled by the :

• choroid

• conjuctiva

• ciliary muscles

• suspensory ligaments

Which vitamin is prepared by the outer layer of the skin?

• vitamin A

• vitamin B

• vitamin C

• vitamin D

Which one of the following is an example of suspension?

• slurry

• salt in water

• ethanol in water

• sugar in water

A substance that dissolves while forming a solution is called:

• solvent

• solute

• insoluble

• mixture

Which one of the following chemical is used as an antifreeze?

• ethene

• ethyne

• ethylene glycol

• glycerol