The type of microscope that we use in our school laboratories is :

1. Simple microscope
2. Electron microscope
3. Compound microscope
4. Both (1) and (2)

Which of the following lens is used in a simple microscope ?

1. A single biconcave lens
2. Two convex lenses
3. A single biconvex lens
4. Two concave lenses

The outermost layer of the cell is known as :

1. Cytoplasm
2. Protoplasm
3. Epidermis
4. Plasma membrane

The definite number of chromosomes in the cells of a human body is :

1. 23 pairs
2. 23
3. 46 pairs
4. 32