Adjusting the focal length of the eye lens to view objects at different distances is done by:

1. Cornea
2. Iris
3. Ciliary muscles
4. Sclera

The antiseptic present in tears:

1. Iodine
2. Hydrogen peroxide
3. Lysozyme
4. Lysosome

A teacher drew the diagram of heart on the blackboard and told the students to copy it in their notebooks. Mahesh couldn’t see the diagram clearly as it appeared blurred to him.

(a) Name the defect of the eye Mahesh is suffering from.

(b) Where is the image formed in this defect?

(c) Mahesh consults an eye doctor and is prescribed suitable lenses to correct the defect. Which type of lens do his spectacles have?

Which parts of the ear are responsible for:

(a) Static equilibrium?

(b) Dynamic equilibrium?