Cornea is the avascular, transparent covering of the anterior chamber of the eye. It is a highly vascularised organ.

Correct answer. Ceruminous glands (wax glands) are found in the external ear cavity. They secrete ear wax (cerumen). Cutaneous glands are found in the skin of mammals. Their secretion helps lubricate the root of hair. Sudorific glands are found in the skin of mammals. They secrete sweat to cool the body. Sebaceous glands are found in the skin of mammals. They secrete oily substance to lubricate base of hair.  

This is the correct option. Gustatory receptors are present in the tongue to detect taste.

This is the correct option. 

Option (1) is correct. Vision in dim light, and black and white vision is possible by rod cells.

The vibrations are amplified several times by three bones (hammer, anvil and stirrup) in the middle ear.

Back of the tongue helps detect bitter taste as in the case of tasting bitter gourd.

The front part of the tongue detects sweet and salty taste of any food item.

Food having sour taste is diagnosed by buds present on the left and right sides of the tongue.

The transparent and projected front part of sclera is cornea. 

Eye cells receive nutrients and oxygen from blood flowing through the minute blood vessels in choroid.

 There are two tear glands present in each of our upper eyelids.

The thin membrane at the end of the auditory canal is called tympanic membrane.

In the inner ear, the pressure variations are turned into electrical signals by cochlea. These electrical signals are sent to the brain via auditory nerve and the brain interprets them as sound.

The outer ear is called the ‘pinna’. It collects the sound from the surroundings.

Hence, option 1 is correct.