Practice MCQ Questions and answers on Biology-GK

Study of nose and alfactory organs is called Rhinology.

The size of the pupil is controlled by the activities of two muscles: the circumferential sphincter muscle found in the margin of the iris, innervated by the parasympathetic nervous system: and the iris dilator muscle, running radially from the iris root to the peripheral border of the sphincter.

Noise is a level of sound beyond the capacity of ears. Normal level of sound for conversation is 60 decibels and lawn mower is 90 decibels that can not harm the ears but very high levels of noise (at or above 120 decibels) exposure can leads to hearing loss. Noise-induced hearing loss is irreversible, the main form of treatment is prevention.

Myopia is connected with eyes.

Human beings hearing range is 20 to 20,000 Hz.

The temporal lobe contains the primary auditory cortex, which receives auditory information from the ears and secondary areas, and processes the information so we understand what we're hearing (e.g. words, laughing, a baby crying).

Cornea do not have blood vessels.

The cochlea contains the spiral organ of Corti, which is the receptor organ for hearing.

An image is formed on the retina with light rays converging most at the cornea and upon entering and exiting the lens. Rays from the top and bottom of the object are traced and produce an inverted real image on the retina.

A colour blind person has difficulty in distinguishing green & red colours.