Retina

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The light sensitive screen in the human eye is called retina
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A list of steps involved in mechanism of vision is given below in a random order. (i)Neural impulses are analysed and image formed on retina is recognised by visual cortex. (ii)Membrane permeability changes (iii)Ganglion cells are excited (iv)Bipolar cells are depolarised (v)Action potentials (impulse) are transmitted by optic nerves to visual cortex. (vi)Potential differences are generated in the photoreceptor cells. (vii)Light energy causes a change in shape of rhodopsin, leading to the dissociation of retina (an aldehyde of vitamin A ) from opsin (a protein) (viii)Structure of opsin is changed. Which of the following options represents these events in a correct order ?

Explain the following : (a) Role of Na^(+) in the gneration of action potential. (b) Mechanism of generation of light- induced inpulse in the retina . (c ) Mechanism through which a sound produces a nerve impulse in the inner ear .

For a normal eye, provides a converging power of 40Dand the least converging power of the eye lens behind the cornea is 20D.usingh this information, the retina and the corner eyes lens can be estimated to be

Match column I with column II and select the correct option from the codes given below. {:("Column-I","Column-II"),(A."Cornea",(i)"Provides opening for light to enter"),(B."Iris",(ii)"Transduces blue,green and red light"),(C."Lens",(iii)"Controls the amount of light that enters"),(D."Optic nerves",(iv)"Alters the shape of lens"),(E."Pupil",(v)"Transmit information to the CNS"),(F."Ciliary muscles",(vi)"Focus light directly on retina"),(G."Fovea",(vii)"Bends light and protects inner eye"):}