NEET2017ZoologyNeural Control and CoordinationActual
Which of the following statement is coorect? (i) The rods contain a purplish-red protein called the rhodopsin. (ii) The photopigments are embedded in the membrane discs of the inner segment. (iii) Retinal is a derivative of vitamin A. (iv) Light induces dissociation of the retinal from opsin resulting in changes in the structure of the opsin.
Options
- A(i) and (ii)
- B(i), (iii) and (iv)
- C(i) and (iii)
- D(ii), (iii) and (iv)
Correct answer
B. (i), (iii) and (iv)
Step-by-step solution
The inner layer of an eye is the retina, and it contains three layers of neural cells — from inside to outside — ganglion cells, bipolar cells and photoreceptor cells. There are two types of photoreceptor cells, namely, rods and cones. These cells contain the light-sensitive proteins called the photopigments. The daylight (photopic) vision and colour vision are functions of cones and the twilight (scotopic) vision is the function of the rods. The rods contain a purplish-red protein called the rhodopsin