How many types of photoreceptor cells are present in the retina?
A. Two
B. Three
C. Four
D. Five
Answer:A
How many types of photoreceptor cells are present in the retina?
A. Two B. Three C. Four D. Five
Explanation: There are two types of photoreceptor cells, namely, rods and cones. These cells contain the light-sensitive proteins called the photopigments. Daylight vision is the function of cones and twilight vision is the function of rods.