Which of the following structure is responsible for monochromatic vision?A) ScleraB) RetinaC) ConesD) RodsE) Pupil

The structure responsible for monochromatic vision is D) Rods.

Here's a step-by-step explanation:

1. The human eye has two types of photoreceptor cells: rods and cones.

2. Cones are responsible for color vision and function best in relatively bright light. They are most sensitive to one of three different colors (blue, green, and red), and hence, they are not involved in monochromatic vision.

3. Rods, on the other hand, are responsible for vision in low light conditions. They do not mediate color vision, and thus provide a monochromatic view of the world.

4. Therefore, the structure responsible for monochromatic vision is the rods.

The other options listed - sclera, retina, and pupil - are parts of the eye but they do not directly contribute to monochromatic vision. The sclera is the white part of the eye, the retina is the layer at the back of the eyeball containing cells that are sensitive to light, and the pupil is the opening in the iris through which light enters the eye.