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प्रश्न
What are rods and cones in the retina of an eye? Why is our night vision relatively poor compared to the night vision of an owl?
उत्तर
Rods and cones are the light-sensitive cells in the retina of the eye.
Rods (rod-shaped cells) present in the retina are sensitive to dim light and are vital for vision at night. Humans have a very small number of rod cells in their retina compared with nocturnal animals, such as owls, which have a relatively large number of rod cells in their retina. Hence, human vision is relatively poor compared with the vision of owls, which can see objects at night.
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संबंधित प्रश्न
Distinguish between: blind spot and yellow spot
What is the least distance of distinct vision for a normal human eye?
Fill in the following blank with suitable word:
To bring light from a near object to a focus on the retina of the eye, the convex eye-lens need to be made....................
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To what is each type of cell sensitive?
The human eye possesses the power of accommodation. This is the power to:
(a) alter the diameter of the pupil as the intensity of light changes
(b) distinguish between lights of different colours
(c) focus on objects at different distances
(d) decide which of the two objects is closer.
An object is moved closer to an eye. What changes must take place in the eye in order to keep the image in sharp focus?
Correct and rewrite the statements by changing the biological term that is underlined for the statement:
The part of the eye which can be donated from a clinically dead person is the Retina.
Name the following:
The region in the eye where the rods and cones are located.
Mention, if the following statement is True or False
Rods are responsible for vision in the dark
With reference to human eye answer the question that follow:
Name the part of the eye associated with the regulation of the shape of lens.
