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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
Name the part of our eyes which helps us to focus near and distant objects in quick succession.
Fill in the following blank with suitable word:
The iris controls the amount of................entering the eye.
Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside?
Which parts of the eye cause rays of light to converge on the retina?
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Cones : Iodopsim :: Rods : ______.
State the main functions of the following:
Coronary Artery
Complete the paragraph by choosing the right options given below.
(minimum, near point, 25 cm, farthest, farthest distance, far point)
The _______ distance of an object from a normal eye, at which it is clearly visible without stress on the eye, is called the minimum distance of distinct vision. The position of the object at this distance is called the _______ of the eye, for a normal human eye, the near point is at _______. The _______ distance of an object from a human eye, at which it is clearly visible without stress on the eye is called _______ of distinct vision. The position of the object at this distance is called the _______ of the eye.
The muscular diaphragm that controls the size of the pupil is ____________.
Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?
Where is the following located?
Yellow spot
