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प्रश्न
Differentiate between: Rods and cones
उत्तर
| Rods | Cones | |
| 1 | Rods help in twilight vision. | Cones help in colour vision. |
| 2 | They have visual purple pigment called rhodopsin. | They have visual violet pigment called iodopsin |
| 3 | Rods are the photoreceptor cells of the retina that are sensitive to dim light. | Cones are the photoreceptor cells of the retina that are sensitive to bright light. |
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संबंधित प्रश्न
Draw a neat and labelled diagram of the structure of the human eye.
State whether the following statement is true or false:
The image formed on our retina is upside-down
Give the scientific names of the following parts of the eye:
a clear window at the front of the eye.
Fill in the following blank with suitable word:
The part of eye sensitive to light is...................
Fill in the following blank with suitable word:
To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made..........
What change is made in the eye to enable it to focus on objects situated at different distances? Illustrate your answer with the help of diagrams.
Refraction of light in the eye occurs at:
(a) the lens only
(b) the cornea only
(c) both the cornea and the lens
(d) the pupil
How much is our field of view:
with one eye open?
Out of animals of prey and predators, which have their eyes:
on the opposite sides of their head?
Explain clearly why, a person who has lost the sight of one eye is at a disadvantage compared with the normal person who has two good eyes.
Having two eyes gives a person:
(a) deeper field of view
(b) coloured field of view
(c) rear field of view
(d) wider field of view
Mention, where in living organism is the following located and state their main function:
Fovea centralis
What is the function of iris and the muscles connected to the lens in human eye?
Define the following:
Blind spot
Answer the following question.
Trace the sequence of events Whichoccur when a bright light is focused on your eyes.
What is a Lachrymal gland?
Write scientific reason.
The movie cannot be enjoyed if seat of a viewer is too close to the screen in the cinema.
The following figure show the change in the shape of the lens while seeing distant and nearby objects. Complete the figures by correctly labelling the diagram.
Explain the structure and functioning of Human eye. How are we able to see nearby as well as distant objects?
Write the main functional activity of the following structure.
Ciliary body and suspensory ligament
