Advertisements
Advertisements
Question
Choose the Odd One Out:
Options
Rods
Cones
Night blindness
Rhodopsin
Solution
Cones
APPEARS IN
RELATED QUESTIONS
Compare the following: Choroid and retina
The region of the vertebrate eye, where the optic nerve passes out of the retina, is called the
(a) fovea
(b) iris
(c) blind spot
(d) optic chaisma
A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads :
Left eye : +2.50 D
Right eye : +2.00 D
Which lens bends the light rays more strongly?
What kind of lens is present in the human eye?
Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside?
There are two types of light-sensitive cells in the human eye:
Where are they found?
Name the cells on the retina of an eye which are sensitive to (i) bright light (ii) dim light (iii) sensation of colour.
Suggest how your irises help to protect the retinas of your eyes from damage by bright light.
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Cones : Iodopsim :: Rods : ______.
Label the following diagram :
Give the main function of the following:
Retina
Draw a diagram of the human eye as seen in a vertical section and label the parts which suit the following descriptions relating to the:
(i) photosensitive layer of the eye.
(ii) structure which is responsible for holding the eye lens in its position.
(iii) structure which maintains the shape of the eyeball and the area of no vision.
(iv) anterior chamber seen in front of the eye lens.
(v) outermost transparent layer seen in front of the eyeball.
Name the following:
The part of the eye responsible for change in the size of the pupil.
Shylesh is a school-going kid studying standard VIII. He is crazy about playing video games on mobile phones. After a couple of months, his eyes turned red and he felt severe pain in his eyes. His science teacher enquired about this and advised his parents to take him to an eye doctor.
- How does excessive usage of mobile phone affect our eyes?
- What are the values shown by the teacher?
Explain the structure and functioning of Human eye. How are we able to see nearby as well as distant objects?
Given below is a diagram depicting a defect of the human eye. Answer the questions that follow:
- Give the scientific term for the defect.
- Mention one possible reason for the defect.
- What type of lens can be used to correct the defect?
Match the following:
|
Column - I |
Column - II | ||
| 1 | Retina | a | Path way of light |
| 2 | Pupil | b |
far point comes closer |
| 3 | Ciliary muscles | c |
near point moves away |
| 4 | Myopia | d | Screen of the eye |
| 5 | Hypermetropia | e | Power of accommodation |
State the functions of the following:
Ciliary muscles
The thin, transparent extension of sclerotic layer found in front of the lens is ______.
