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प्रश्न
Give reason:
Blind spot is considered as 'area of no vision'.
उत्तर
- The blind spot is considered an 'area of no vision' because there are no sensory cells.
- This is the point at which the nerve fibres from all the sensory cells of the retina converge and bundle together to leave the eyeball as the optic nerve.
संबंधित प्रश्न
Distinguish between: blind spot and yellow spot
Name the part of the eye:
which controls the amount of light entering the eye.
Name the part of the retina which is insensitive to light.
What is the least distance of distinct vision for a normal human eye?
What is the:
far point of a normal human eye?
The human eye forms the image of an object at its ______.
Which of the following controls the amount of light entering the eye?
(a) ciliary muscles
(b) lens
(c) iris
(d) cornea
Which parts of the eye cause rays of light to converge on the retina?
When is a person said to have developed cataract in his eye? How is the vision of a person having cataract restored?
The figure below compares a part of our eye with a part of a photographic camera.
Name the corresponding parts of the eye the camera shown here that are comparable in function.
We see advertisements for eye donation on television or in newspapers. Write the importance of such advertisements.
Choose the correct answer :
The rods and cones of a vertebrate retina function is to _________
What are the functions of tears?
State the Function:
Conjunctiva
A small hole of changing diameter at the centre of Iris is called _______.
Assertion: Blind spot is a small area of the retina which is insensitive to light where the optic nerve leaves the eye.
Reason: There are no rods or cones present at the junction of the optic nerve and retina in the eye.
Arrange and rewrite the term in group in correct order to be in a logical sequence, beginning with the term that is underlined:
Pupil, Aqueous humour, Retina, Vitreous humour.
Match the terms in column I with those in column II and write down the matching pairs.
| Column I | Column II | ||
| (i) | Conjunctiva | (a) | Viral infection |
| (ii) | Cornea | (b) | Ciliary body |
| (iii) | Choroid | (c) | Spiral-shaped |
| (iv) | Cochlea | (d) | Transparent epithelium |
| (v) | Conjunctivitis | (e) | Suspensory ligament |
| (f) | Contains melanin | ||
| (g) | Transparent but appears black |
With reference to human eye answer the question that follow:
Name the part of the eye associated with the layer providing nourishment to the eye.
