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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
Answer briefly:
How do you perceive the colour of an object?
How does the eye regulate the amount of light that falls on the 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
What is the principal function of the eye-lens?
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 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?
How much is our field of view:
with one eye open?
Name the following:
The photoreceptors found in the retina of the eye.
Choose the correct answer :
The rods and cones of a vertebrate retina function is to _________
Name the following:
The innermost layer of the eye
Mention, if the following statement is True or False
Rods are responsible for vision in the dark
State the Function:
Conjunctiva
Choose the Odd One Out:
Draw a scientifically correct labelled diagram of a human eye and answer the questions based on it:
- Name the type of lens in the human eye.
- Name the screen at which the maximum amount of incident light is refracted?
- State the nature of the image formed of the object on the screen inside the eye.
Draw the struture of human eye and label its parts.
When light rays enter the eye, most of the refraction occurs at the ____________.
Which of the following statements is correct regarding rods and cones in the human eye?
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 |
Write the main functional activity of the following structure.
Ciliary body and suspensory ligament
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.
