Tamil Nadu Board of Secondary EducationSSLC (English Medium) (5 to 8) Class 8

______ is a transparent layer. - Science

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MCQ
Fill in the Blanks

______ is a transparent layer.

Options

  • Sclera

  • Cornea

  • Choroid

  • Retina

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Solution

Cornea is a transparent layer.

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RELATED QUESTIONS

Draw labelled diagrams of the following: Eye


Write short notes on the following: Retina 


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?


Explain the following:

Mechanism of generation of light-induced impulse in the retina.


Differentiate between: Rods and cones


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


Distinguish between: aqueous humor and vitreous humor


Distinguish between: blind spot and yellow spot


Which. of the following has normal vision?

(a) Xc Xc
(b) Xc Y
(c) XC Xc
(d) Xc Yc


Myopia is an example of ______.


Fill in the blanks in the following.

The size of the pupil becomes ________ when you see in dim light.


Draw a labelled sketch of the human eye.


Describe the anatomy of the human eye.


Draw a neat and labelled diagram of the structure of the human eye


Match the following:

Column I Column II
(i) Myopia (a) Converging power of eye lens becomes low
(ii) Hypermetropia (b) Converging power of eye lens remains the same
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Left eye : −4.00 D 

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Name the part of our eyes which helps us to focus near and distant objects in quick succession.


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 a clear window at the front of the eye.  


Fill in the following blank with suitable words: 

When light is dim, the pupil becomes................   


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Name the two structure in the eye responsible for bringing about the change in the shape of the lens.


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Give scientific reason:

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Draw a labeled diagram of the front view of human eye.


Explain the Term: Accommodation in the eye


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Name the following:
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Long answer question

Draw the neat labelled diagram of the Sectional view of the human eye.


For the normal human eye, the near point is at ___________ cm.


Draw a scientifically correct labelled diagram of a human eye and answer the questions based on it:

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A small hole of changing diameter at the centre of Iris is called _______.


For a normal human eye the near point is at _______.


In a relaxed state, the focal length of healthy eyes is _______.


Write the name.

The fleshy screen behind cornea.


Write the name.

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For a healthy human eye, the distant point is infinite distance.


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Write an Explanation.

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Farthest distance of distinct vision


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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.


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(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.


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  2. What are the values shown by the teacher?

In a myopic eye, the image of the object is formed


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Reason: There are no rods or cones present at the junction of the optic nerve and retina in the eye.


The pigmented circular area seen in front of the eye:


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(A) (B)  (C) (D)

Which of the following statements is correct regarding rods and cones in the human eye?


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Name the part of the eye which gives colour to the eyes.


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Column - I Column - II
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2. Pupil b. Far point comes closer
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With neat, labeled diagram describe the structure of retina of eye.


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Column - I Column - II
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4. Myopia d. Screen of the eye
5. Hypermetropia f. Power of accommodation

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  Column - I   Column - II
1 Retina a  pathway of light
2 Pupil b

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near point moves away

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5 Hypermetropia e power of accommodation

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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 accomodation

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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
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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

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