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

The transparent membrane that keeps the eye moist is ______. - Science

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The transparent membrane that keeps the eye moist is ______.

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Solution

The transparent membrane that keeps the eye moist is conjunctiva.

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RELATED QUESTIONS

Compare the following: Choroid and retina


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?


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


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.


Fill in the blanks in the following.

Night birds have _________ cones than rods in their eyes.

 


Draw a labelled sketch of the human eye.


Describe the anatomy of the human eye.


Explain the mechanism of vision.


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
  (c) Converging power of eye lens becomes high

Name the part of the eye: 

which controls the amount of light entering the eye. 


Name the part of the eye: 

 which changes the focal length of eye-lens.

 


How does the eye adjust to take account of an increase in brightness?


Name the part of the retina which is insensitive to light.


Give the scientific names of the following parts of the eye: 

a hole in the middle of the iris.  


Fill in the following blank with suitable words: 

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


 How does this affect the amount of light entering the eye?


The descriptions of five kinds of images are given below:
(a) diminished and virtual
(b) enlarged and real
(c) enlarged and erect
(d) real and inverted
(e) virtual and the same size
Which one of these describes the image formed:
(i) on the retina of the eye?
(ii) by a magnifying glass?
(iii) by a convex driving mirror on a car?
(iv) by a plane mirror?
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Suggest how your irises help to protect the retinas of your eyes from damage by bright light.


Out of animals of prey and predators, which have their eyes: 

on the opposite sides of their head?


Name the following:

The photoreceptors found in the retina of the eye.


Mention, where in living organism is the following located and state their main function:
Fovea centralis


Given below is certain structure. Write against them its functional acivity.

retina and ……………………….


Give scientific reason:
One can sense colours only in bright light.


Give scientific reason:

We cannot clearly see an object kept at a distance less than 25 cm from the eye.


What is the function of iris and the muscles connected to the lens in human eye?


Write whether the following is true or false:
Rods are the receptor cells in the retina of the eye sensitive to dimlight.


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Rods are receptor of ______________


The figure below compares a part of our eye with a part of a photographic camera.

Explain the mode of working and the functions of the parts of the eye mentioned above.


Sketch and label V.S. of a human eye.


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


Name the following:
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Name the following:
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State the Location of: 
Lacrimal gland


State the Function:
Cornea


State the Function:
Conjunctiva


State the Function:
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Complete the following sentence with appropriate Word
The part of the human eye where rod cells and cone cells are located is the:


Complete the following sentence with appropriate Word
The photoreceptor cells of the retina sensitive to colour are:


Complete the following sentence with appropriate Word
The aperture in the eye through which light enters is the:


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.


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 _______.


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The part of human eye that transmits electrical signals to the brain.


Write the name.

The ability of lens to adjust the focal length as per need is


Write the name.

The fleshy screen behind cornea.


Write the name.

The screen with light sensitive cells in human eye.


The image of an object at an infinite distance is obtained in a real and erect form through a convex magnifying glass.


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


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Write an Explanation.

Farthest distance of distinct vision


Write an Explanation.

Power of accommodation


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The movie cannot be enjoyed if seat of a viewer is too close to the screen in the cinema.


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Write the function of the human eye and label parts of the figure given below.


Complete the paragraph by choosing the right options given below.

(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.


______ is tough and thick white sheath that protects the inner parts of the eye.


______ is the structural and functional unit of living organisms.


Why the human eye is compared with camera?


Draw the struture of human eye and label its parts.


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.

  1. How does excessive usage of mobile phone affect our eyes?
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In a myopic eye, the image of the object is formed


A tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in the figure as A, B, C and D. In which position mirror will be visible?

(A) (B)  (C) (D)

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


In the figure of the human eye, the cornea is represented by the letter


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


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Which part of the eye gets affected if someone is suffering from cataract? How is it treated?


Write down the names of parts of the eye in the blank spaces shown in the figure.


______ of the eye is comparable to the film of a camera.


The coloured portion of the eye is the ______.


Match the following

1. Conjunctiva a. Coloured part of eye
2. Cornea b. Photosensitive layer
3. Iris c. Refraction
4. Retina d. Protection

What is ‘white of the eye’?


Describe the parts in the external structure of the eye.


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Select the option with incorrect identification:


Which cells of the retina enable us to see coloured objects around us?


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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

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

With reference to human eye, answer the following question.

What is blind spot?


With neat, labeled diagram describe the structure of retina of eye.


Match the following:

Column - I Column - II
1. Retina a. Pathway 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 f. Power of accommodation

Match the following:

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

far point comes closer

3 Ciliary muscles c

near point moves away

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5 Hypermetropia e power of accommodation

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 accomodation

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

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

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