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

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

Advertisements
Advertisements
Match the Columns

Match the following

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

Solution

1. Conjunctiva d. Protection
2. Cornea c. Refraction
3. Iris a. Coloured part of eye
4. Retina b. Photosensitive layer
  Is there an error in this question or solution?

RELATED QUESTIONS

Write the function of retina in human eye.


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


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: 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.

 


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

The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D 

 Which is the weaker eye?


What is the name of: 

 the curved, transparent front surface of the eye?


Where is the image formed in a human eye?


What is the function of the lens in the human eye? 


Name that part of the eye which is equivalent to the photographic film in a camera.


A person walking in a dark corridor enters into a brightly lit room: 

 State the effect on the pupil of the eye. 


 If you walk from a dark room into sunlight and back again into dark room, how would your pupils alter in size? What makes this happen?


To focus the image of a nearby object on the retina of an eye:
(a) the distance between eye-lens and retina is increased
(b) the distance between eye-lens and retina is decreased
(c) the thickness of eye-lens is decreased
(d) the thickness of eye-lens is increased 


Name two animals having eyes: 

 one the sides of the head.


Mention if the following statement is true (T) or false (F) Give reason.
Sometimes medicines dropped into the eyes come into the nose and even throat


Sometimes you remember a vivid picture of a dream you saw. What is the role of your eyes in this experience?


With reference to the functioning of the eye, answer the question that follow:

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


With reference to the functioning of the eye, answer the question that follow:

Name the cells of the retina and its respective pigments which get activated in the light.


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.


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?


State the main functions of the following:
Seminal Vesicles  


Name the following:
The opening through which light enters the eyes.


Choose the correct answer : 
The rods and cones of a vertebrate retina function is to _________


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


What is meant by power of accommodation of the eye?


Differentiate between:

Retina and Choroid.


Name the following:
The region in the eye where the rods and cones are located.


Name the following:
The type of lens used for correcting myopia.


Give Technical Term:
Name the part of the retina on which an object is focused for the clearest vision.


Give Technical Term:
The adjustment of the eye in order to obtain a clear vision of objects at different distances


State the Function:
Visual purple


 Choose the Odd One Out: 


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.


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

  1. Name the type of lens in the human eye.
  2. Name the screen at which the maximum amount of incident light is refracted?
  3. State the nature of the image formed of the object on the screen inside the eye.

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 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 the object in the human eye is formed on the cross screen.


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.


Vision defect that increases distance between the lens of the eye and retina of the eye is termed as myopia.


Write an Explanation.

Minimum distance of distinct vision


Write an Explanation.

Farthest distance of distinct vision


Write an Explanation.

Power of accommodation


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.


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.


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?
  2. What are the values shown by the teacher?

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


The pigmented circular area seen in front of the eye:


Given below is a diagram depicting a defect of the human eye. Answer the questions that follow:

  1. Give the scientific term for the defect.
  2. Mention one possible reason for the defect.
  3. What type of lens can be used to correct the defect?

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.


Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?


What kind of lens is there in our eyes? Where does it form the image of an object?


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 ______.


The transparent membrane that keeps the eye moist is ______.


What is ‘white of the eye’?


Describe the parts in the external structure of the eye.


Which one of the following statements is NOT correct? 


Select the option with incorrect identification:


The innermost layer of human eye is ______.


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 aqueous humor?


With reference to human eye, answer the following question.

What is blind spot?


Vitreous humour is present between ______.


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

4 Myopia d screen of the eye
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

Share
Notifications



      Forgot password?
Use app×