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

The coloured portion of the eye is the ______. - Science

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Fill in the Blanks

The coloured portion of the eye is the ______.

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Solution

The coloured portion of the eye is the iris.

  Is there an error in this question or solution?

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


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.


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

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

 carries signals from an eye to the brain.  


What happens to the eye when you enter a darkened cinema hall from bright sunshine? Give reason for your answer.


 List, in order, the parts of the eye through which light passes to reach the retina.


What is presbyopia? Write two causes of this defect. Name the type of lens which can be used to correct presbyopia.


How much is our field of view: 

with one eye open?


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

on the opposite sides of their head?


Fill in the following blank with suitable word: 

 Having two eyes gives a ................field of view.


The animals called predators have:
(a) both the eyes on the sides
(b) one eye on the side and one at the front
(c) one eye on the front and one at the back
(d) both the eyes at the front


The region in the eyes where the rods and cones are located is the


Name the following:

The photoreceptors found in the retina of the eye.


Note the relationship between the first two words and suggest the suitable word for the fourth place.

Cones : Iodopsim :: Rods : ……………….


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


Mention if the following statement is true (T) or false (F) Give reason.

Short-sightedness and hyperopia are one and the same thing


Given below is a set of five parts. Rewrite them in correct sequence.
 Conjunctiva, retina, cornea, optic nerve, lens


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

retina and ……………………….


What is a lacrimal gland?


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:
Short sightedness.


Define the following:
Power of accommodation


Give the main function of the following:
Retina


Choose the correct answer.
Which one is the photoreceptor _____________


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


Draw a diagram of the human eye as seen in a vertical section and label the parts which suit the following descriptions relating to the:
(i) photosensitive layer of the eye.
(ii) structure which is responsible for holding the eye lens in its position.
(iii) structure which maintains the shape of the eyeball and the area of no vision.
(iv) anterior chamber seen in front of the eye lens.
(v) outermost transparent layer seen in front of the eyeball.


Explain the Term: Accommodation in the eye


Name the following:
The pigmented circular area seen in the eye.


What is the nature of the image that forms on the retina?


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


State the Location of: 
Lacrimal gland


Long answer question

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


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 _______.


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 scientific reason.

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


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.


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.


The larynx has fold of tissue which vibrate with the passage of air to produce sound.


Why the human eye is compared with camera?


Draw the struture of human eye and label its parts.


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


The black opening between the aqueous humour and the lens is called ____________.


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?


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


Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?


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


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.


______ is a transparent layer.


The transparent membrane that keeps the eye moist is ______.


Match the following

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

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

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

With reference to human eye, answer the following question.

What is aqueous humor?


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

Explain the role of the part of human eye responsible for power of accommodation of human 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 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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