WBBSE Solutions For Class 10 Life Science And Environment Chapter 1 Eye As A Sense Organ In Human

Chapter 1 Eye As A Sense Organ In Human Accommodation Defects Of Vision And Corrective Measures Summary

• The eye is a human sense organ which acts as a light receptor organ and helps in vision. The structural, components of the eye are—the eyeball, protective structures and eye muscles.
• The eyeball is composed of three layers. The outer fibrous layers is composed of sclera and cornea. The middle layer is composed of the choroid containing blood capillaries, ciliary bodies, and iris. The innermost neural layer is the retina.
• It is composed of rod and cone cells. Inside the eye, there is a biconvex lens behind the iris. The eyeball has three chambers. The front chamber is located between the cornea and iris; the middle chamber is located between the iris and lens and contains aqueous humour.
• The posterior vitreous chamber, located between the lens and retina contains vitreous humour. The protective parts of the eye are the conjunctiva, eyelid and lacrimal glands. The eyeball is connected by the eye muscle inside the eye socket.
• Monocular vision is a type of vision in which one eye of the animal moves and sees objects independently of the other eye. Most preys have this type of vision.
• On the other hand, binocular vision is a type of vision where both eyes of an animal are used at the same time. Most predatory animals including humans employ this type of vision.
• The elasticity of ciliary muscle and lens helps the eye to produce the right image from different distances perfectly. This is called accommodation. Ciliary muscles change the curvature of the lens, which helps the lens to change its focal length and keep objects in focus.
• There are some important disorders related to the eyes. These are myopia (short-sightedness), hyperopia or hypermetropia (long-sightedness), and presbyopia.
• Accumulation of pigment due to the breakdown of protein in the lens causes loss of clear vision. It is called a cataract.

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Chapter 1 Eye As A Sense Organ In Human Long Answer Type Questions

wbbse class 10 life science question answer

Question 1. Describe the structure of the human eyeball and mention its function.
Or,
Describe the structure and function of the human eyeball.

Similar question, Draw a neat diagram of the vertical section of the eyeball of the human eye and label the following parts—

1. Cornea,
2. Lens,
3. Vitreous humour,
4. Retina.

Answer:

Human eyeball:

It js a spherical, fluid-filled portion of the eye. It has two types of structural components—

1. The eye coats:

The structure and function of each component of the eye coats are as follows—

1. The eye has three coats—fibrous outer coat, vascularised medial coat and neural inner coat.
2. The fibrous outer coat has two portions, its posterior 5/6th opaque portion is called the sclera and the anterior 1 /6th transparent portion is known as the cornea, the sclera is rigid that keeps the shape of the eye intact. Cornea is a refractive medium that acts as a front window of the eye.
3. The vascularised medial coat is known as choroid. It is black in colour due to the accumulation of melanin pigment. The cornea is rich in blood capillaries.
4. The anterior extension of the choroid forms the ciliary body and iris. The ciliary body is a muscular extension of the choroid that holds the lens in position. It remains attached with the suspensory ligament. The pigmented muscular extension of the choroid that is present behind the cornea is called the iris. It has a round aperture at the centre to allow light to enter the eye. This aperture is known as the pupil. Contraction and expansion of iris muscles change the diameter of the pupil to regulate the exposure on the retina.
5. The neural inner coat known as the retina is composed of two types of photosensitive cells—rod cells and cone cells. The rod cells are sensitive to dim light and the cone cells sense bright light.
6. fust opposite to the pupil, the retina has a tiny depressed spot, called the macula lutea of yellow spot. This spot contains cone cells only and is capable of creating the sharpest image in bright light. The region of the retina from which the optic nerve emerges is devoid of any photosensitive cells. Therefore, this spot is incapable of sensing light, hence it is called the blind spot.

2. Refractive medium:

The structure and function of each component of the refractive medium is as follows—

1. The refractive media of eye are—cornea, aqueous humour, lens and vitreous humour.
2. Cornea is a transparent convex layer, present in front the eye as a window glass.
3. The thin anterior chamber of eye between the cornea and the lens is filled with a watery fluid called aqueous humour.
4. Behind the iris, a transparent circular biconvex lens is present, that is held in position by suspensory ligaments and ciliary muscles. The lens creates the image on the retina.
5. The posterior chamber of the eyeball behind the lens is filled with a viscous matrix, called vitreous humour. Both aqueous and vitreous humour maintains the pressure inside the eyeball and supply nutrition to different parts of the eye.

Question 2. Mention two importance of accommodation in daily life. How does the eye accommodate to see a distant and a nearer object?

Answer:

Importance of accommodation:

Two importance of accommodation in our daily life is mentioned below.

1. While driving a car, the driver has to follow close objects like pedestrians and change over to a distant objects like traffic signals instantly.
2. While in the classroom; we look at the blackboard and the very next moment read or write something from the book or on tire paper over the desk.

Mechanism of accommodation to view distant and nearer objects:

Accommodation enables the eye to see any object from both close and long distances. The mechanism is mentioned below.

1. Seeinq a distant object:

To see a distant object, some sequential adjustments occur inside the eyeball. These are mentioned here.

Ciliary muscles relaxed → Curvature of the lens decreases → Lens becomes thin → Focal length of the lens increases →’The image is formed on the retina.

wbbse class 10 life science question answer

2. Seeing a nearer object:

To see a nearer object, following sequential adjustments occur inside the eyeball.

Ciliary muscles contract → Curvature of the lens increases → Lens becomes thick → Focal length of the lens reduces → The image is formed on the retina.

Question 3. Give a brief idea on hypermetropia.

Similar question, ‘A person can see distant objects distinctly but is unable to visualise a near object in a perfect way’—Predict what would be the probable cause and suggest the corrective measure for such problem. Write a note on the cataract.

Answer:

Hypermetropia:

Hypermetropia is a visual impairment in which a person can see any distant object but is unable to find the nearer objects clearly.

1. Characteristic feature:

In this disease, the diameter of the eyeball becomes anteroposteriorly compressed or the cornea becomes too much flattened. As a result, the image is formed beyond the retinal surface. So the patient finds a blurred image of the nearer objects.

2. Remedy:

To rectify hypermetropia, ophthalmologists recommend (+ve power) a convex glass lens. This glass lens creates an image on the retinal surface and makes the vision clear.

Cataract:

Usually due to ageing, deficiency of certain proteins in the eye lens makes it opaque. This condition is called cataracts.

1. Characteristic feature:

The opacity of the lens increases gradually to make the vision blurred.

2. Remedy:

To solve the problem of cataracts, an eye surgeon can replace the defective lens with a synthetic plastic lens by surgical procedure.

wbbse class 10 life science question answer

Question 4. Write a brief note on myopia. What do you know about presbyopia?

Answer:

Myopia:

Myopia is a visual impairment, in which a person can see nearer objects clearly but is unable to see distant objects.

1. Characteristic feature:

In this disease, the diameter of the eyeball becomes anteroposteriorly enlarged or the cornea is too much curved. As a result, the eyeball becomes elliptical, and the image is formed ahead of the retinal surface.

Therefore, the patient views a blurred image of the distant object.

2. Remedy:

To rectify myopia, ophthalmologists recommend a (-ve power) concave glass lens. This glass lens creates an image on the retinal surface and makes the vision clear.

Presbyopia:

After attaining the age of 40, most people lose the elasticity of the lens. In this situation, the accommo¬dation capacity reduces significantly. The visual impairment caused is known as presbyopia.

1. Characteristic feature:

A patient suffering from presbyopia cannot see nearer objects clearly. They face problems in reading, writing and dealing with finer tools.

2. Remedy: Presbyopia can be rectified by using the bifocal lens.

 

Chapter 1 Eye As A Sense Organ In Human Short Answer Type Questions

Question 1. What are sense organs?

Answer:

Sense organs:

The special receptor organs present in the animal body, which are capable of sensing only specific types of stimulus and transmitting the impulses to the central nervous system, are known as sense organs.

There are five sense organs, viz—ear, skin, eye, nose and tongue.

wbbse class 10 life science question answer

Question 2. Briefly describe the sclera of the eye. Mention its function.

Answer:

Sclera of the eye:

Sclera is the opaque fibrous coat, covering about 5/6 th portion of the eye from its posterior side. It is white in colour, rigid and composed of collagen fibres.

Function:

Sclera provides shape to the eye and protects it from external injuries.

Question 3. What is a choroid? Mention its function.

Answer:

1. Choroid: The melanin-rich, dark-coloured layer of the eye, that is present in between the retina and sclera is called the choroid.
2. Function: Choroid supplies nutrition to different parts of the eye. It is black, therefore, prevents reflection inside the eyeball and absorbs undesired rays.

Question 4. Where is the retina located? Mention its function.

Answer:

1. Location: Retina is located on the inner back wall of the eye.
2. Function: Retina receives the visual stimulation by its photosensory cells and sends the visual impulse to the brain.

Question 5. Briefly describe the lens of human eye. Mention its function.

Answer:

Similar question, Mention one function of lens of the human eye.

The lens of the human eye:

It is a transparent, biconvex, elastic structure located behind the iris. It remains suspended steadily by suspensory ligaments behind the pupil of the eye.

Function:

The lens creates an image on the retina by the refraction of incident rays of light entering in to the eye.

wbbse class 10 life science question answer

Question 6. Briefly describe the cornea. Mention its function.

Answer:

Cornea:

The cornea is the 1 /6th portion of the fibrous protective layer of eye. It is a convex, transparent refractive layer present in front of the eye.

function:

Cornea acts as a refractive medium to allow light to enter in to the eye. It operates as a condenser of incident light.

Question 7. What is a yellow spot? Mention its function.

Answer:

Yellow spot:

The spot-on retina just opposite to the pupil is highly rich in cone cells. This spot is capable of receiving the brightest and most piominent image of any object. This region is known as macula densa or yellow spot.

Function:

The yellow spot is the portion of the eye that is specialised for seeing things with maximum clarity.

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Question 8. What is fovea centralis?

Answer:

Fovea centralis:

The centre of a yellow spot on the human retina has a tiny depression that contains only cone cells. This region of the retina is called the fovea centralis.

Question 9. What is blind spot?

Answer:

Blind spot:

The spot on the retina, from which the optic nerve emerges and has no photosensitive cells. Therefore, this spot does not receive any stimulus from light. This spot on the retina is known as a blind spot.

Question 10. What is aqueous humour? Mention its function.

Answer:

Aqueous humour:

Aqueous humour is the transparent watery medium that is present in the anterior chamber of the eye in between the cornea and the lens.

Function:

Aqueous humour is a refractive medium of the eye that maintains internal pressure of the anterior chamber and provides nutrition to different parts of it.

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Question 11. What is vitreous humour? Mention its function.

Answer:

Vitreous humour:

Vitreous humour is the transparent viscous medium that is present in the posterior chamber ol eye in behind the lens.

Function:

Vitreous humour is a refractive medium of eye that maintains internal pressure of the posterior chamber and maintains the perfect shape of the eye.

Question 12. Write the names of the different refractive mediums of eyeballs in proper sequence.

Answer:

The refractive mediums of the eyeball from outside to inside are—cornea → aqueous humour→lens→vitreous humour.

Question 13. What are eye muscles?

Answer:

Eye muscles:

The five strips of muscles, which bind the eyeball to the inner wall of the orbit or eye socket of the skull, are called eye muscles. The eye muscles control both voluntary and involuntary eye movements.

Question 14. State the location of the tear gland. Mention its function.

Answer:

Tear Gland Location:

The tear gland is located below the upper eyelid of each eye.

Tear Gland Function:

The tear gland releases a watery secretion to keep the exposed surface of the eye wet and clean it from dirt. It contains an enzyme (called lysozyme) that protects the eye against external germs.

 

 

Life Science Class 10 Wbbse

Question 15. What will happen if the tear glands stop secreting?

Answer:

If tear glands stop secreting, the surface of the eye will become dry and coarse. Dirt will settle on the eye and will damage the eye surface. Lack of the enzyme lysozyme will make the eye vulnerable to bacterial attack.

Question 16. What is monocular vision? Name a few animals with monocular vision.

Answer:

1. Monocular vision: In certain animals, two different images of two different objects are formed in two different eyes. As a result, the animal spots two different objects by its two eyes at a time. This is called monocular vision.
2. Animals with a monocular vision: Frogs, horses, most birds, fishes, etc.

Question 17. What is binocular vision? Name a few animals with binocular vision.

Answer:

Binocular vision:

In certain animals, the same image of a single object is formed in both eyes at a time. As a result, the animal spots the complete image of the same object by both of its. eyes. This is called binocular vision.

Animals with binocular vision:

A few animals with binocular vision are men, tigers, owls, etc.

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Question 18. What is an accommodation of the eye?

Answer:

Accommodation of the eye:

Accommodation is the unique ability of the eye to focus objects from different distances perfectly and instantly on the retinal surface. This is done by a quick change in curvature of the lens with the help of ciliary muscles and suspensory ligaments.

Question 19. How does the eye accommodate seeing a nearer object?

Answer:

To accommodate the eye to see a nearer object the ciliary muscles contract and suspensory ligaments relax to increase the curvature of the lens. As a result, the lens becomes thicker and its focal length reduces to create a clear image on the retinal surface.

Question 20. How does the eye accommodate seeing a distant object?

Answer:

To accommodate the eye to see an object located at a distance, the ciliary muscles relax and suspensory ligaments contract to decrease the curvature of the lens. As a result, the lens becomes thinner and its local length reduces to create a clear image on retinal surface.

Question 21. Mention the names of few visual problems

Answer:

The names of few visual problems are- myopia, hypermetropia, cataract, presbyopia, astigmatism, etc.

Question 22. What is myopia? Mention the cause of myopia.

Answer:

Myopia:

The visual Impairment in which a person can see the closer objects, but unable to visualise the distant objects clearly, is called myopia.

Myopia Cause:

In case of myopia, either the shape of the eyeball is too long or the cornea is too much curved. So, the light coming from any distant source creates the image a little ahead of retinal surface to make the distant vision blurred.

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Question 23. What is hypermetropia? Mention its cause.

Answer:

Hypermetropia:

The visual impairment in which a person can visualise the distant objects but is unable to see the closer objects clearly is called hypermetropia.

Hypermetropia Cause:

In the case of hypermetropia either the shape of the eyeball is too short or the cornea is too fiat. As a result, the light coming from a closer source creates the image a little behind the retinal surface to make the near vision blurred.

Question 24. What is presbyopia?

Answer:

Presbyopia:

The natural ability of accommodation of human eye decreases gradually after the age of 40 to 45 due to hardening or loss of elasticity of the lens, causing long-sightedness.

In this ageing-related visual impairment, individuals face a problem in reading and writing. This disease is called presbyopia.

Question 25. What is a cataract?

Answer:

Cataract:

Sometimes the lens of the human eye becomes opaque. Due to this condition, individuals lose clear vision. This visual impairment is called cataract and ii not treated in time, it may cause complete loss of vision.

Question 26. For correction of which defects in the vision of the eye, spectacles of convex and concave lenses are used?

Answer:

Spectacles of convex lenses are used in hyperopia and spectacles of concave lenses are in myopia.

 

Chapter 1 Eye As A Sense Organ In Human Very Short Answer Type Questions Multiple Choice Questions And Answers [Mcq]

Question 1. Which one of the following is a retinal cell?

1. Rod cell
2. Hepatocyte
3. Schwann cell
4. Mast cell

Answer: 1. Rod cell

Question 2. Rhodopsin is present in—

1. Cone cell
2. Rod cell
3. Cell body
4. Carrier cell

Answer: 2. Rod cell

Question 3. The aperture through which light enters into the eyeball is called—

1. Pupil
2. Cornea
3. Choroid
4. Cochlea

Answer: 1. Pupil

Question 4. The transparent outer covering of the eyeball is called—

1. Cornea
2. Sclera
3. Choroid
4. Retina

Answer: 1. Cornea

Question 5. The innermost layer and the most delicate layer of the eyeball where the photoreceptors are located are—

1. Choroid
2. Sclera
3. Retina
4. Cornea

Answer: 3. Retina

Question 6. Which one of the following helps in low-light vision?

1. Cone cell
2. Rod cell
3. Carrier cell
4. Transporter cell

Answer: 2. Rod cell

Question 7. The lens used for distant vision is—

1. Thick lens
2. Thin lens
3. Lens of identical curvature
4. All of these

Answer: 2. Thin lens

Question 8. The shape of the human eye lens is—

1. Concave
2. Convex
3. Bi-convex
4. Bi-concave

Answer: 3. Bi-convex

Question 9. The spot of the retina without rod and cone cells is called—

1. Black spot
2. Yellow spot
3. Fovea
4. Blind spot

Answer: 4. Blind spot

Question 10. An enzyme present in tears is—

1. Amylase
2. Maltase
3. Lysozyme
4. Sucrase

Answer: 3. Lysozyme

Question 11. Near-sightedness is called—

1. Presbyopia
2. Hypermetropia
3. Myopia
4. Cataract

Answer: 3. Myopia

Question 12. The vision problem in which an image is formed behind the retina is palled—

1. Myopia
2. Hyperopia
3. Presbyopia
4. Cataract

Answer: 2. Hyperopia

Question 13. Which of the following is not a refractory medium of an eye?

1. Lens
2. Cornea
3. Sclera
4. Aqueous humour

Answer: 3. Sclera

Question 14. Which of the following gives different colour to the eye?

1. Cornea
2. Iris
3. Lens
4. Choroid

Answer: 2. Iris

Question 15. The area of eye with the most excellent vision is—

1. Lens
2. Cornea
3. Fovea centralis
4. Optic disk

Answer: 3. Fovea centralis

Question 16. The meeting point of the retina and the optic nerve is called—

1. Yellow spot
2. Choroid
3. Eyespot
4. Blind spot

Answer: 4. Blindspot

Question 17. Which nerve receives the visual stimulus?

1. Olfactory
2. Optic
3. Auditory
4. None of the above

Answer: 2. Optic

Question 18. The liquid present in the chamber between the cornea and the lens is—

1. Perilymph
2. Endolymph
3. Aqueous humour
4. Vitreous humour

Answer: 3. Aqueous humour

Question 19. Which of the following has monocular vision?

1. Owl
2. Monkey
3. Tiger
4. Frog

Answer: 4. Frog

Question 20. Feco surgery is done in—

1. Ear
2. Eye
3. Skin
4. Tongue

Answer: 2. Eye

Life Science Class 10 Wbbse

Chapter 1 Eye As A Sense Organ In Human Answer In A Single Word Or Sentence

Question 1. Name the three layers of a human eye.
Answer: Sclera, choroid and retina

Question 2. What is the other name of blind spot?
Answer: Optic disc

Question 3. Which portion of human eye protects it from mechanical injury by dust particles?
Answer: Conjunctiva

Question 4. What is the main function of the human eye?
Answer: Vision.

Question 5. What is sclera?
Answer: Sclera is the outermost protective layer of human eye.

Question 6. Which nerve connects the human eye with the brain?
Answer: Optic nerve

Question 7. Through which opening does light enter in to the eyeball?
Answer: Pupil

Question 8. Which part of the eyeball makes the pupil narrow or wide?
Answer: Iris

Question 9. In which organ do you find the cornea?
Answer: Eye

Question 10. Which protective layer of eye becomes transparent to form the cornea?
Answer: Sclera

Question 11. What is the function of the fluid present in the intermediate chamber between lens and retina of the eyeball?
Answer: The fluid present in the intermediate chamber between lens and the retina is vitreous humour which helps to absorb shocks to the eye and maintains the shape of the eye.

Question 12. Which parts of the body protect the eyes from mechanical injury and airborne particles?
Answer: The two eyelids protect the eyes from mechanical injury and airborne particles.

Question 13. Which type of lens is used to correct myopia?
Answer: Concave lens

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Question 14. Which type of lens is used to correct hypermetropia?
Answer: Convex lens

Question 15. At which minimum distance does an object comes under the range of distant vision?
An object at a minimum distance of 6 metres comes under the range of distant vision.

Question 16. In which eye problem, a person faces difficulty in viewing objects placed at a longer distance?
Answer: Myopia

Question 17. In which eye problem, a person faces difficulty in viewing objects placed at a close distance?
Answer: Hypermetropia

Question 18. Name an ageing-related eye disease.
Answer: Presbyopia

Question 19. Which type of lens is used to rectify presbyopia?
Answer: Bifocal lens

Question 20. Which protective layer is directly connected to the eyeball?
Answer: Conjunctive

Question 21. In which disease the protein of the lens is degraded?
Answer: Cataract

wbbse class 10 life science question answer

Question 22. What are the pigments of rod and cone cells?
Answer: The pigment of the rod cell is rhodopsin and the pigment of the cone cell is iodopsin.

Question 23. What are the components of tears?
Answer: The components of the tear are water, minerals, amino acid, antibody and lysozyme.

Question 24. Why image is not formed in the blind spot?
Answer: Due to the absence of light-sensitive rod and cone cells image is not formed in the blind spot.

 

Chapter 1 Eye As A Sense Organ In Human Fill In The Blanks

Question 1. The retina is composed of rod and _________ cells.
Answer: Cone

Question 2. Other than human being owl has _________ vision.
Answer: Binocular

Question 3. Image of any visible object is formed on the _________ of an eye.
Answer: Retina

Question 4. Rod cells contain _________ pigments.
Answer: Rhodopsin

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Question 5. The concave spot of the retina from which the optic nerve emerges is called _________ spot.
Answer: Blind

Question 6. The centre of the retina lying opposite to the pupil of eye is called _________ spot, where the brightest image is formed.
Answer: Yellow

Question 7. The l/6th part of the sclera in front of the eye remains transparent, which is called _________.
Answer: Cornea

Question 8. The protective layer, just below the sclera of the eye is called _________.
Answer: Choroid

Question 9. The cavities of a skull in which the two eyeballs are lodged are called _________.
Answer: Orbit

Question 10. The thin and transparent fibrous layer above the cornea is called _________.
Answer: Conjunctiva

Question 11. The faintly saline watery discharge from the eye is called _________.
Answer: Tear

Question 12. At the centre of the yellow spot, there is a tiny depression called _________.
Answer: Fovea centralis

Question 13. The gel-like substance present in between the lens and retina is known as _________ humour.
Answer: Vitreous

Question 14. In disease, the lens becomes opaque.
Answer: Cataract

Question 15. Loss of accommodation capacity of a lens, due to ageing, results in to _________ disease.
Answer: Presbyopia

Question 16. The process of necessary adjustment of the focal length of the lens in the human eye is called _________.
Answer: Accommodation

Wbbse Class 10 Life Science Solutions

Chapter 1 Eye As A Sense Organ In Human State True Or False

Question 1. The white outer protective layer of the eye is known as the choroid.
Answer: False

Question 2. Light enters in to the eyeball through the pupil.
Answer: True

Question 3. Sclera regulates the fluctuation in the size of the pupil.
Answer: False

Question 4. The lens of the human eye is biconvex.
Answer: True

Question 5. Tear glands are the protective parts of the eye.
Answer: True

Question 6. Human vision is binocular.
Answer: True

Question 7. The lens becomes thick to see a distant object.
Answer: False

Question 8. A concave lens is used to rectify myopia.
Answer: True

Question 9. To rectify presbyopia bifocal lens is to be used.
Answer: True

Question 10. The inability of accommodation by lens causes cataracts.
Answer: False

Question 11. Choroid helps in the accommodation of the eye by changing the curvature and shape of the lens.
Answer: False

Wbbse Class 10 Life Science Solutions

Chapter 1 Eye As A Sense Organ In Human Match The columns

Question 1. 

Answer: 1. B, 2. D, 3. F, 4. C, 5. A, 6. G

Question 2.

Answer: 1. B, 2. D, 3. A, 4. C, 5. F, 6. E

 

Chapter 1 Eye As A Sense Organ In Humans Find The Odd One Out

Question 1. Aqueous humour, Lens, Cornea, Choroid
Answer: Choroid

Question 2. Cataracts, Xerophthalmia, Presbyopia, Myopia
Answer: Xerophthalmia

Question 3. Aqueous humour, Lens, Cornea, Conjunctiva
Answer: Conjunctiva

Question 4. Vision of a chameleon,  Vision of a monkey,  Vision of a cow,  Vision of a horse
Answer: Vision of a monkey

Question 5. Increase in thickness of the lens, Nearsightedness, Contraction of the ciliary muscle, and Increase in focal length of the lens.
Answer: Increase in focal length of a lens

 

Chapter 1 Eye As A Sense Organ In Human Fill In The Blanks By Looking At The First Pair

Question 1. Chemical impulse: Taste:: Light impulse :
Answer: Vision

Question 2. Ear: Auditory nerve:: Eye :
Answer: Optic nerve

Question 3. Dim light: Rod cells:: Bright light:
Answer: Cone cells

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Question 4. Eyelid: Protecting eye:: Lens:
Answer: Refractory medium

Question 5. Vitreous chamber: Vitreous humour Anterior chamber:
Answer: Aqueous humour

Question 6. Human: Binocular vision : Cow:
Answer: Monocular vision

Question 7. Myopia: Concave lens:: Hyperopia:
Answer: Convex lens

 

Chapter 1 Eye As A Sense Organ In Humans Among The Four Concepts Given, Three Of Them Belong To One Find That

Question 1. The protective layer, Conjunctiva, Sclera, Cornea
Answer: Protective layer

Question 2. Yellow spot, Retina, Blindspot, Rod and cone cells
Answer: Retina

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Question 3. Cornea, Sclera, Eyeball, Iris
Answer: Eyeball

Question 4. Human, Owl, Binocular vision, Hawk
Answer: Binocular vision

Question 5. Contraction of the ciliary muscle, Change in the curvature of the lens, Change in focal length of the lens, and Visual accommodation.
Answer: Visual accommodation

Question 6. Cataract, Myopia, Visual impairment, Hypermetropia
Answer: Visual impairment