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Concise Biology Part II - Selina Solution for Class 10 Biology Chapter 11 - Sense Organs

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Selina Textbook Solutions Chapter 11 - Sense Organs

Selina Textbook Solutions are a perfect way to ace your examination with high marks. These Textbook Solutions are extremely helpful for solving difficult questions in the ICSE Class 10 Biology exam. Our Selina Textbook Solutions are written by our subject experts. Find all the answers to the Selina textbook questions of Chapter 11 - Sense Organs.

All solutions Selina textbook questions of Chapter 11 - Sense Organs are created in accordance with the latest ICSE syllabus. These free Textbook Solutions for ICSE Class 10 Selina Concise Biology will give you a deeper insight on the fundamentals in this chapter and will help you to score more marks in the final examination. ICSE Class 10 students can refer to these solutions while doing their homework and while studying and revising for the Biology exam. 

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Concise Biology Part II - Selina Solution for Class 10 Biology Chapter 11 - Sense Organs Page/Excercise 1

Solution A.1

(b) Cornea

Solution A.2

(b) Cochlea

Solution A.3

(c) Eustachian tube, tympanum and utriculus

Solution A.4

(a) Retina

Solution B.1

(a) Rhodopsin

(b) Eustachian tube

(c) Hammer

(d) Dura mater

(e) Eustachian tube

(f) Cornea

(g) Auditory nerves

(h) Rods and cones

(i) Hypermetropia

Solution B.2

(a) Cones: Iodopsin:: rods: rhodopsin

(b) Sound: ear drum:: dynamic balance: semi-circular canals

Solution B.3

Column I

Column II

i. The blind spot

(h) no sensory cells

ii. The yellow spot

(g) centre of the retina

iii. Ciliary muscle

(b) Shape of the lens

iv. Iris

(e) free of rod cells, (a) colour of the eye

v. Meninges

(c) Protective covering of the brain

Solution C.1

(a) Myopia results when the eye ball is lengthened from front to back or the lens is too curved.

Hyperopia results from either too shortening of the eyeball from front to back or when the lens is too flat.

(b) Rods are sensitive to dim light but do not respond to colour.

cones are sensitive to bright light and are responsible for colour vision.

(c) cochlea is responsible for hearing; it can perceive the senses of hearing.

Semicircular canals are responsible for perceiving the senses to maintain the body balance.

(d) Rod cells contain rhodopsin whereas the cone cells contain iodopsin.

(e) Dynamic balance is when the body is in motion whereas static balance is positional balance with respect to gravity.

Solution C.2

(a) False

Correct statement: Deafness is caused due to rupturing of the eardrum.

(b) False

Correct statement: Semicircular canals are concerned with dynamic balance.

Solution C.3

(a) Fovea centralis is located at the back of the eye almost at the centre of the eyeball. It is the region of the brightest vision and also of the colour vision.

(b) Organ of corti is located in the inner ear. It contains sensory cells which process hearing.

Solution C.4

(a) True

(b) False/ Ciliary muscles regulate the size of the lens.

(c) True

(d) False/The auditory nerve responsible for sound as well as for the body balance.

(e) True

(f) False/ flavour is a combination of taste and smell.

(g) False/ short-sightedness is myopia and hyperopia is long-sightedness.

(h) True

Solution C.5

(a) Auditory canal, tympanum, ear ossicles, oval window, cochlea

(b) Conjunctiva, cornea, lens, retina, optic nerve

Solution C.6

(a) Organ of Corti and hearing

(b) Olfactory nerve and smell

(c) Retina and vision

Solution C.7

(a) Lacrimal gland is a tear gland located at the upper sideward portion of the eye orbit. Its secreation lubricates the surface of the eye, washes aways the dust particles and kills germs

(b) Yellow spot is the region of brightest vision and contains maximum sensory cells whereas a blind spot contains no sensory cells and this is the point of no vision.

(c) Presbyopia is an age-old eye defect. In this condition, the lens loses flexibility resulting in far-sightedness.

Cataract is also very common in old people, the cornea becomes opaque and the vision is cut down even to blindness.

(d) The process of focusing the eye at different distances is called the power of accommodation.

(e) The image formed on the retina is inverted and real.

Solution C.8

An optical illusion is the life-like continuous movement on the screen. Television is an example of optical illusion, where the scanning beam of a picture frame of the TV camera moves so rapidly on the viewing screen of the TV set that our eyes cannot keep pace with it.

Solution C.9

(a) Oval window is located in the middle ear. It helps in setting the fluid in the cochlear canals into vibration.

(b) Cochlea is located in the inner ear. It helps in transmitting impulses to the brain via the auditory nerve.

(c) Semicircular canals are located in the inner ear. These help in maintaining the dynamic equilibrium of the body.

(d) Utriculus is located in the inner ear. It joins the semi-circular canals to cochlea. It also helps in maintaining static balance of the body.

Solution C.10

Structure

Function

Yellow Spot

Region of the brightest vision

Auditory nerve

Transfers impulse from inner ear to brain

Ciliary muscle

Helps to change the focal length of the eye lens

Spinal cord

Conducts impulses

Oval window

Sets fluid in cochlear canal into vibration

Semicircular canals

Dynamic equilibrium

Solution D.1

While reading a book, the lens is more convex or rounded due to contraction of ciliary muscles because the book is usually read from a short distance. When we raise our head and look at a distant object, the ciliary muscles relax to build the tension on the suspensory ligament so that they can stretch the lens. This change in the curvature of the lens makes us focus on distant object.



Solution D.2

The brain sees the vivid picture of the dream through the eyes. Our eyes have actually never seen the vivid picture. This is an example of optical illusion. The area of dream is controlled by the cerebrum of the central nervous system. So sometime we can remember the vivid picture seen in the dream.

Solution D.3

If we look at a bright object and then close our eyes, the sensation of light persists for a short period. This is known as persistence image or the after image. It lasts for one-tenth of a second. Therefore by closing the eyes and gently pressing them with your palms, you see some specs of brilliant light.

Solution D.4

Adaptation is the ability to adjust vision in bright and dark areas. When we enter a dark room from bright light, the rhodopsin pigment broken down in bright light is regenerated. It dilates the pupil and allows more light to enter the eyes. This is called dark adaptation. On the other hand, if we enter bright area from a dark room, the rhodopsin pigment is bleached. This constricts the pupil and reduces the light entering the eyes. This is called 'light adaptation'

 

Accommodation is the process of focusing the eye at different distances. This is mainly brought about by a change in the curvature of the lens. When the ciliary muscles contract, the lens becomes thicker and we are able to focus a nearby object. On the other hand when the ciliary muscles relax, the lens remains stretched i.e. the normal condition and we are able to focus on distant object.

Solution D.5

Our eyes are designed to focus at a great variety of distances. To focus constantly at a short distance can make the lens focusing muscles fatigued. Therefore, we do not enjoy watching a movie from a very short distance from the screen in cinema hall.

Solution D.6

Defect of vision

Cause

Corrective measure

Myopia

Lengthening of eye ball from front to back or the lens is too curved.

Using suitable concave lens

Hyperopia

Shortening of eye ball from front to back or the lens is too flat.

Using suitable convex lens

Astigmatism

Uneven curvature of the cornea

Using suitable cylindrical lenses

Presbyopia

Loss of flexibility of lens

Using suitable convex lens

Cataract

Lens turning opaque

Surgery or use of convex lens or implantation of plastic lens.

Colour blindness

Genetic defect

No control measure

Squint

Formation of cross-eye

Surgery and suitable exercise

Solution D.7

The three ear ossicles are: Malleus (hammer), Incus (anvil) and Stapes (stirr up).

The last ear ossicle, stapes, vibrates and transmits the vibration to the oval window.

The role of other two ear ossicles is to magnify the vibration of stapes as a result of their lever like action.

Solution D.8

The process of focusing the eye at different distances is called the power of accommodation. The ciliary muscles are responsible for the power of accommodation.

Solution E.1

a. The ability of the eye to focus sharply on things which are near to the eye as well as far off is known as the power of accommodation.

 

b. Shape of the eye:

 Near vision - flattened

 Distant - rounded or more convex

 

c. Ciliary muscles and suspensory ligament

 

d. In the dark: Cells - rod cells, Pigment - rhodopsin

In the light: Cells - cone cells, Pigment - iodopsin

Solution E.2

a. The middle ear or membranous labyrinth has two structures inside it, the cochlea and the semi-circular canals.

 

b. Malleus, incus and stapes

 

c. Static balance - Utriculus and sacculus (inner ear)

Hearing - Internal ear

Dynamic balance - Semi-circular canals (inner ear)


d. Collectively they are termed as ossicles.

Solution E.3

(a) Cornea is comparable to the lens cover of the camera.

The iris and pupil act like the aperture of a camera.

(b) The cornea is the eye's main focusing element. It takes widely diverging rays of light and bends them through the pupil; the rays are further converged by the lens.

Solution E.4

(a) Myopia

(b) The two possible reasons for myopia are either the eye ball is lengthened from front to back or the lens is too curved.

(c) 1 - vitreous humour, 2 - blind spot, 3-lens, 4-pupil

(d) Concave lens

(e)

Solution E.5

(i) Ear

(ii) m - malleus, i - incus and s - stapes respectively. These are collectively called as ear ossicles.

(iii) Cochlea. The vibrating movements in the hair of the sense cells of cochlea transmit the impulse for hearing to the brain via auditory nerve.

(iv) Tympanic membrane. It vibrates and then sets the ear ossicles into vibration in the process of hearing.

Solution E.6

(i) Ear ossicles

(ii) A - Cochlea, B - Semicircular canals, C - Ear ossicles

(iii) Cochlea helps in transmitting impulses to the brain via the auditory nerve. Semicircular canals help in maintaining dynamic equilibrium of the body.

(iv) Organ of Corti

Solution E.7

 

 

Utriculus and Sacculus are responsible for maintaining static balance in human beings.

Solution E.8

(a) Myopia

(b) A-Normal eye, B-Myopia

(c) Looking glasses with the concave lens are required here.

TopperLearning provides step-by-step solutions for each question in each chapter. Access Chapter 11 - Sense Organs  for ICSE Class 10 Biology free of cost. The solutions are provided by our subject matter experts. Refer to our solutions for the Selina Concise Biology textbook to revise the whole chapter and clear your fundamentals before the examination. By referring to the solutions for this chapter and the others, we hope that you are able to write your exams well.

Text Book Solutions

ICSE X - Biology

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