Lakhmir Singh solutions for बायोलॉजी [इंग्रजी] इयत्ता १० आईसीएसई chapter 11 - Sense Organs [Latest edition]

The eyeball appears white in colour due to ______.

When light of more intensity strikes our eyes, our ______ expands.

The light-sensitive tissues known as photoreceptors are found in ______.

True or False.

Blind spot is the area of the best vision.

True or False.

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

True or False.

Human eye can compare different colours of light due to the presence of cone cells.

The part of eye which detects the intensity of light is known as ______.

The eyeball is made up of how many layers?

Which property of light can be related with the eye lens?

The biconvex lens produces ______ on the retina.

The ______ present in the tears has antiseptic properties.

The cones of retina are stimulated only in ______ light.

True or False.

Human eyes have only three types of photo pigments.

True or False.

One cannot differentiate colours at night because rods are not stimulated at night.

Why do we prefer to sit on the back rows in a cinema hall than the front rows?

For distant vision, the lens is more ______.

The type of lens in our eyes is ______.

The area where there is zero vision is called the ______ spot.

We can differentiate various colours due to the presence of ______ cells.

Astigmatism can be corrected by wearing a ______ lens.

When the transparent front part of the eye becomes opaque, the condition is known as ______.

Near sightedness is also termed as ______.

Which is not correct about myopia?

In hyperopia, the image is formed ______.

True or False.

Colour blindness is hereditary.

True or False.

Squint cannot be corrected.

You must have seen ear wax coming out of ears. Do you know what are they? How do ears clean themselves?

There are some people that have different coloured eyes. Do you know what this condition is called? What is the cause of such a condition?

______ section of the eye can be donated by grafting for those who have eye defect.

Dolphins and bats can hear above ______ kHz frequencies while whales can hear ______ sounds of 7 Hz.

Hearing and balancing functions are done by the ______.

The ears are involved in which of the following functions?

Which of the following pairs do not have the name of an ear ossicle?

The part connecting the external ear to the middle ear is ______.

The organ involved in the function of hearing is ______.

The sense of hearing is also known as ______.

True or False.

Presbyopia is as a result of lens losing its flexibility.

True or False.

In hyperopia, the person is able to see near objects clearly.

True or False.

The blind spot is the area where no image is formed.

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

Ciliary muscles regulate the size of the pupil

True or False.

Astigmatism is due to uneven curvature of the cornea.

True or False.

The eustachian tube connects the cavity of the middle ear with the throat.

True or False.

Another term for the eardrum is tympanum.

The size of the pupil becomes ______ when you see in dim light.

The watery fluid inside the internal ear is known as ______.

The inner ear consists of ______ and vestibular system.

The organ of corti transforms the mechanical energy of sound waves into nerve energy by creating ______ impulses.

______ glands are located at the upper sideward portion of the eye orbit.

______ is the smallest bone in the human body.

Match the Following:

Name the following:

The photosensitive pigment present in the rods of the retina.

Give One Word Answer:

The part of ear shaped like the shell of a snail.

Give One Word Answer:

The part of the eye grafted from a donated eye to restore the vision.

Name the following:

The eye defect caused due to shortening of the eye ball from front to back.

Give One Word Answer:

The part of eye responsible for vision.

Name the following:

The layer of the eyeball that provides nourishment to the eye.

Name the following:

The layer of the eyeball that forms the transparent cornea.

The tiny bone attached to the eardrum is ______.

The ______ separates the outer ear from the middle layer.

Fluid moving in the ______ causes dizziness even when you stop spinning around.

Foods rich in which vitamin is good for the eyes?

Myopia is treated with ______.

Which of the following functions does an ear perform?

Which part of the ear takes sound and turns them into vibrations?

Aqueous humour is present between the ______.

Given below are sets of five terms each. Rewrite the terms in correct order in a logical sequence beginning with the first word that is underlined.

Conjunctiva, Yellow spot, Pupil, Vitreous Humour, Aqueous Humour.

Correct and rewrite the statement by changing the biological term that is underlined for the statement: 

The part of the eye which can be donated from a clinically dead person is the Retina.

What different types of sense organs we have? Discuss briefly.

Why is the blind spot known as the area of 'no vision'?

What is myopia and how it can be corrected?

What causes eye lens to turn opaque and what is the term for this condition?

Why can't we differentiate between colours at night?

What is the importance of accommodation in the eye?

Why do you get motion sickness while travelling in a car?

How does the ear help in maintaining the body balance?

Define the following term:

Conjunctiva

Define:

Organ of corti

Define:

Choroid layer

Define:

Accommodation of the eye

Define the following term:

Ear ossicles

Define:

Lacrimal glands

What is after image effect?

Differentiate between:

Rods and Cones.

Differentiate between:

Yellow spot and Blind spot.

Differentiate between the Following:

Vitreous chamber and Aqueous chamber

Differentiate between the Following:

Night blindness and Colour blindness

Differentiate between the Following:

Myopia and Hyperopia

What are photoreceptors of eyes and where are they found? What is the function of these cells?

How do we perceive an object in an upright manner even though the image formed on the retina is inverted?

Explain the process of sound transmission in humans.

Explain the process of sound perception in humans.

Explain internal and external eye. Draw a neat and labelled diagram of a cross-section of an eye.

Describe briefly the common eye disorders.

Describe outer, middle and inner ear.

The diagram given below depicts a defect of the human eye which has been corrected by using a suitable lens. Answer the following questions:

1. Name the defect that has been corrected. Which type of lens has been used for the correction?
2. Mention one cause for the above defect.
3. Where would the image have formed if the above lens was not used for correction?
4. Name the three concentric layers of the eyeball.
5. Draw a neat, labelled diagram of a neuron.

1. Draw a well-labelled diagram of the membranous labyrinth found in the inner ear.
2. Based on the diagram drawn above in (i), give a suitable term for each of the following descriptions:
   1. The sensory cells that help in hearing.
   2. The part that is responsible for static balance of the body.
   3. The membrane-covered opening that connects the middle ear to the inner ear.
   4. The fluid present in the middle chamber of cochlea.
   5. The structure that maintains dynamic equilibrium of the body.

When you go to an ophthalmologist for getting your eyes checked, you are asked to identify letters on a board kept at a fixed distance. Make a similar board using a cardboard or thermocol with letters replicating the original board. Test the eyesight of your friends, classmates, parents, teachers, neighbours and grandparents. Make a data table containing figures of the number of people with normal eye sight and defective eye sight.

Ask your teacher about how people deal with hearing problems.

1. How do doctors detect that a child has hearing problems? Learn about hearing devices/aids for children and elders. Make a list of the latest hearing aids/devices.
2. Do people have hearing problems from birth or it can develop over time?
3. What are the reasons people suddenly turn deaf?