Given alongside is a diagrammatic representation of a defect of the human eye: Draw a neat labelled diagram to show how this defect can be rectified.

Myopia, or short-sightedness, occurs when the eyeball is too long so it affects how the cornea and lens focus. This means objects in the distance appear blurry because light rays are focusing at the front of the retina rather than directly on its surface. Treatment options include glasses, contact lenses and surgery such as LASIK.

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.

The eye has three main layers. They are the sclerotic layer or sclera, choroid layer and retina. The outermost thick, tough, fibrous, non-elastic and white coloured layer is the sclera. The sclera bulges and forms the cornea. The end of the sclera connects to the optic nerve. The second layer is the choroid layer. This layer is black and contains a lot of blood vessels. It encloses the eye except for the part of the pupil. The part is formed by the choroid layer around the pupil is the iris. Conjunctiva is a jelly-like layer which covering the inner white parts of the eye. Radial and circular muscles are present in the iris. The biconvex lens is present ultimately behind the pupil, attached to the ciliary muscles and suspensory ligaments. The lens divides the inner space of the eyeball into an aqueous chamber and a vitreous chamber. The area of no vision, called the yellow spot is present in the retina. C o n j u n c t i v a → A q u e o u s H u m o u r → P u p i l → V i t r e o u s H u m o u r → Y e l l o w s p o t

Correct and rewrite the statements by changing the biological term that is underlined in the statement: The part of the eye which can be donated from a clinically dead person is the Retina .

The cornea acts as the outermost lens of the eye. It helps our eyes to focus light, to see clear image. For example a patient who has an ocular tumour in the back of the eye may be able to donate the eye at the time the eye is removed. If a person is blind, the blind eye is removed, and can place the healthy cornea. The part of the eye which can be donated from a clinically dead person is the cornea .

State two functions of tears.

Tears are a clear liquid secreted by the lacrimal glands that are tear glands. The two functions of tears are as follows: It lubricates and smoothens the surface of our eyes so that light is refracted which enable us to see objects clearly. They protect your eyes from infections and irritating things, like dirt and dust.

State two functions of ear.

The human ear is a sensitive organ of the human body. The external ear (pinna) is the external structure of the human ear. It is elastic cartilage covered by a layer of skin. Hearing and balance are two important functions of the human ear. The tiny hair cells are found in the inner ear. The hair cells translate the sound waves into impulses that are transmitted to the brain by sensory receptors.

Give biological explanations for the following: We should not put sharp objects into our ears

The eardrum is very delicate, sharp objects may rupture them leading to deafness. Do not use Q-tips, bobby pins or sharp pointed objects to clean your ears. These objects may injure the ear canal or eardrum. Earwax is the ear's mechanism for self-cleaning.

Mention the exact location of the following Incus.

The incus is the middle of three small bones in the middle ear. It is located between malleus and stapes. It transmits vibrations from the malleus to the stapes. Another name of the incus is called the anvil.

E M B I B E

Biology Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Sense Organs>Exercise>Q 14

MEDIUM

10th ICSE

IMPORTANT

Earn 100

Where are the photoreceptors located?

Important Questions on Sense Organs

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10th ICSE

IMPORTANT

Biology Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Sense Organs>Exercise>Q 15

Why presbyopia is inevitable?

HARD

10th ICSE

IMPORTANT

Biology Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Sense Organs>Exercise>Q 16

Why persons with colour blindness are not selected for military or for jobs like that of a driver, pilot etc.?

HARD

10th ICSE

IMPORTANT

Biology Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Sense Organs>Exercise>Q 17

Differentiate photoreceptors of the eye.

EASY

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IMPORTANT

Biology Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Sense Organs>Exercise>Q 18

Given below are certain functional activities of specific structures in the body of living organisms. Name the structure responsible for the same:

Nerve that transfers impulses from inner ear to the brain.

HARD

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IMPORTANT

Biology Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - Sense Organs>Exercise>Q 19

Given alongside is a diagrammatic representation of a defect of the human eye:
Question Image
Draw a neat labelled diagram to show how this defect can be rectified.