ICSE 2009 Solved Important Papers of Biology By Mr. M. P. Keshari

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Biology - Sense Organs (Solved)

Question .1. Name the following :

(i) The eye defect caused due to the shortening of the eyeball from front to back.

(ii) The region of distinct vision in the eye.

(iii) The tube which connects the cavity of the middle ear with the throat.

(iv) The nerve which transmits impulses from the ear to the brain.

(v) The part of eye responsible for its shape.

(vi) Helps to change the focal length of the eye lens.

(vii) The opening through which light enters the eye. 

(viii) The photosensitive pigment present in the rod cells in the retina.

(ix) The part of eye responsible for change in the size of the pupil.

(x) The ear ossicle in contact with oval window of inner ear.

(xi) Adjustment of eye in order to obtain a clear vision of objects at different distances.

(xii) The cells of the retina that are sensitive to colour.

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Question .2. State true or false. Rewrite the wrong statements by changing the words.

(i) Cones are photoreceptor cells that are sensitive to dim light.

(ii) Deafness is caused due to rupturing of pinna.

(iii) Cones are receptor cell in retina of eye sensitive to dim light.

(iv) Hypermetropia is a defect of eye caused due to eyeball being elongated.

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Question .3. Write in logical sequence :

(i) Ear ossicles, oval window, tympanum, auditory canal, cochlea.

(ii) Yellow spot, conjunctiva, pupil, comea, lens, vitreous humour, aqueous humour.

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Question .4. Eye : Optic nerve : : Ear : ……… .

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Question .5. Pick the odd one and write the category.

(i) Semicircular canal, malleus, cochlea, utriculus, sacculus.

(ii) Myopia, hypermetropia, xerophthalmia, astigmatism.

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Question .6. Mention two functions of the choroids coat in the eye.

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Question .7. Give exact location and function of :

(i) Pinna.

(ii) Ear ossicles.

(iii) Fovea.

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Question .8. Structure and functional activity.

Organ of corti and ……… . 

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Question .9. Describe the function of :

(i) Eustachian tube.

(ii) Iris of the eye.

(iii) Ear ossicles.

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Question .10. Choose the correct answer :

Yellow spot and ciliary muscles are found in (eye, ear, heart).

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Question .11. State briefly :

(i) Myopia (symptom and cause).

(ii) Tympanum (location and function).

(iii) Yellow spot (location and importance).

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Question .12. Differentiate between :

(i) Choriod and sclerotic layers of eye.

(ii) Dynamic balance and static balance.

(iii) Rod and cone cells.

(iv) Myopia and hypermetropia.

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Question .13. What is meant by power of accommodation ? Name the muscles of the eye responsible for the same.

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Question .14. Answer briefly :

(i) What is a lacrimal gland ?

(ii) In what two ways is yellow spot different from blind spot ?

(iii) Name an old age eye defect. Why is it caused ?

(iv) Mention the characteristics of the image that falls on the retina of the eye.

(v) Name the photoreceptors found in retina of eye.

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Question .15. Draw a labelled diagram of the inner ear. Name the parts of the inner ear that is responsible for static balance in human beings.

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Question .16. The diagram given below represent the parts of the human ear :

Fig.

(i) Name the parts labelled 1 to 8.

(ii) What is the function of the parts marked 2 and 7 ?

(iii) Why is it harmful to use a pin or any sharp object to remove the wax from the ear ?

(iv) Give the function of ear wax.

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Question .17. The given diagram refers to the ear of a mammal :

Fig.

I. Label the parts 1 to 10 which the guidelines point.

II. Which structure :

(i) Converts sound waves into mechanical vibrations ?

(ii) Converts vibrations into nerve impulses ?

(iii) Responds to change in position ?

(iv) Transmits impulses to the brain ?

(v) Equalizes atmospheric pressure and pressure in the ear ?

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Question .18. Given below is the diagram of a part of the human ear :

Fig.

Study the same and then answer the questions that follow :

(i) Give the biological term for Malleus, Incus and Stapes.

(ii) Name the parts labelled A, B and C in the diagram.

(iii) State the functions of the parts labelled ‘A’ and ‘B’.

(iv) Name the audio receptor region present in the part labelled ‘A’.

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