Question

14. Jelly-like material filled in the space between the lens and the

retina.

15. The defect of the eye caused due to the uneven curvature of

the cornea.

16. The structure that has a sensory organ called ORGAN OF CORTI.

17. The type of image formed on the retina.

18. The Photoreceptor for bright light.

19. The organ responsible for protecting the eye from sweat.

20. The photosensitive pigment present in the rod cells in the

retina.

I.

he given diagram is of human ear. Study the same and then answer the questions:

Pinna

BE

Eardrum

Auditory canal

Auditory nerve

-D

Eustachian tube

n What role does the eardrum play in hearing? () What common term is given to the parts labelled A, B, E?

(i) Would there be any difference if these three parts mentioned in (ii) above were replaced by one bone? Why?

(iv) Give the biological term for the parts labelled C and D. (v) State the fluid which fills the part mentioned in (iv) above.

(vid State the function of ear. Two function.​

Answer 1

Answer:

14. The vitreous humor is a transparent, colorless, gelatinous mass that fills the space in the eye between the lens and the retina. It is surrounded by a layer of collagen called the vitreous membrane (or hyaloid membrane or vitreous cortex) separating it from the rest of the eye.

15. Astigmatism is a term used for the irregular shape of the surface of the eye called the cornea. The abnormal curve of the cornea means that when light enters the eye, it is not correctly focused on the retina, resulting in an unclear image.

16. The organ of Corti is located in the scala media of the cochlea of the inner ear between the vestibular duct and the tympanic duct and is composed of mechanosensory cells, known as hair cells.

17. It's real and inverted. The lens of the human eye is biconvex. When we see an object, the light rays from the object get refracted and as a result of that the image will focus on the retina. The image thus formed is real and inverted

18. These specialized cells are called photoreceptors. There are 2 types of photoreceptors in the retina: rods and cones. The rods are most sensitive to light and dark changes, shape and movement and contain only one type of light-sensitive pigment. ... Cones, however, work only in bright light.

19. The human eyelid features a row of eyelashes along theeyelid margin, which serve to heighten the protection of theeye from dust and foreign debris, as well as fromperspiratio

20. The membranous photoreceptor protein opsin contains a pigment molecule called retinal. In rod cells, these together are called rhodopsin.

Explanation:

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