Q1 of 102 Page 130

With reference to the functioning of the eye, answer the questions that follow:

(a) What is meant by the power of accommodation of the eye?


(b) What is the shape of the lens during (1) near vision (2) distant vision ?


(c) Name the two structures in the eye responsible for bringing about the change in the shape of the lens.


(d) Name the cells of the retina and their respective pigments which get activated

(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) (1) near vision – flattened or less convex


(2) distant vision – rounded or more convex


(c) Ciliary muscles and suspensory ligament


(d) (1) in the dark - Cells - rod cells, Pigment - rhodopsin


(2) in the light - Cells - cone cells, Pigment – iodopsin


More from this chapter

All 102 →
7

Name the three ear ossicles. How do they contributee to the mechanism of hearing?

 8

What is meant by Power of accommodation of the eye? Name the muscles of the eye responsible for the same...................................................

 2

With reference to the human ear, answer the questions that follow:

(a) Give the technical term for the structure found in the inner ear.


(b) Name the three small bones present in the middle ear.


What is the biological term for them collectively?


(c) Name the part of the ear associated with


(d) Name the nerve, which transmits messages from the ear to the brain.

 3

The figure below compares a part of our eye with a part of a photographic camera


(a) Name the corresponding parts of the eye and the camera shown here that are comparable in function.


(b) Explain the mode of working and the function of the parts of the eye mentioned above.