Qstnid -Ii-1- With Reference To The Functioning Of The Eye, Answer The Questions That Follow: (A) What Is Meant By 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 Structure 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 (1) In The Dark And (2) In The Light. (B) What Is The Shape Of The Lens During (1) Near Vision (2) Distant Vision? (C) Name The Two Structure 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 (1) In The Dark And (2) In The Light. - 08: The Nervous System - Icse-x-biology

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ICSE-X-Biology

08: The Nervous System

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#1
With reference to the functioning of the eye, answer the questions that follow: (a) What is meant by 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 structure 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 (1) in the dark and (2) in the light. (b) What is the shape of the lens during (1) near vision (2) distant vision? (c) Name the two structure 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 (1) in the dark and (2) in the light.
Ans : (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) Shape of the eye:
• Near vision - flattened
• Distant - rounded or more convex (c) Ciliary muscles and suspensory ligament (d) In the dark: Cells - rod cells, Pigment - rhodopsin
In the light: Cells - cone cells, Pigment - iodopsin (b) Shape of the eye:
• Near vision - flattened
• Distant - rounded or more convex (c) Ciliary muscles and suspensory ligament (d) In the dark: Cells - rod cells, Pigment - rhodopsin
In the light: Cells - cone cells, Pigment - iodopsin

#1-a
What is meant by 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 structure 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 (1) in the dark and (2) in the light.
Ans : 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) Shape of the eye:
• Near vision - flattened
• Distant - rounded or more convex (c) Ciliary muscles and suspensory ligament (d) In the dark: Cells - rod cells, Pigment - rhodopsin
In the light: Cells - cone cells, Pigment - iodopsin

#1-b
What is the shape of the lens during (1) near vision (2) distant vision?
Ans : Shape of the eye:
• Near vision - flattened
• Distant - rounded or more convex

#1-c
Name the two structure in the eye responsible for bringing about the change in the shape of the lens.
Ans : Ciliary muscles and suspensory ligament

#1-d
Name the cells of the retina and their respective pigments which get activated (1) in the dark and (2) in the light.
digAnsr: I
Ans : In the dark: Cells - rod cells, Pigment - rhodopsin
In the light: Cells - cone cells, Pigment - iodopsin