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Questions
State the functions of the following:
Iris
Write the main functional activity of the following structure.
Solution
Controls the size of the pupil and the amount of light entering the eye. It also affects the colour of the eyes.
RELATED QUESTIONS
Name the part of the eye:
which controls the amount of light entering the eye.
Give the scientific names of the following parts of the eye:
muscles which change the shape of the eye-lens.
Give the scientific names of the following parts of the eye:
a hole in the middle of the iris.
What changes take place in the shape of eye-lens:
when the eye is focused on a distant object?
List, in order, the parts of the eye through which light passes to reach the retina.
The descriptions of five kinds of images are given below:
(a) diminished and virtual
(b) enlarged and real
(c) enlarged and erect
(d) real and inverted
(e) virtual and the same size
Which one of these describes the image formed:
(i) on the retina of the eye?
(ii) by a magnifying glass?
(iii) by a convex driving mirror on a car?
(iv) by a plane mirror?
(v) on the screen of a slide projector?
Nocturnal animals (animals which sleep during the day and come out at night) tend to have wide pupils and lot of rods in their retinas. Suggest reasons for this.
State whether the following statement is true or false:
Rabbit has eyes which look sideways.
Name the following:
The part of the eye responsible for its shape.
State the function of each of the following parts of the human eye:
(i) Cornea
(ii) Iris
(iii) Pupil
(iv) Retina
Millions of people of the developing countries are suffering from corneal blindness. This disease can be cured by replacing the defective cornea with the cornea of a donated eye. Your school has organised a campaign in the school and its neighbourhood in order to create awareness about this fact and motivate people to donate their eyes after death. How can you along with your classmates contribute in this noble cause? State the objectives of organising such campaigns in schools.
Define the following:
Yellow spot
Give the main function of the following:
Three semicircular canals
Choose the correct answer.
In the chemistry of vision, the photosensitive substance is _________________
Choose the correct answer.
Aperture controlling passage to light into the eye is ___________
Explain the Term: Accommodation in the eye
A small hole of changing diameter at the centre of Iris is called _______.
The larynx has fold of tissue which vibrate with the passage of air to produce sound.
The muscular diaphragm that controls the size of the pupil is ____________.
With reference to human eye, answer the following question.
What is blind spot?
Name the following:
Three layers of the eye ball.
