Observe the illustration and answer the following questions. How impulses are generated in these cells when light rays fall on it?

Photoreceptors can be characterised as specialized cells that are found in the retina of the eye. The receptors of the eyes are extremely specialized neuroepithelial cells. There are two types of photoreceptors present in the eyes of the human. These are rod and cone cells. Cone cells help in colour vision. When light falls on cone cells, the photopsin in them dissociates into retinal and opsin. Rod cells help in dim light or low light vision. When light falls on rod cells, the pigment rhodopsin in them dissociates into retinal and opsin. This chemical change creates impulses and sends signals to the brain through the optic nerve for the processing of images.

Observe the illustration and answer the following questions. Explain the role of these cells in making vision possible.

Photoreceptors can be characterised as specialized cells that are found in the retina of the eye. The receptors of the eyes are extremely specialized neuroepithelial cells. There are two types of photoreceptors present in the eyes of the human. These are rod and cone cells. Cone cells help in colour vision. When light falls on cone cells, the photopsin in them dissociates into retinal and opsin. Rod cells help in dim light or low light vision. When light falls on rod cells, the pigment rhodopsin in them dissociates into retinal and opsin. This chemical change creates impulses and sends signals to the brain for the processing of images.

EASY

Earn 100

What is rhodopsin and iodopsin?

Important Questions on Control and Coordination

EASY

Science>Biology>Control and Coordination>Introduction to Control and Coordination

Observe the illustration and answer the following questions.

Question Image

How impulses are generated in these cells when light rays fall on it?

MEDIUM

Science>Biology>Control and Coordination>Introduction to Control and Coordination

The process that leads to the formation of impulses in photoreceptors is :

EASY

Science>Biology>Control and Coordination>Introduction to Control and Coordination

Fill the blanks in the statement.
"Three types of cone cells are present in human eye. This is due to the chänge in _____ in the Opsin molecule"

EASY

Science>Biology>Control and Coordination>Introduction to Control and Coordination

Observe the illustration and answer the following questions.

Question Image

Explain the role of these cells in making vision possible.

HARD

Science>Biology>Control and Coordination>Introduction to Control and Coordination

Give the biological reasons for the following statement:
We cannot distinguish colours in dim light.

EASY

Science>Biology>Control and Coordination>Introduction to Control and Coordination

Why does one feel blinded for a short while coming out of a dark room?

EASY

Science>Biology>Control and Coordination>Introduction to Control and Coordination

State one difference between the rods and cones.

EASY

Science>Biology>Control and Coordination>Introduction to Control and Coordination

Differentiate between rod cells and cone cells on the basis of pigment present in them.

HARD

Science>Biology>Control and Coordination>Introduction to Control and Coordination

Given below is set of five terms. Rewrite the terms in a logical sequence as directed at the end of each statement:
Pupil, Yellow Spot, Cornea, Lens, Aqueous Humour. (path of entry of light into the eye from an object).

HARD

Science>Biology>Control and Coordination>Introduction to Control and Coordination

Name the ability to perceive depth or the relative distance of the objects.

MEDIUM

Science>Biology>Control and Coordination>Introduction to Control and Coordination

What is visual purple?

EASY

Science>Biology>Control and Coordination>Introduction to Control and Coordination

State the function of yellow spot in the eye.

EASY

Science>Biology>Control and Coordination>Introduction to Control and Coordination

Differentiate between the following pairs on the basis of what is mentioned within brackets:-
Rod cells and cone cells (pigment)