285010
In mammalian eye, the 'fovea' is the center of the visual field, where
1 More rods than cones are found
2 High density of cones occur, but has no rods
3 The optic nerve leaves the eye
4 Only rods are present
Explanation:
B The fovea centralis is located in the center of the macula lutea, a small, that spot located exactly in the center of posterior portion of the retina. Fovea has highest visual activity which has only cone cells and no rod cell. Fovea is responsible for high activity vision. It is densely saturated with cone photoreceptors. To form high resolution images, the light must fall on the fovea and that limits the acute vision angle to about 15 degree. In low light, this fovea constitutes a second blind spot since it's cones do not function in low/dim light.
AIPMT (Re-Exam)-2015
Neural Control and Coordination
285014
Parts \(A, B, C\) and \(D\) of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics:-
1 D- Choroid - its anterior part forms ciliary body
2 A - Retina - contains photo receptors-rods and cones
3 B - Blind spot - has only a few rods and cones
4 \(\mathrm{C}\) - Aqueous chamber-reflects the light which does not pass through the lens
Explanation:
B In the given diagram, A is retina. Retina is innermost layer of eye. It contain three layers of neural cell from inside to outside-ganglion cell, biopolar cell and photoreceptor cell. There are two type of photo receptor cell, namely, rods and cones. These cells contain the light sensitive proteins called photopigment. The rods contain a purplish-red protein called the rhodopsin, which contain a derivative of vitamin A. The daylight (Photopic) vision and colour vision are function of cones.
NEET-2013
Neural Control and Coordination
285020
Examine the diagram of the two cell types \(A\) and \(B\) given below and select the correct option
1 Cell \(\mathrm{A}\) is the rod cell found evenly all over retina
2 Cell A is the cone cell more concentrated in the fovea centralis
3 Cell B is concerned with colour vision in bright light
4 Cell A is sensitive to low light intensities
Explanation:
B The fovea centralis is the central region of retina in the human eye that contains high concentration of cone cells. Cone cell are photoreceptor cell responsible for colour vision. The concentration of cone is higher in center region in compared to the peripheral region, which allows for vision in the central field of view.
AIIMS-2006
Neural Control and Coordination
285023
Which of the following is true for the function of labelled parts in the diagram below?
1 A- Blind spot - Image is formed here
2 B- Fovea - No visual activity is present
3 C- Cornea - helps to hold lens in place
4 D- Iris - Visible coloured portion of eye
Explanation:
D Only (d) one is a correct answer. In the given diagram (d) is a correctly labeled function here. The iris is the colored part of the eye that surrounds the pupil. It is a thin, circular structure with a central opening (the pupil) that can change size according the light brightness. The color of a person's iris varies and is determined by the amount and type of pigments such as brown, blue, greens, or hazel. - Fovea centralis: It is responsible for sharp central vision (also called foveal vision), which is necessary in humans for reading, driving and any activity where visual details is primary importance. Sharpest vision occurs here. - Blind spot: No image is formed here because both rod and cone light receptor absent. - Ciliary body: It helps to hold the lens in position.
285010
In mammalian eye, the 'fovea' is the center of the visual field, where
1 More rods than cones are found
2 High density of cones occur, but has no rods
3 The optic nerve leaves the eye
4 Only rods are present
Explanation:
B The fovea centralis is located in the center of the macula lutea, a small, that spot located exactly in the center of posterior portion of the retina. Fovea has highest visual activity which has only cone cells and no rod cell. Fovea is responsible for high activity vision. It is densely saturated with cone photoreceptors. To form high resolution images, the light must fall on the fovea and that limits the acute vision angle to about 15 degree. In low light, this fovea constitutes a second blind spot since it's cones do not function in low/dim light.
AIPMT (Re-Exam)-2015
Neural Control and Coordination
285014
Parts \(A, B, C\) and \(D\) of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics:-
1 D- Choroid - its anterior part forms ciliary body
2 A - Retina - contains photo receptors-rods and cones
3 B - Blind spot - has only a few rods and cones
4 \(\mathrm{C}\) - Aqueous chamber-reflects the light which does not pass through the lens
Explanation:
B In the given diagram, A is retina. Retina is innermost layer of eye. It contain three layers of neural cell from inside to outside-ganglion cell, biopolar cell and photoreceptor cell. There are two type of photo receptor cell, namely, rods and cones. These cells contain the light sensitive proteins called photopigment. The rods contain a purplish-red protein called the rhodopsin, which contain a derivative of vitamin A. The daylight (Photopic) vision and colour vision are function of cones.
NEET-2013
Neural Control and Coordination
285020
Examine the diagram of the two cell types \(A\) and \(B\) given below and select the correct option
1 Cell \(\mathrm{A}\) is the rod cell found evenly all over retina
2 Cell A is the cone cell more concentrated in the fovea centralis
3 Cell B is concerned with colour vision in bright light
4 Cell A is sensitive to low light intensities
Explanation:
B The fovea centralis is the central region of retina in the human eye that contains high concentration of cone cells. Cone cell are photoreceptor cell responsible for colour vision. The concentration of cone is higher in center region in compared to the peripheral region, which allows for vision in the central field of view.
AIIMS-2006
Neural Control and Coordination
285023
Which of the following is true for the function of labelled parts in the diagram below?
1 A- Blind spot - Image is formed here
2 B- Fovea - No visual activity is present
3 C- Cornea - helps to hold lens in place
4 D- Iris - Visible coloured portion of eye
Explanation:
D Only (d) one is a correct answer. In the given diagram (d) is a correctly labeled function here. The iris is the colored part of the eye that surrounds the pupil. It is a thin, circular structure with a central opening (the pupil) that can change size according the light brightness. The color of a person's iris varies and is determined by the amount and type of pigments such as brown, blue, greens, or hazel. - Fovea centralis: It is responsible for sharp central vision (also called foveal vision), which is necessary in humans for reading, driving and any activity where visual details is primary importance. Sharpest vision occurs here. - Blind spot: No image is formed here because both rod and cone light receptor absent. - Ciliary body: It helps to hold the lens in position.
285010
In mammalian eye, the 'fovea' is the center of the visual field, where
1 More rods than cones are found
2 High density of cones occur, but has no rods
3 The optic nerve leaves the eye
4 Only rods are present
Explanation:
B The fovea centralis is located in the center of the macula lutea, a small, that spot located exactly in the center of posterior portion of the retina. Fovea has highest visual activity which has only cone cells and no rod cell. Fovea is responsible for high activity vision. It is densely saturated with cone photoreceptors. To form high resolution images, the light must fall on the fovea and that limits the acute vision angle to about 15 degree. In low light, this fovea constitutes a second blind spot since it's cones do not function in low/dim light.
AIPMT (Re-Exam)-2015
Neural Control and Coordination
285014
Parts \(A, B, C\) and \(D\) of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics:-
1 D- Choroid - its anterior part forms ciliary body
2 A - Retina - contains photo receptors-rods and cones
3 B - Blind spot - has only a few rods and cones
4 \(\mathrm{C}\) - Aqueous chamber-reflects the light which does not pass through the lens
Explanation:
B In the given diagram, A is retina. Retina is innermost layer of eye. It contain three layers of neural cell from inside to outside-ganglion cell, biopolar cell and photoreceptor cell. There are two type of photo receptor cell, namely, rods and cones. These cells contain the light sensitive proteins called photopigment. The rods contain a purplish-red protein called the rhodopsin, which contain a derivative of vitamin A. The daylight (Photopic) vision and colour vision are function of cones.
NEET-2013
Neural Control and Coordination
285020
Examine the diagram of the two cell types \(A\) and \(B\) given below and select the correct option
1 Cell \(\mathrm{A}\) is the rod cell found evenly all over retina
2 Cell A is the cone cell more concentrated in the fovea centralis
3 Cell B is concerned with colour vision in bright light
4 Cell A is sensitive to low light intensities
Explanation:
B The fovea centralis is the central region of retina in the human eye that contains high concentration of cone cells. Cone cell are photoreceptor cell responsible for colour vision. The concentration of cone is higher in center region in compared to the peripheral region, which allows for vision in the central field of view.
AIIMS-2006
Neural Control and Coordination
285023
Which of the following is true for the function of labelled parts in the diagram below?
1 A- Blind spot - Image is formed here
2 B- Fovea - No visual activity is present
3 C- Cornea - helps to hold lens in place
4 D- Iris - Visible coloured portion of eye
Explanation:
D Only (d) one is a correct answer. In the given diagram (d) is a correctly labeled function here. The iris is the colored part of the eye that surrounds the pupil. It is a thin, circular structure with a central opening (the pupil) that can change size according the light brightness. The color of a person's iris varies and is determined by the amount and type of pigments such as brown, blue, greens, or hazel. - Fovea centralis: It is responsible for sharp central vision (also called foveal vision), which is necessary in humans for reading, driving and any activity where visual details is primary importance. Sharpest vision occurs here. - Blind spot: No image is formed here because both rod and cone light receptor absent. - Ciliary body: It helps to hold the lens in position.
285010
In mammalian eye, the 'fovea' is the center of the visual field, where
1 More rods than cones are found
2 High density of cones occur, but has no rods
3 The optic nerve leaves the eye
4 Only rods are present
Explanation:
B The fovea centralis is located in the center of the macula lutea, a small, that spot located exactly in the center of posterior portion of the retina. Fovea has highest visual activity which has only cone cells and no rod cell. Fovea is responsible for high activity vision. It is densely saturated with cone photoreceptors. To form high resolution images, the light must fall on the fovea and that limits the acute vision angle to about 15 degree. In low light, this fovea constitutes a second blind spot since it's cones do not function in low/dim light.
AIPMT (Re-Exam)-2015
Neural Control and Coordination
285014
Parts \(A, B, C\) and \(D\) of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics:-
1 D- Choroid - its anterior part forms ciliary body
2 A - Retina - contains photo receptors-rods and cones
3 B - Blind spot - has only a few rods and cones
4 \(\mathrm{C}\) - Aqueous chamber-reflects the light which does not pass through the lens
Explanation:
B In the given diagram, A is retina. Retina is innermost layer of eye. It contain three layers of neural cell from inside to outside-ganglion cell, biopolar cell and photoreceptor cell. There are two type of photo receptor cell, namely, rods and cones. These cells contain the light sensitive proteins called photopigment. The rods contain a purplish-red protein called the rhodopsin, which contain a derivative of vitamin A. The daylight (Photopic) vision and colour vision are function of cones.
NEET-2013
Neural Control and Coordination
285020
Examine the diagram of the two cell types \(A\) and \(B\) given below and select the correct option
1 Cell \(\mathrm{A}\) is the rod cell found evenly all over retina
2 Cell A is the cone cell more concentrated in the fovea centralis
3 Cell B is concerned with colour vision in bright light
4 Cell A is sensitive to low light intensities
Explanation:
B The fovea centralis is the central region of retina in the human eye that contains high concentration of cone cells. Cone cell are photoreceptor cell responsible for colour vision. The concentration of cone is higher in center region in compared to the peripheral region, which allows for vision in the central field of view.
AIIMS-2006
Neural Control and Coordination
285023
Which of the following is true for the function of labelled parts in the diagram below?
1 A- Blind spot - Image is formed here
2 B- Fovea - No visual activity is present
3 C- Cornea - helps to hold lens in place
4 D- Iris - Visible coloured portion of eye
Explanation:
D Only (d) one is a correct answer. In the given diagram (d) is a correctly labeled function here. The iris is the colored part of the eye that surrounds the pupil. It is a thin, circular structure with a central opening (the pupil) that can change size according the light brightness. The color of a person's iris varies and is determined by the amount and type of pigments such as brown, blue, greens, or hazel. - Fovea centralis: It is responsible for sharp central vision (also called foveal vision), which is necessary in humans for reading, driving and any activity where visual details is primary importance. Sharpest vision occurs here. - Blind spot: No image is formed here because both rod and cone light receptor absent. - Ciliary body: It helps to hold the lens in position.
