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Neural Control and Coordination Test - 51

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Neural Control and Coordination Test - 51
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  • Question 1
    1 / -0
    The order of three layers of cells in retina of human eye from inside to outside is
    Solution
    Correct option: C
    Explanation:
    • The retina is the innermost layer of the eye and is responsible for sight.
    • It is connected to the brain with the help of the optic nerve.
    • The outermost layer of cells is the photoreceptor cells that detect light and low light vision.
    • Next to them are the bipolar cells that perceive the signal.
    • Innermost is the ganglionic cells that form the optic nerve and transmit information.
    Hence, the order of three layers of cells in the retina of the human eye from inside to outside is "Ganglion cells, bipolar cells, photoreceptor cells".
  • Question 2
    1 / -0
    The functions of our visceral organs are controlled by?
    Solution
    • The function of our visceral organs is controlled by the sympathetic and parasympathetic nervous system. 
    • Activation of the sympathetic system prepares the body for intense physical activity emergencies and stress. 
    • In this case, the blood is diverted away from the visceral organ and skin.
    • Whereas stimulation of the parasympathetic nerve can result in a slowing of the heart, dilation of visceral blood vessels, and increased activity of the digestive tract.

    So, option B is the correct option.
  • Question 3
    1 / -0
    Which is not a refractive medium of eye?
    Solution
    A. Lens of eye is a crystalline structure in the eye ball which is held in place by ligaments that are attached to ciliary body. It is biconvex in nature and focus the light rays on the retina.
    B. Aqueous humour is a transparent fluid present between cornea and lens.
    C. Vitreous humour is a transparent gel present between lens and retina.
    D. Pupil is the aperture of eye through rays enter the eye.
    Refraction of light occurs when it enters a different medium and its speed gets changed. Pupil is not a refractive medium because it is an aperture or hole through which light is directly passing.
    So, the correct answer is 'Pupil'.
  • Question 4
    1 / -0
    Match the columns.
    III
    $$1$$.FoveaaProvides opening for entry of light
    $$2$$.IrisbTransduces RBG fight
    $$3$$.PupilcTransmits information to CNS
    $$4$$.LensdControls amount of light entering
    $$5$$.Optic NerveeFocus light on retina
    Solution
    1. Fovea is the central cavity of macula lutea, a yellow pigmented spot in eye present laterally to blind spot. Visual resolution is maximum at fovea because it contains only cones, the photoreceptor cells associated with colour vision and daylight vision. Fovea is sensitive to the wavelengths of red, green and blue lights and detection of these colours by fovea is explained by RBG fight or RBG theory where RBG means red. green and blue.
    2. Iris is a opaque and pigmented structure in eye. It is visible as coloured portion. It regulates the amount of light entering the eye by controlling the size of pupil.
    3. Pupil is an aperture or opening in the eye through which light rays enter the eye.
    4. Lens is the crystalline structure in eye ball which is biconvex in nature and focus the light rays on the retina.
    5. Optic nerve carries visual information to CNS (central nervous system).
    So, the correct answer is '1−b,2−d,3−a,4−e,5−c'.
  • Question 5
    1 / -0
    Retina has
    Solution
    The retina of eye has two types of photoreceptor cells: rods and cones.
    • Rods are the photoreceptor cells that contain rhodopsin pigment and associated with scotopic vision of eye i.e. vision under low light.
    • Cones are the photoreceptor cells that contain iodopsin, porpyrosin and cyanopsin pigments. These cells are associated with the daylight vision and colour vision of eyes.
    Apart from these photoreceptor cells, retina also contains ganglion cells. These are nerve cells that transmit visual information to the brain and are known as neuroganglion cells.
    So, the correct answer is 'Rods, cones and neuroganglion cells'.
  • Question 6
    1 / -0
    Language centres of the brain are located in
    Solution
    • The language centres (Broca's area and Wernicke's area) is a region located in the brain which is responsible for processing and production of speech.
    1) Broca's gyrus is an area situated in the lower part of the left inferior frontal lobe of the brain.
    • It is responsible for the production of words and speech and hence, helps in language processing and the ability to talk.
    2) Wernicke's area is a region located in the temporal lobe on the left side of the brain and is responsible for the comprehension of speech.
    So, the correct answer is 'Left part of cerebrum'.
  • Question 7
    1 / -0
    Comprehension of spoken and written words is carried out in the cerebrum in the region of
    Solution
    A. Broca's gyrus is a region present in the frontal lobe of the left hemisphere and helps in speech production.
    B. Wernicke's area is a region located in the temporal lobe on the left side of the brain and is responsible for the comprehension of speech.
    C. The somesthetic area is an area present in the postcentral gyrus of the parietal lobes and is responsible for the sense of touch, sense of position and movement and haptic perception.
    D. Association area is an area in the cerebral cortex and is responsible for mental functions and to detect the sensory stimulation.
    So, the correct answer is 'Wernicke's area'.
  • Question 8
    1 / -0
    What is fovea centralis?
    Solution
    Fovea centralis is the middle shallow depression of retina. It has only cone cells and is the place of most distinct vision. Thus the correct answer is option D.

  • Question 9
    1 / -0
    Which part of lens in human eye is helpful in adjustment of focal length?
    Solution
    The ciliary body is the structure in the eye that releases a transparent liquid (called the aqueous humour) within the eye. The ciliary body also contains the ciliary muscle, which changes the shape of the lens when your eyes focus on something. This process is called accommodation.
  • Question 10
    1 / -0
    Some persons have an innate sense of direction. It is due to magnetic sensitivity of
    Solution
    •  Humans possess a tiny, shiny crystal of magnetite in the ethmoid bone, located between your eyes, just behind the nose.
    •  Magnetite is a magnetic mineral also possessed by homing pigeons, migratory salmon, dolphins, honeybees, and bats is a tiny compass needle, allowing them to orient themselves in the earth's magnetic field and swim down to their happy home in the mud. Hence, Some persons have an innate sense of direction. It is due to the magnetic sensitivity of the Nose.
    So, the correct answer is 'Nose'.
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