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Neural Control and Coordination Test - 68

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Neural Control and Coordination Test - 68
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  • Question 1
    1 / -0
    The visual unit of a compound eye of an insect is
    Solution
    The compound eyes of arthropods are composed of units called as ommatidia. An ommatidium contains a cluster of photoreceptor cells surrounded by support cells and pigment cells.
  • Question 2
    1 / -0
    Name the part of the brain that coordinates the voluntary movements.
    Solution
    The cerebrum refers to the parts of the brain containing the cerebral cortex (of the two cerebral hemispheres), as well as several subcortical structures, including the hippocampus, basal ganglia and olfactory bulb. Cerebrum is the thinking part of the brain but also controls the voluntary movements of the body.
  • Question 3
    1 / -0
    Meibomian glands are associated with
    Solution
    The meibomian glands (or tarsal glands) are a special kind of sebaceous gland at the rim of the eyelids inside the tarsal plate, responsible for the supply of meibum, an oily substance that prevents evaporation of the eye's tear film.
  • Question 4
    1 / -0
    Which one of the following is the correct difference between rod cells and cone cells of our retina?
      Rod cellsCone cells
     aVisual acuityHighLow 
     bVisual pigmentIodopsinRhodopsin 
     cOverall functionVision in poor light Colour vision and detailed vision in bright light
     dDistributionMore concentrated in centre of retinaEvenly distributed all over retina
    Solution
    The retina contains the cells, that respond to light. These specialized cells are called as photoreceptors. There are 2 types of photoreceptors in the retina: rods and cones. 
    The rods are most sensitive to light and dark changes, shape and movement and contain only one type of light-sensitive pigment. 
    Cones are most sensitive to one of three different colours (green, red or blue). Signals from the cones are sent to the brain, which then translates these messages into the perception of colour. Cones work only in bright light. 
  • Question 5
    1 / -0
    Small, solid and four optic lobes or colliculus called as corpora quadrigemina are found in 
    Solution
    The corpora quadrigemina in mammals are four solid lobes on the dorsal side of the cerebral aqueduct, where the superior posterior pair are called as the superior colliculi and the inferior posterior pair is called the inferior colliculi. The four solid lobes help to decussate several fibres of the optic nerve. The optic lobes or corpora bigemina of fishes, batrachians and birds are structurally homologous with the corpora quadrigemina of mammals.
  • Question 6
    1 / -0
    Eyes of cats glitter at night due to presence of
    Solution
    The tapetum cellulosum is modified choroid and consists of iridocytes. It serves to reflect blue, green and yellow light from the fundus of the eye which in turn gives the glittery appearance to cat eyes at night. 
    Tapetum fibrosum is characteristic of ungulates and has organized collagen bundles. 
    Porphyropsin is the retinal pigment of freshwater fishes. 
    Luciferin is pigment found in luminescent algae and causes light production in fire algae.
    So, the correct answer is option B.
  • Question 7
    1 / -0
    Pigmented dendritic cells occur in
    Solution
    Epidermis is the outer part of skin, which is keratinised and composed of stratified squamous epithelium layers. In the structure of epidermis on the basis of shape of cells and cytoplasm, there are five stratum -
    (1) Stratum Malpighii
    (2) Stratum spinosum
    (3) Stratum granulosum
    (4) Stratum lucidum
    (5) Stratum corneum
    An innermost stratum of epidermis consisting of one layer of cells is called as stratum Malpighii. It is also called as stratum basale. Cells are cubical or columnar in shape. In this stratum two types of cells are present.
    (i) Melanocytes - They are called pigmented dendritic cell. These cells are formed by modification of cell which lies at the junction of epidermis and dermis. 
    (ii) Keratinocytes - They get their nutrition from underlying connective tissue of dermis and divide to form another stratum of the epidermis.
  • Question 8
    1 / -0
    Name of the nervous band connecting cerebral hemisphere in rabbit is
    Solution
    Corpus callosum is a broad band of nerve fibres joining the two cerebral hemispheres of the brain in mammals. It is the largest white matter structure in the brain, consisting of 200–250 million contralateral axonal projections. Hence, option A is correct.
  • Question 9
    1 / -0
    The size of pupil is controlled by the
    Solution
    The pupil is the opening in the centre of the iris. The size of the pupil determines the amount of light that enters the eye. The circumferential sphincter muscle found in the margin of the iris, innervated by the parasympathetic nervous system: and the iris dilator muscle, running radially from the iris root to the peripheral border of the sphincter. control the pupil size.
  • Question 10
    1 / -0
    Identify the correct sequence of organs/regions in the organization to human ear as an auditory mechanoreceptor organ.
    Solution
    Sound waves enter the external auditory canal and cause the tympanic membrane to vibrate. These vibrations are amplified by ear ossicles (malleus, incus, and stapes) and are transmitted through oval window to basilar membrane. Vibrations of basilar membrane stimulate the hair cells (mechanoreceptors) of the organ of Corti of cochlea and nerve impulse is carried to the brain by the auditory nerve. Thus, the correct answer is option E.
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