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Neural Control and Coordination Test - 74

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Neural Control and Coordination Test - 74
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Two halves of the cerebrum are connected through
    Solution
    Cerebrum is the largest part of the brain. It is divided into two halves right and left cerebrum. The two part of the cerebrum is connect by corpus callosum. The posterior end of the corpus callosum, near to the cerebellum, is called the splenium. The anterior end is near to frontal lobe is known as genu. It helps in relay of information from right cerebrum to the left.
    So, the correct answer is option C.

  • Question 2
    1 / -0
    Guanine pigment is present in
    Solution
    The tapetum lucidum is a layer of tissue in the eye of many vertebrates. Lying immediately behind the retina it reflects visible light back through the retina, increasing the light available to the photoreceptors. The tapetum lucidum contributes to the superior night vision of some animals. Many of these animals are nocturnal, especially carnivores that hunt their prey at night, while others are deep sea animals. Choroidal guanine tapetum is seen in Elasmobranchii (skates, rays, and sharks) and chimaeras. The tapetum is a palisade of cells containing stacks of flat hexagonal crystals of guanine.
  • Question 3
    1 / -0
    The sound vibrations are finally exhausted in
    Solution
    The middle ear is separated from the internal ear by a bony septum known as fenestra rotundus or round membrane. It connects middle ear to internal ear. The stapes bone transmits movement to the oval window. As the stapes footplate moves into the oval window, the round window membrane moves out, and this allows movement of the fluid within the cochlea, leading to movement of the cochlear inner hair cells and thus hearing. If the round window were to be absent or rigidly fixed (as can happen in some congenital abnormalities), the stapes footplate would be pushing incompressible fluid against the unyielding walls of the cochlea. It would therefore not move to any useful degree leading to a hearing loss of about 60dB. 
    Therefore, the correct answer is option B.
  • Question 4
    1 / -0
    In frog, eyelids are 
    Solution
    Frogs use their regular set of eyelids to keep their eyes moist and clean. They have a bottom lid that stays still and an upper lid that blinks. Frogs also have a third eyelid that serves a different purpose. This one, called as the nictitating membrane, is a semitransparent lid that covers the eye completely, helping the frog see underwater and hide from predators. 
    So, the correct answer is option A.
  • Question 5
    1 / -0
    When a person do not have green cones, then the condition is called as
    Solution
    Colour blindness is the inability or decreased the ability to see colour, or perceive colour differences, under normal lighting conditions. The most usual cause is a fault in the development of one or more sets of retinal cones, that perceive colour in light and transmit that information to the optic nerve. 
    Protanopia is a severe type of colour vision deficiency caused by the complete absence of red retinal photoreceptors. 
    Deuteranopia is a colour vision deficiency in which the green retinal photoreceptors are absent, moderately affecting red-green colour discrimination. 
    Tritanopia is a very rare colour vision disturbance in which there are only two cone pigments present and a total absence of blue retinal receptors.
    So, the correct answer is 'Deuteranopes'
  • Question 6
    1 / -0
    Pecten is a comb like structure found in the eyes of 
    Solution
    The pecten or pecten oculi is a comb-like structure of blood vessels, belonging to the choroid in the eye of a bird. It is a non-sensory, pigmented structure that projects into the vitreous body from the point, where the optic nerve enters the eyeball. The pecten nourishes the retina and controls the pH of the vitreous body.
  • Question 7
    1 / -0
    Which of the following in rabbit's eyes is responsible for frictionless blinking?
    Solution
    Meibomian gland are present in the inner surface of the eyelids. They secrete an oily substance which spreads over the cornea and prevents the cornea from drying. These glands prevent the friction between two eyelids. These glands are present in animals like rabbits. They help in frictionless movement and blinking of the eyelids. 
    So, the correct answer is option B. 
  • Question 8
    1 / -0
    In frog, the eyes are
    Solution
    The large round lens of the frog gives the animal a large field of view. The frog is naturally nearsighted (myopic) to -6 diopters giving it a focus of approximately 6 inches. Frogs and toads can change their focus by moving the lens out towards the cornea. 
    In frogs, the focus range is a few diopters and in toads, the focus range is 5 diopters giving the best myopia of -1 diopters. During this accommodation, the pupil also increases in size. The advantage of nearsightedness is that it blurs the background clutter making foreground object characterization much easier. 
    Eyes that are better adapted for terrestrial vision and are emmetropic (i.e., in focus) in the air tend to be hypermetropic (i.e., far-sighted) underwater, while eyes better adapted for aquatic vision and are emmetropic in water will tend to be myopic (i.e., near-sighted) in air. If the retinal image is to remain sharp in both media, the eye must cope with large changes in external refractive indices. The bulging eyes of most frogs allow them to see in front, to the sides, and partially behind them.
  • Question 9
    1 / -0
    In mammals, the middle ear ossicles from inside to outside are in the sequence of
    Solution
    The middle ear begins at the tympanic membrane and ends at a bony wall with two small openings namely oval window and round window. Three small bones present between the tympanic membrane and oval window are collectively referred to as ossicles; these are namely malleus, incus and stapes. The malleus is present towards the outside and adheres to the tympanic membrane while the stapes is in contact with the oval window. 
    Therefore, the correct answer is option A.
  • Question 10
    1 / -0
    Rohit categorized the functions of different lobes of cerebral hemisphere as given in the table below.
    Group AGroup BGroup CGroup A
    Smell, touch, temperature and conscious associationAuditory receptionMuscular activitiesVisual reception
    Which of the following have the correct headings for the given table?
    Solution
    • The cerebral cortex is divided into four sections called lobes. These are parietal lobe, temporal lobe, frontal lobe, and occipital lobe. 
    • The parietal lobe is the region of touch, smell, temperature and consciousness association. 
    • The temporal lobe is the region of auditory reception. The frontal lobe is the region of muscular activities. The occipital lobe is the region of visual perception. 

    Thus, the correct answer is 'Group A: Parietal lobe, Group B: Temporal lobe, Group C: Frontal lobe, Group D: Occipital lobe'.
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