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Neural Control and Coordination Test - 73

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Neural Control and Coordination Test - 73
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  • Question 1
    1 / -0
    The external ears of mammals 
    Solution
    The external ear consists of an external flap (pinna) and auditory canal and is commonly called as pinna. External ears are present in all mammals except monotremes, a feature that links them with birds. Many mammals can move the external ear by its own and associated muscles to capture the maximum amplitude of sound waves and to discriminate between different sources of sound. 
    So, the correct answer is option D.
  • Question 2
    1 / -0
    In the eyes, the image formed on the retina is 
    Solution
    The retina is the thin light-sensitive membrane lining the inner eyeball towards the back of the eye. When the light goes into the eye it must pass through the lens (a biconvex lens), which inverts the image we are seeing. When we look at an image, light bounces it into our eye. As it enters our eye and passes through the lens the image gets inverted- reversed and flipped the other way- so that the image on our retina looks like an upside down object going from right to left instead of left to right. Once this image is set on the retina, cone cells distinguish the colour and detail, while rod cells distinguish movement and shades of grey. 
    The retina is connected to a nerve called the optic nerve- the image gets sent from the optic nerve to the occipital lobe in the brain where the image gets flipped and inverted once again to the proper image of the object we first saw- and is finally interpreted.
  • Question 3
    1 / -0
    A circular canal which is found in the limbus part of the eyes is called as
    Solution
    The limbus is the region, where the cornea transitions to the sclera and also where the cornea meets with the tissue of the iris at the iridocorneal angle. Within the connective tissue of the angle lies a network of endothelial lined channels, which is the trabecular meshwork, and deep to the meshwork within the connective tissue of the sclera is the venous canal of Schlemm. Schlemm's canal is a circular channel in the eye, that collects aqueous humor from the anterior chamber and delivers it into the bloodstream via the anterior ciliary veins. The canal is an endothelium-lined tube, resembling that of a lymphatic vessel. 
    So, the correct answer is option B.
  • Question 4
    1 / -0
    For the synthesis of rhodopsin, which of the following food is needed?
    Solution
    Opsins are the light sensitive proteins of rods. Binding of opsin to retinal (a chromophore) makes rhodopsin which serves as the visual purple pigment of rod cells. Retinol is a form of vitamin A and carrots are a rich sources of vitamin A. So, the correct answer is option C.
  • Question 5
    1 / -0
    The ear ossicles of rabbit lie in the 
    Solution
    The middle ear contains the three ossicles, the malleus (hammer), incus (anvil), and stapes (stirrup). The space in which these bones lie is called as the tympanic cavity and is connected directly to the oral cavity by a hollow tube.
  • Question 6
    1 / -0
    In man, the nictitating membrane is 
    Solution
    The plica semilunaris in humans is a small fold of tissue on the inside corner of the eye. It is the vestigial remnant of the nictitating membrane, an organ that is fully functional in some other species of mammals.
  • Question 7
    1 / -0
    In the rabbits, the muscles which move the pinnae are 
    Solution
    The ears of a rabbit have more developed muscles than those of humans, and therefore rabbits have the capability to move their ears to better hear potential threats. Humans and other primates such as the orangutan and chimpanzee, however, have ear muscles that are minimally developed and non-functional.
  • Question 8
    1 / -0
    The part of rabbit's eye which acts like diaphragm of camera is 
    Solution
    Iris is the part of the eye, which is responsible for one's eye color. It acts like the diaphragm of a camera, dilating and constricting the pupil to allow more or less light into the eye.
    So, the correct answer is option B.
  • Question 9
    1 / -0
    The nictitating membrane of rabbit is 
    Solution
    Nictitating membrane is also called as the third eye of rabbit and is found in medial canthus (inner corner) of an eye. This is swept closed across the eye in the direction from beak to ear to protect the eye as well as to clean and lubricate it with the moisture of lachrymal gland. 
    So, the correct answer is option C.
  • Question 10
    1 / -0
    Between malleus and incus, the joint found is
    Solution
    Incudomalleolar joint is a small synovial hinge joint between the malleus (hammer) and the incus (anvil). The joint's function is to transfer vibrations between the ossicles in the middle ear, which is perceived as sound.
    So, the correct answer is 'Incudomalleolar joint'
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